TW446761B - A steel sheet for electrogalvanization and an electrogalvanized steel sheet with excellent black mark resistance, and a method for manufacturing them - Google Patents

Abstract

Providing a steel sheet for electrogalvanization with excellent surface properties such as good black mark resistance. A steel sheet for electrogalvanization with great black mark resistance, wherein the Ni content in the steel sheet is regulated to 0.06 % or less, and wherein the Ni concentration in the surface layer of the steel sheet is 10 atomic % or less and the Ni concentration at a depth of 200 angstrom from the surface of the steel sheet is 4 atomic % or less.

Description

The five instructions (1) The present invention is related to-a kind of steel sheet for electroplating-a kind of galvanized steel sheet with good surface properties containing a small amount of blackening and a-higher The method of manufacturing these steel plates with inefficiency 9 Previous technology Due to the electroplated steel plate, it can produce a beautiful and uniform appearance V This steel plate has been widely used in a variety of fields »including exterior panels or building materials for automobiles and household appliances And recently used as a base for electronic and electrical products and as a casing for computers. Due to the expansion of FifJW for this application »there is a great need to improve the surface properties and appearance of galvanized steel sheets. 9 Specifically, the stains formed on the surface of galvanized steel sheets include Blackened ctst with white line and so on more specifically 9 in electroplating Before the process, almost no blackening was seen in the cold-rolled steel sheet. However, after the electroplating process, significant blackening was first observed. Therefore, there were various countermeasures to try to solve these problems. The method of blackening is, for example, Japanese Patent Publication No. Sh 0 7--2 6 3 5 4-a method for producing--a method of electroplating tin 9 can prevent wood grain form tsj on the surface of electroplating tin (Wood grain ΓΒΊ pattern) appearance ί and can improve the gloss of the surface 9 This method includes CJH electroplating tin on a flowing molten surface during the process of adding-* surfactants to a flux * to enhance the effect of scour Prevents any wood grain pattern from occurring 0 However 9 By adjusting the routine flow melting process during the production process of electroplating tin, this method applicable to electroplating tin is achieved The Q of the giant is therefore 1 whether the method can be effectively applied to a paper used to produce the surface u. The paper size applies the Chinese National Standard (CNS) Λ4 specification (210X297).

-4-44676 1 Α7 Α7 Β7 V. Description of the Invention (2) A method of electroplated steel plate (which is produced by a different type of electroplating process and does not necessarily require a reflow process) is not obvious. In addition, 尙 does not disclose any method for preventing the formation of blackening in a generated electroplated steel sheet without a reflow process. Questions to be Solved by the Invention With the focus on these situations, the invention of the present case has been achieved. An object of the present invention is to provide a steel sheet for electroplating and an electroplated steel sheet having surface properties with good blackening resistance, and a method for manufacturing these steel sheets at a high efficiency. Means of dissolving acetylene printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the notes on the back of the page *. Note ^ 'Written copy 10 The content of Ni is limited to not more than 0.06%; at the same time, the Ni concentration in the surface layer of the steel sheet is 10% by atomic percentage or less, and the Ni concentration at a depth of 200 Angstroms below the steel sheet surface is 4% atomic percent or less. Preferably, the Ni content in the steel sheet is 0.03% or less. The plated steel sheet satisfying the purpose of the present invention * is produced by electroplating the above-mentioned steel sheet for electroplating. An electroplated steel sheet produced by sequentially preparing a chromate film and a clean resin film on the surface of the plating layer is a preferred embodiment of the present invention. A steel sheet for electroplating and the electroplated steel sheet, It can be better used as the outer board material of electrical products and the like. The paper scale is applicable to the Chinese national standard {CNS> A4 specification (2Ι〇 × 297). A7 B7 '446 76 1 V. Description of the invention (3) In addition, Used to make a satisfying hair The purpose of the method for electroplated steel sheet is summarized as follows: using a steel whose Ni content is limited to not more than 0.06% * the surface temperature of the pressed steel during hot rolling is 1 2 0 0 ΐ or lower, while adjusting The reheating temperature of the slab is from 1 50 0 ° C to 1 2 0 0 ° C * The Ni concentration of the surface layer of the steel plate used for the plating is 10% atomic percent or less, and 2 0 below the surface of the steel plate The Ni concentration in Angstrom is 4% by atomic percent or less. Here, preferably, the Ni content in the steel sheet is 0.03% or less. The content of elements other than Ni in the steel material used in the above method Are: C'〇. 10%, SiS0.2% 'M η ^ 1.8%' P ^ 〇. 10%, 0.005 to 0.1% of ΑΙ, and NSO. 010%. If necessary, It is recommended to meet the following requirements; 0.005 to 0.1% Ti and / or 0.005 to

0.1% Nb, and 0.0005 to 0.003% B of the plated steel sheet of the present invention can be manufactured by electroplating the steel sheet for electroammonium produced as described above. Operation of the present invention In the following description, in order to clearly distinguish between a steel plate used for electroplating and a plated steel plate, the steel plate used for electroplating may be referred to as "the original plate in electroplating". The inventors have explored why blackening is formed in electroplated steel sheets. As a result, the inventors have found that the concentration of Ni is larger in the portion where blackening is observed than in the normal portion where blackening is not observed. In addition, the inventors have expected that the paper size applicable to the Chinese national standard (CNS > M specification (21〇 π7 public epidemic)) {Please read the precautions on the back before filling this page) _ Order Central Bureau of Standards, Ministry of Economy Printed by employee consumption cooperation Du printed 446761 A7 B7 Printed by employee consumption cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of invention (4) The generation of blacks can only be effectively avoided if the concentration of such Ni is adjusted. The inventors have performed supplementary experiments focusing on the composition of the steel and the conditions used to make a steel plate before an electroplating process. Therefore • The present invention has been completed * According to the background of the experiment, the structure of the present invention will be explained. Five treasures of steel containing chemical composition have been tested, that is, 0.05% C, 0.010% Si, 0.20% Mn, 0.015% P, 0.015% S, 0.045% A, 0.060% N, and various + Ni contents ranging from 0.004 to 0.10%. These steels were melted on a laboratory scale and rough rolled into 30 mm thick slabs. The slab is heated to a temperature range of 1 0 5 0_ 1 3 0 0 ° C and is hot rolled to a processing temperature of 920 ° C and a thickness of 3.6 mm. Subsequently, the obtained product was subjected to a coiling process and a dipping process to prepare a hot-rolled steel sheet, and then cold-rolled to prepare a cold-rolled steel sheet having a thickness of 0.8 mm. These prepared cold-rolled steel sheets were subjected to an annealing process in a soaking box at 650 ° C for 20 hours, and then subjected to 0.5% temper rolling, and then electroplated in a sulfate bath and subsequently subjected to The chromating process and the organic resin coating process to prepare an electroplated steel sheet having an electroplating deposition degree of 20/20 g / m2. The estimated values of blackening on the surface of the electroplated steel sheet are as follows. More specifically, as a sample for estimating the blackening, six samples having a cut size of 100 mm wide and 180 mm long were prepared from the cold-rolled steel sheet produced by the above process. These samples were subjected to the same plating process as described above to prepare a plated steel sheet. Surface area of each sample This paper size applies Chinese National Standard (CNS) Λ4 specification (2 丨 0X 297 mm) (please 4-read the note on the back of the greedy $ item ^ write this page} " binding-order 7 A7 B7 446761 V. Description of the invention (5) {Please read the notes on the back before filling in this page) It is divided into 10 equal sections, and each of the ten sections (a total of 60 sections) is formed. The blackening number is counted, and the blackening frequency is calculated by the following formula: Blackening frequency (%) = (total blackening / 60) x l00 Figure 1 shows that the reheating temperature of the slab is fixed at 1 150 ° C. , The relationship between the frequency of blackening in a steel plate and the children with Ni. As clearly shown in FIG. 1, the blackening frequency decreases as the Ni content decreases, so that the content of 0.06% or less Ni can make the blackening frequency reach 10% or less as a display resistance. Darkening improved mark. Figure 2 shows the relationship between the blackening frequency and the slab reheating temperature when the Ni content is fixedly preset to 0.012%. As clearly shown in Figure 2, the blackening frequency decreases as the slab reheating temperature decreases, so that the slab reheating temperature of 1 2 ο οτ or lower enables the blackening frequency to reach 10% or less * these The results of the experiment indicate a method for adjusting the Ni content to the original plate in electroplating printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs to print 0.06% or less (which is adjusted to Γ 2 0 0. (: Hot rolling at a reheating temperature of slab or lower) can be effectively used to produce an electroplated steel plate with good blackening resistance ° Then, examine the depth between the surface of the original plate and the Ni content in an electroplating More specifically, by using a steel material having a Ni content of 0.05%, one of the plated steel plates produced in the same manner as described above has a blackened portion and a plated portion without a blackened portion. Layer 'borrowed one __________ ^ --------—— This paper size applies to China National Standard (CNS) A4 specification (210 × 297 mm) -8 446761 Printed by the Consumers Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 Five 'invention description (6) alkaline solutions (10% Na Na Ο aqueous solution at 60 ° C), peeled to prepare an original plate (in an exposed state) in a non-electroplated plate, and then the depth under the surface was analyzed by Auger Analyze. Figure 3 shows the Ni concentration curve. • The graphical representation of the Ni concentration at the next depth of the original plate surface in the electroplating. This figure indicates that the occurrence of blackening and the concentration curve of Ni concentration in the surface layer of the steel plate have Higher correlation: A large amount of blackening is formed in a steel plate with a higher concentration * and almost no blackening is formed in a steel plate with a lower concentration. Furthermore, a normal portion where no blackening occurs , The Ni concentration displayed on the surface of the original plate in the electroplating at a specified depth is uniformly 4% atomic percent or less. In other words, the Ni concentration in a certain depth of the original plate in an electroplating is adjusted within a specified range, Effectively used as a steel plate for electroplating with good blackening resistance. In order to examine the relationship between the concentration of Ni in the surface layer of the original plate and the surface of the plated surface during electroplating, and to examine the concentration of Ni is 4 The relationship between depth and plating appearance at% atomic percent or less, a very large number of samples are used for depth analysis. Figure 4 shows the relationship between the Ni concentration in the surface layer of the original plate during plating and the appearance of the plating surface. Figure 5 shows the relationship between the depth at a Ni concentration of 4% or less and the plating outer shell. Visually observe these patterns (mainly blackened) on the plating surface, and the appearance of these plating surfaces Estimated with the following criteria: 〇: electroplated surface in good condition △: more or less patterns are observed on the electroplated surface X: obvious patterns are observed on the electroplated surface The paper dimensions are applicable to the Chinese national standard ( CNS) Λ4 specification (210X 297 mm) (Please read the note on the back before writing this page)

-9-446761 A7 ____B7_ 5. Description of the invention (7) These results indicate that if the Ni concentration in the surface layer of the original plate in the electroplating is 10% atomic percent or less, and the surface of the steel plate is 200 angstroms The Ni concentration at the depth of 4% by atomic percent or less can produce an electroplated steel sheet having good surface properties that hardly cause any blackening. It is also pointed out that the original plate in electroplating whose Ni concentration is adjusted in the above manner can be produced only by limiting the Ni content in the steel plate and the slab reheating temperature during hot rolling. In order to confirm the results of these experiments, experiments were performed in the same manner as described above by using another steel material (a Ti-added steel material). Five kinds of steels containing chemical composition are used, that is, 0.003% C, 0.01% Si, 0.15% Mη, 0.007% P, 0.010% S, and 0.035% A1 With 0.00025% N, 0. 065 Ti, and various Ni contents between 0.004 and 0.10%. Printed by the Xiaoxian Cooperative of the Central Government Bureau of the Ministry of Economic Affairs. I. 1 I Λ--ί.. Ml I., Guang: Yi (please read the precautions on the back before filling this page) These types of steel After being melted on a laboratory scale, the melted product was hot-rolled in the same manner as described above, and then processed to a final thickness of 3.6 mm at a processing temperature of 920 ° C. Then, the final product was subjected to a coiling process at 65 ° C for one hour before the dipping process to prepare a hot-rolled steel sheet, and then cold-rolled to prepare a cold-rolled steel sheet having a thickness of 0.8 mm. These prepared cold-rolled steel sheets were subjected to a continuous annealing process at 800 ° C for one minute, and 0.5% temper rolling, and then electroplated in a sulfate bath, and then subjected to a chromating process and Organic resin coating process, this paper size applies Chinese solid standard (CNS) Λ4 specification (210X 297) while 446761 A7 B7 is printed by the staff of the Central Standards Bureau of the Ministry of Economic Affairs. 5. Description of invention (8) to prepare electroplating Electroplated steel sheet with a deposition degree of 20 / 2.0 g / m2.9 The estimated value of blackening on the surface of each electroplated steel sheet is as described above. Fig. 6 shows the condition that the reheating temperature of the billet is fixed at 1 150 ° C. Below, the relationship between the blackening frequency and the Ni content in the steel sheet is as shown in FIG. 6, which shows that the Ni content of J 0 0 6% or less enables the blackening frequency to reach 10% or less > As a mark showing improvement in blackening resistance, FIG. 7 shows that when the Ni content is fixedly preset to 0 0 1 2%, the blackening frequency and [ϊΐ m blank reheating The relationship between temperature 0 As clearly shown in Figure 7, the GET f? Rt frequency decreases by 1 as the slab reheating temperature decreases, so that the slab reheating temperature of 1 2 0 ° 0 or lower enables The blackening frequency reached a level of 10% or less. The results of these experiments were the same as above. It was confirmed that _ ~ · kinds of original plates in electroplating that adjusted the Ni content to 0.6% or less ( It is hot-rolled at a slab reheating temperature adjusted to 12 0 ° C or lower.) It can be effectively used to produce a plated Am steel plate with good blackening resistance. Then, a raw plate in plating The relationship between the depth under the surface and the Ni content is examined in the same way as above except that the steel with the Ni content specified as 0.01% is used. Circle 8 shows the Ni concentration curve as The way of drawing is inserted in the electric Λ | Ατ mine Figure 9 shows the Ni concentration at the depth below the surface of the original plate. Figure 9 shows the relationship between the Ni concentration in the surface layer of the original plate during plating and the appearance of the plated surface; and Figure 10 shows the atomic percentage or The relationship between the depth and the appearance of the surface when they are less. These results are the same as the experimental results described above. More specifically, they indicate: • Read the back side of the note. The paper size applies the Chinese National Standard (CNS) Λ4 specification (210X297). %)

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..X -11 446761 A7 B7 V. Description of the invention (9): If the Ni concentration in the surface layer of the original plate in the electroplating is 10% atomic percentage or less, and the steel surface is 2 0 angstroms The Ni concentration at the depth of 4% by atomic percent or less can produce a plated steel sheet having good surface properties that hardly cause any blackening. The structure of the present invention has been determined based on the experimental results described above. With this structure, it is possible to adjust the Ni concentration layer having an adverse effect such as the generation of blackening.尙 Wei Weiming Why the adjustment of the Ni-containing children in the steel sheet and the adjustment of the reheating temperature of the slab used for hot rolling can improve the blackening resistance ', but the following reasons can be proposed. Oxidation of steel increases the thickness of rust scale. Among these steel components, elements that can be easily oxidized, such as Si, Mn, and Fe, react with oxygen to form a skinned layer. In addition, the non-easily oxidized N 丨 is maintained in the steel | so that Ni is concentrated in an amount equivalent to the scale to form a concentrated portion of Ni. Compared with a part without Ni concentration, because the formed Ni concentrated portion is less susceptible to oxidation, the state of the interface between the scale and the steel is corrected from a smooth state before hot rolling to a non-uniform The state of "compositing with" is called "mixed layer". Since the concentrated Ni portion is not dissolved by the dipping process and is maintained on the surface, by using a steel material having a mixed layer formed thereon, it is sequentially subjected to hot rolling, dipping, cold rolling, and annealing process plating The surface of the original plate is in a state 'where viewed in plan' forms a wood grain pattern with a non-uniformly distributed Ni concentration in the rolling direction. When the steel plate in this surface state is electroplated, the standard of the N i concentrated part and the non-collected paper is the common Chinese National Standard (CNS) Λ4 specification (2! OX 297 mm) — i pack 11 order J \ .. ' J .. · X (please read the notes on the back before filling out this page)-Central Bureau of Standards, Ministry of Economic Affairs 1¾: Printed by the Industrial and Consumer Cooperatives -12-44676 1 at Β7 V. Part of the description of the invention (10) The difference in electrolytic potential energy between the electroplated crystals deposited on the surface and the growth direction of the electroplated crystals was observed as a kind of blackening on the electroplated surface. According to the present invention, the reduction of the Ni content in the steel material suppresses the formation of a concentrated Ni content *, and the slab reheating temperature for hot rolling is adjusted to a lower temperature to suppress the Ni concentration range. As a result, it is possible to manufacture an electroplated steel sheet having good blackening resistance. As described above, the first feature of the present invention is a master plate in electroplating having a regulated Ni content. More specifically, the electroplating The Ni content in the steel of the original plate should be 0.06% or less * preferably 0.03% or less, and more preferably 0.02% or less. Furthermore, the second feature of the present invention is a raw plate in electroplating, wherein the Ni concentration in the surface layer of the raw plate in the electroplating is 10% atomic percent or less (preferably 8% atomic percent). Or less), and the Ni concentration at a depth of 200 Angstroms below the surface of the steel plate is 4% atomic percent or less (preferably 3% atomic percent or less). In order to manufacture the original plate in electroplating that satisfies the above-mentioned needs of the present invention, a steel material having a pre-adjusted Ni content, or a waste alloy, or the like may be used. In either case, the N_i content in a raw steel material can be adjusted within the aforementioned satisfactory range. Furthermore, in terms of hot rolling, the surface temperature of the steel should be adjusted to 120 ° C or lower. • The slab reheating temperature should be adjusted to 1050 to 1 200 r. Preferably, the upper limit is 1 1 50 ΐ. Alternatively, the lower slab reheating temperature can effectively improve the blackening resistance. The paper size is applicable to the Chinese National Standard (CNS) Λ4 specification (210X297 mm) (Please read the precautions on the back before writing this note 肓) t Printed by the Consumers Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs -13-446761 A7 B7 V. Description of the invention (11) However, if the temperature is too low, hot rolling becomes difficult. Therefore, the lower limit is 1050 ° C »Preferably, the lower limit is 1080 ° C * Please read the notes on the back first and then fill out this page. As mentioned above, the better Ni content in steel is the same as that during hot rolling. The slab reheat temperature has a high correlation: for example, when using a steel whose Ni content is adjusted to 0.030% or less, the slab reheat temperature should be adjusted to 1 1 3 0 to 1 2 0 0 ° C (preferably 1140 to 1190); for example, when using a steel with a Ni content of 0.03 1 to 0.060%, the slab reheating temperature should be adjusted to 1050 to 1 190 ° C (Preferably 1080 to 1160 eC). By subjecting the prepared original plate in the electroplating to electroplated ammonium, it is possible to manufacture an electroplated steel sheet having good blackening resistance according to the present invention. The basic construction requirements of the present invention have been described above. Preferred requirements for improving formability or the like will be described below. In the composition of the steel material used according to the present invention, the preferred content of elements other than Ni is as follows. "10% C (carbon) printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs was added excessively to a raw plate in electroplating, resulting in excess. Cementite, increase its yield point and strength 'and reduce its formability (especially press formability). In addition, the amount of Ti and Mb should increase as the C content increases (described below) ', which causes an increase in production costs. Therefore, the upper limit should preferably be 0.10%. More preferably, the paper size of the upper limit should be in accordance with the Chinese national standard {CNS} 4 specification (2 丨 〇 < 297 public box :) 4 4 6 7 6 1 A7 B7 V. Description of the invention (12) should be 0 · 〇〇6%. In contrast, the lower limit is not limited, however, the reduction of the C content involves the degassing process during the melting of the steel. Due to the significant increase in cost involved in adjusting the c content to less than 0.005%, the lower limit should preferably be 0.05%. S i ^ 0. 2 96 S i is a useful element which can obtain a higher strength without compromising ductility. However, if the amount of Si added is more than 0.2%, the performance of being subjected to electroplating and phosphating may be deteriorated. Therefore, the upper limit should be 0.2%. Especially for mild steel, an Si content of less than 0.2% should be used. Μ η ^ 1.8% Printed by the Shellfish Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs Μ η is a useful element that can be obtained—higher strength ’without compromising the effectiveness of plating and phosphating. Depending on the required strength, Mη may be added to 1.8%. Especially for soft steel plates requiring higher formability, an Mη content of 0.20% or less should be more satisfactory. P ^ 0. 10% Same as the case of Si and Μη. "P is a useful element." The paper can be scaled to the general Chinese National Standard (CNS). Λ4 specification (210X 297 mm). A7 B7 4 46 761 V. Description of the invention (13) (Please read the notes on the back before filling this page) to get a higher intensity. Excessive addition of p causes embrittlement and affects press formability. Therefore, the upper limit should preferably be 0.10%. Especially for soft steel plates, the P content should preferably be less than 0.020% and more preferably less than 0.015%. A1: 0.005 to 0.10% As a reducing agent, A i is a useful element, and its addition amount should preferably be 0.005% or more in order to use this A1 effect to reduce the content of steel Oxygen level. However, excessive addition is useless' because the effect reaches saturation. In addition, the oxide content can be increased to reduce cleanliness, which results in a reduction in elongation and press formability. Therefore, the upper limit should be 0.10%. N ^ O. 010% Ministry of Economic Affairs _ Central Standardization Bureau Employees' Consumer Cooperatives Printed by excessive addition of N caused aging, which involves the occurrence of surface deterioration called "tensile strain" during stamping, so the upper limit should preferably be 0.010 %. When T i and Nb are added to this steel to fix N, the upper limit should preferably be 0.050% 'in order to increase the production of these elements' to save costs. In addition to the above-mentioned elements, other satisfactory elements can be added if necessary. This paper size applies the Chinese National Standard (CNS) Λ4 present grid (210 × 2 <? 7mm) 44676 1 Α7 Β7 V. Description of the invention (14)

Ti: 0.005 to 0 1% and / or ^ 41 ^: 0. 005 to 0.1% (Please read the notes on the back before filling this page) These elements help to fix C and N in steel Improvement of stamping formability: When it is less than 0.005%, this effect cannot be effectively displayed, and thus operability and aging are deteriorated. Therefore, the lower limit should preferably be 0.005%. Differently, when the added amount exceeds 0.1%, the effect will be saturated, which will only increase the cost. B: 0.005 to 0.003% B (boron) is a useful element that effectively prevents cracking (cold working embrittlement) during stamping and reworking. In order to effectively use this effect, the added amount is preferably 0.005% or more. Since the effect is easy to reach the saturation level, it is not economical (because of the increase in cost) when the added amount exceeds 0.003%. Therefore, the upper limit should preferably be 0.0 0 3%. Printed by the Ministry of Economic Affairs and the Central Bureau of Standards, Xiaoxian Cooperative, if necessary, one or two or more C Γ, Ca and Cu elements can be added, as long as these elements are maintained at CrSO. 10%, Ca ^ 0. 0 10% ≪: 11% within the range of 0.5%, it will not affect the appearance and formability of the plating. In order to manufacture a raw plate in electroplating using a steel material having the above-mentioned preferred chemical composition, preferred requirements are described below. As the steel material to be used in the present invention, a continuous paper size can be used to apply the Chinese National Standard (CNS). Λ4 is present (2 丨 〇297297 feed) • One π — A7 / 146761 __B7____ V. Description of the invention (is) Steel, or those derived from hot direct rolling, hot-feed rolling, are derived from cold slabs or the like. (Please read back & -Notes again 4: Write a tile) The processing temperature of hot rolling should be equal to or above A r3 point; and in order to obtain better formability, it is recommended that the temperature just exceed A r 3 * The cooling rate to the coil should preferably be 30 ° C / sec or higher. In order to improve the formability, it is recommended that the cooling rate exceed 70 ° C / s e c. The coiling temperature should preferably be in the range of 500 to 750 ° C. If necessary, the coiled coil is immersed, tempered, and cold rolled, preferably at 50% or more. Thereafter, the obtained coil is annealed. The annealing process may be performed by either box annealing or continuous annealing, and the annealing temperature should preferably be at or above the recrystallization temperature. Generally speaking, the recommended temperature for box annealing should be 600 to 750 ° C, and the temperature for continuous annealing should be 750 to 90 Ot :. In any of the annealing processes here, the excessively large particle diameter of the ferrous iron after annealing is not conducive to the growth of electroplated crystals and may degrade the appearance of the electroplated surface. Therefore, the size of the ferrous iron crystal grains after annealing is preferably a fine grain size of 7 or more (indicated by JIS analysis method). If necessary, the consumer cooperation of the Central Economic and Technical Bureau of the Ministry of Economic Affairs of the People's Republic of China should be printed. If necessary, the annealed coils are tempered and subsequently subjected to an electroplating process. Continuous processes such as dipping are performed. The conditions of these processes are not subject to any specific restrictions. There are no specific restrictions on the type of plating. This plating includes galvanized alloys (such as zinc-iron alloys and zinc-nickel alloys and the like). In order to improve the corrosion resistance, coating property, fingerprint resistance, lubricity and the like, if necessary, chromate film, phosphate film, and t-sheet scales can be applied to the Chinese National Standard (CNS) Λ4. 2 丨 0 乂 297mm) — ~ 18 _ 4467 6 1 at B7 V. Description of the invention (16) Please read the precautions before reading this page, then fill in the resin film and the like on this page, and apply to the plating The surface of the layer. The coating process of these films is not particularly limited, and any appropriate process may be selected. These films may be laminated on the surface of the electroplated layer individually or in multiple layers. In terms of corrosion resistance, an electroplated steel sheet preferably has a chromate film and an organic resin film in this order, particularly formed on the surface of its electroplated layer. If necessary, the plated coil is tempered and then shaped into a specific shape. Any chromate process can be applied to the plating layer, including reaction chromate process, coating chromate process and electrolytic chromate process, preferably by mainly including a Cr compound and containing Various oxides (such as silicon oxide and organic. More methane) compounds, if necessary, can additionally include various reaction promoters (such as phosphoric acid, nitric acid, fluoride and fluorosilicide) to improve the stamped surface Corrosion resistance, abrasion resistance, blackening resistance and similar qualities. Ministry of Economic Affairs_Laboratory Consumer Co-operation of the Central Bureau of Standard Printing For the process of cleaning and coating a film mainly containing an organic resin on a chromate film, this coating can use a resin mainly containing a resin (Such as an epoxy series resin, a polyester series resin, a polyamide resin, an ethylene copolymer resin containing ethylene unsaturated carboxylic acid as a polymerization component '-a polyethylene series resin,-a polyamide Series resin, and a fluoride series resin) treatment solution is completed, and if necessary, may additionally include various oxide particles (such as silicon dioxide) and inorganic pigments (such as various phosphates), and wax Granules, an organosilicon compound, a naphthenate and the like to improve corrosion resistance, lubricity, abrasion resistance and cost Paper size Applicable to China National Standard (CNS) A4 (210X297 mm) 446761 A7 B7 V. Description of the invention (17) Quality of formability, weldability, electrodeposition coating, coating adhesion The film mainly includes an inorganic substance, and the coating can be performed using a treatment solution mainly containing silicates such as sodium silicate, potassium silicate, and lithium silicate, and if necessary, various other Oxide particles (such as silicone) and inorganic pigments (such as various phosphates), and wax particles, an organosilicon compound and the like to improve film forming, corrosion resistance, lubricity, abrasion resistance, and formability , Welding properties, electrodeposition coating properties, coating adhesion quality. The present invention will be described in detail by way of examples as follows. However, the present invention is not limited to the embodiments described below. As long as it does not depart from the spirit described above and later in this case, the modifications of the present invention are also included in the technical scope of this case. Preferred embodiment: Example 1 Effect of chemical composition (1) Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (Please read the precautions on the back before filling this page) Steel type, that is, sample, A 〃 to & quot P ", which has a chemical composition as shown in Table 1, was melted on a laboratory scale to prepare a slab having a thickness of 3 mm. Subsequently, these slabs were sequentially subjected to hot rolling, cold rolling, annealing, and electroplating processes to prepare electroplated steel sheets. More specifically, these types of steels lasted for one hour at a slab reheating temperature of 115 ° C 'and Processed to a final thickness of 3.6 mm at a processing temperature of 8 5 Q to 950 ° C. These products were then cooled at a cooling rate of 70 sec, and then subjected to a paper below 500 ° C. Applicable to China National Cricket (CNS) 8-4 (210 X 297 mm) -20-446761 A7 B7 — 11 ii — -----5. Description of the invention (18) hours of coiling process to prepare hot-rolled steel sheet. Some materials, ie samples ^ G, were subjected to a coiling process of one hour at 680 ° C. The produced hot-rolled steel sheet was subjected to dipping and then subjected to a cold milk reduction of 78% to prepare a cold-rolled steel sheet having a thickness of 0.8 mm. Subsequently, these steel plates were sequentially subjected to box annealing at 65 ° C for 20 hours, and then tempered at 0.5% (except for samples G to I, which are at 800. Minute continuous annealing and 0.5% tempering treatment). Thereafter, the obtained steel plates were washed in water, degreased and dipped in a sulfuric acid solution, and then these steel plates were sequentially subjected to electroplating, chromate And the process of applying cleaning resin, thereby producing an electroplated steel sheet having a weight of 20/20 g / m 2 of zinc ore layer. Various electroplated steel sheets are produced according to their tensile properties (drop strength). (YP), tensile strength (TS), and elongation (E1)), plating appearance, and blackening frequency were evaluated. The evaluation of the appearance and blackening frequency of the power mine was as described above. The results are shown in Table 2. (Please (Read the notes on the back before filling in this purchase)

Printed by the Consumers' Cooperative of the Central Bureau of Standards of the Ministry of Economics The paper size is applicable to the Chinese National Standard (CNS) Λ4 specification (210X 297 mm) -21-d 4 6 7 6 1 A7 B7 V. Description of the invention (19) Central of the Ministry of Economics Printed by the Bureau of Consumer Affairs of the Bureau of Standards Du Ο ^ 3Z ^ —sao ^ at7daow >-C3 < = »C3 Ο Ο C =) 〇 > 〇〇 < 〇0〇CDCDC5 Ο Ο ο ο ο ο 1— * ca co co * 〇 CJ1 Ό 0〇OCDOO < SO〇CO C0 CO CJ1 O ^ CCCTIiD- ^ IEsD ^ Cn CsDD〇C〇 > ™ * -〇〇aiOO ZJl 〇ο C3C5C30000C5 < = > CO 〇 OO OO 05 Ο ι— ^ ι—ι. Ι ~ ι 〇 ^ Cs3C3CDCDOCD «C3C3 [S5 μ * ·· * 1—ι [S3 H ~ fc h—i 〇 < =) CS Ο Ο CD t- * CD < = i〇OC3CDC3〇s; 〇〇h-fc DO Ι > 0 ^ t > 0 tO ◦ CO CJl tN3 〇 i ^ COtP ^ tOtOCsS ^ CJICJICQOCOOO. Prepare 〇 · O CD Ο 〇 Ό OOOOOCDCD m CD CD 〇ι—ι C3 〇CD ^ > " «4 ^ am4 〇5 cjn i— ^ OOOOOOOO 铒 cn OCO — OOC7ICOOO — ^ CJl〇lCJ1000-4CJl» 〇 < 〇O CD «C3 < D OOOOOOOCDO _ ο ο C = > < = ϊ C = > 〇Q GGOOOCDeOO CO mi 1—1 Η-1 C7I tfi. 〇3 cn CJi H-1 1—1 H- ^ < = 3 " j〇c〇〇cn4 ^ cncn Φ • w Ο ό OOOOO OOOOOC3C3C3CD perish CS Ο 1— * CD 〇CD CD {> 〇 私 私 私 私 CD —J 05 〇Ι 〇〇〇〇〇〇〇〇〇〇A 〇 私 C71 < OOOCJ1C〇-4C5COO〇CJJ c = > 〇 〇 〇 〇 〇 0000000030 s: ο μ—1 Ό Ο οο ο < 3 > Ο Οί Ο Ο μ- ^ [> .3 η-α CD Ο Ο | Ν3 CD OOOOOCSOCDO 1—A 1 —] _ L 1—k 1—i I »P4 to CpO 1— CD, C3 CD C3 C = > < =) < ^) OOOCDCDCDOCSQ Ο tn 0050 0040 0039 0053 0045 0045 0060 0070 0045 0043 1 0052 0040 0025 0023 0025 T \ S Min mi Zangpu spectrum m (please read the notes on the back before filling this page):, The size of the paper is bound to the Chinese national standard {CNS} 4 specifications (2 丨 0X 297 mm) 22 44676 1 A7 B7 5 Description of the invention (20) Printed by the Ministry of Economic Affairs' Order of the Central Government Bureau of Staff Consumer Cooperatives 〇3ί ίΓ-1 W ¢ -1 1— < MO ^ IC ^ t =? OC〇 > o 〇〇CJ1 oo ο —CO CO CO DO 〇 〇CO ^ to CO —a — oo oo 〇Cs3 DO Hi CO CO i—1 · — * ►— * · —1 ODO < D-4COCJ1C〇C5〇〇3 B w 谇 Μ < -Η CO s: υτ 'w / 〇〇CO CJ1 CO CO to CO ΟΊ CO CO cn cn t- * oo oo | > 〇t > 0 ^ CJl DO ^ COCOtC ^ CODOCOCOCO 〇3 私 〇〇〇03〇3 < 00 — CO 〇H -ICO »—1〇0003CJ10 / — \ Ή S on B Private cn l · ^ £ > 0 CO CO CO CO cc oo σ ΐ o cji ccco» P ^ 4 ^^ cn ^ cji ^. 〇5 «UDCCCJ1〇0 ^ 〇OC3Ca3-· _ ^ 识 _ 〇X oooxo 〇〇〇〇〇〇〇〇〇〇 馎 m Life dark CO CO GO OO cn OT on Η-ah-1 i- ^ i-A 〇J >-^ < Z〇〇l—1 A 遄 鄕 CjJ —J CO CO oj〇3 * Jco-j «a 5ϋϋ ~ \ ~ r rv 缈 Total temperature m ϊι | minus! ι | Note on the back 4 :: Write this page) Factory-installed · The size of the paper is applicable to China National Standard (CNS) A4 (210X 297 mm) 446761 A7 B7 5. Description of the invention (21) These results can be revealed as follows. In all the samples up to the Ni content requirement of the present invention, the blackening frequency was adjusted to 10% or less as a target level. Among these aforementioned samples, the samples, A_ to ^ 1 〃 (where elements other than Ni can satisfy the preferred requirements of the present invention) have low strength and high elongation 'and also have good formability and plating appearance, Point out that these samples are good electroplated steel plates. Conversely, the blackening frequency is very high in steel samples with Ni content exceeding the upper limit defined by the present invention. Window Example 2 Effect of slab reheating temperature (1) Staff of the Bureau of Standards. Consumer cooperatives print and use steel types 'A #' that meet the requirements of the present invention. As shown in Table 1, the effect of slab reheating temperature during hot rolling is examined. More specifically, the slab is drawn for an hour at 10 50 to 1 300 ° C, and then subjected to the same process as in Example 1 to prepare an electroplated steel sheet. In the same manner as in Example 1, the resulting electroplating is decided Tensile properties and blackening of steel plates, as well as deep drawing properties (Λ r " value). Among them, the calculation of the 'r " value is as follows "Value {Please read the notes on the back before filling this page) (r L + r N + 2 r C) / 4 (where r L, r N and r C Representing along the rolling direction, the base is straight to the rolling direction, and the value of 45 degrees with the rolling direction ^ • Value) This paper size is applicable to the Chinese standard (CNS) A4 (210 × 297 mm)- 24-446761 A7 B7 V. In the description of the invention (22), 3 is shown in the production factory showing the results (please read the precautions on the back before filling this page). The standard printed on the paper by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs applies. China National Standard (CNS) Λ4 specification (nOXM7 male thin) 4467 6 1 A7 B7 V. Description of invention (23) Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs > »03 s S g: μ— ^ CO CD Ο i —I > CO cn O c = »Η-k μ—k οι G — H- * C3 1— S o M shallow-HtJ 〇 ° sm P | hm ml l * Ul '1- ^ μ- * a blue» --Fc g € = paintings to 筠 -¾ 瑢 CO CJl v- ^ CO CO ςη CO CO o CO CvD 0¾ CO cc OO CO CO G CO CO DO S '1- N Private W- * Will tN3 Private CO Private CO C DO to CO o CsD CO H- + tO CO —3 to • o CO DO On < Ti to —a a_ 1—A 3 i—a 03 OO 1—k CO 1—k) —l * " LN · 1 筠 済 ϊ® XX 〇〇〇〇〇m Indole 馎 CO -J pa CO CJ1 CD 03 Ca3 1 ~ k Total bundle w M a Country kite (Please read the precautions on the back before writing this page) Order This paper standard applies Chinese national standard (⑽Λ · (加加 公 康)-Grab_ A7 B7 V. Description of the invention (M) As clearly shown in the table, it indicates that these slabs are reheated if they meet the definition of the present invention.) Among all samples required for temperature, in terms of their tensile properties, deep drawing properties, plating appearance, and blackening frequency, they are good plated steel plates. Conversely, samples that have not met the slab reheating temperature requirements according to the present invention and In AA6 ^, the blackening frequency is far higher than the target value by 10%; and its plating appearance is also severely deteriorated. Example 3 Example of Actual Manufacturing (1) The steel type 'Α shown in Table 1 is then continuously cast into A slab with a thickness of 2 3 is treated in the process of 1 1 50 1 and 1 3 00 ° C. Then, the slab is processed at 9 Hot rolled steel having a thickness of 3.8 mm was prepared, and the coils coiled at 500 ° C were dipped at an average cooling rate of 90 ° C / sec, and the final thickness thereof. Subsequently, these coils were fired for a period of 6 to 24 hours, and then subjected to 0.5% of the return in the same manner. * The coils obtained were then plated. In the same manner as in Example 2, the mechanical properties and blackening were determined. Frequency and similar. The paper size of the paper is in accordance with the Chinese National Standard (CNS) Λ4 grid (210 × 297 mm) > Please read the note on the back-first, and then print it out in a consumer converter of the Central Standard Bureau of the Ministry of Economic Affairs 8mm 8 0 ° C 的 同 热 箱 · The slabs were melted and the obtained slabs were reheated at a processing temperature of 20 ° C. These steel plates were cooled and then cold rolled to 0.8 mm 8 0 ° C. "Medium annealing rolling" The results of the plated steel plate produced in Example 1 through treatment to produce plated steel are shown in Table 4 β -27-4 46 761 A7 B7 V. Description of the invention (25) Ministry of Economic Affairs Printed by Bei Gong Consumer Cooperative · * < ί X 2: mm 1— * ο g -hri 〇 ° iwa 缨 m Twil WH · Xue Hk oo oo oo Cs3 i = § 筠 ^ 5: f 汶 f # # ω ςα CO CO CO M v -_- / < — < Cn oo CO 3: CJl ¢ 3 CO CO CJ1 to DO 03 Er 1-k 1-k 3 Box 03 CJl © 筠 m A if X 〇 豳 woven ind CO CO 0¾ h—i \ tte pay U1 e hinder 3te \ ~ r rv total score (please read the back first (Please fill in this page again)

A This paper is also applicable to China's compensation standard (called Na (2 嶋 -28 _ 44676 1 at B7. Five 'invention description (26) As clearly shown in the table, a sample that meets all the requirements of the present invention' X ", It has a lower blackening frequency, and very good other properties. Therefore, it is pointed out that such electroplated steel sheet can be manufactured on a manufacturing scale. Differently, the sample Αγ & quot Medium • Has a very high frequency of blackening and poor plating appearance. 賨 Example 4 Effect of chemical composition (2) Printed on the steel of the chemical composition shown in Table 5 (Sample of the chemical composition shown in Table 5) " Α 〃 至 'pg) Melt on a laboratory scale to prepare slabs with a thickness of 30 mm, and then subject the obtained slabs to hot rolling, cold rolling, annealing and electroplating in order to prepare plated steel sheets 》 More specifically, these types of steel are processed for one hour at a slab reheating temperature of 1 150 ° C and are processed to a final thickness of 3.6 mm at a processing temperature of 920 to 9 50 ° CC. Then * These ones The product was cooled at a cooling rate of 70 ° C / sec, and then subjected to a coiling process for one hour at 68 ° C to prepare a hot-rolled steel sheet. The prepared hot-rolled steel sheet was dipped and then subjected to 78% The amount of cold rolling was reduced to prepare a cold-rolled steel sheet having a thickness of 0.8 mm. Then, the obtained steel sheet was subjected to continuous annealing at 800 ° C. for 1 minute and tempered rolling of 0.5%, and thereafter, The obtained steel plates were degreased and dipped in a hydrochloric acid solution. Then, these steel plates were sequentially subjected to electroplating, a chromating process, and a process of applying a cleaning resin, thereby having an electroplating of 20/20 g / m2. The deposition degree of the electroplated steel sheet was produced. This paper is also applicable to the Chinese National Standard (CNS) A4 specification (210XM7 mm) ~ 29 A7 B7 4 46 76 t V. Various different electroplated steel sheets produced by the invention description (27), According to its tensile properties (except for YP, TS and E 1, the stretch formability (value) is based on

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Ti: 0.065 Tio.065 Nb: 0. 035 Ti: obo Nb: ps5 Ti: 0.065 BOO015 Ti: 0 = 20 Nb: ps5 Bo.0015 Ti: 0.065 Ti: 0.075 Ti: p075 1 Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs Printing crack is s »ring j W4ms This paper size is applicable to the Chinese National Standard (CNS) Λ4 specification (210X297 mm) 3.1 4 4-676 1 A7 B7 V. Description of the invention (29) Offload Consumer Cooperative of the Central Bureau of Standards, Ministry of Economic Affairs印 策 ^ 〇s: 5C r 孔 一 ^ i = ao ^ ac = dc? R5d3 >-〇 〇〇Ί Ο 1—k 05 o CO | > 3 cc cd CJ1 〇 > —1 I-— [S3 c ^ 3 i—1 · — * · —1 ►—1 ·-** ^ ^ ¢ 005 (00303 ^ 014 ^ 4 ^. 0- < | OTa5CJ1CJ10 · — \ ι- < 3 B ^ -0 3 Μ F # Μ / -V CO CO CO 〇CO CO cn CO CO CO O 03 CO CO ο ο οι tn ACOCOCOCCDOCODOOO crscotnooco — cooo oocjicnoooocn 3 00 Β W Nw / CO ο .CJi cn OO CO Private CO CO Private co ca cji cn COCOt ^^^ Ol ^ CJlCJI i ^ .COt > OCn〇OG〇OOCO ^ t = 3 • w Of ο l > 3 DO CS3 CO OO 〇o DO CJ1 o O GTS Ο O [> 0 DO DO Cv3 OO 〇 〇 —Private ^ O CO o 0 < Z > C = J000C3CDCD DOOODODOtrODOCOOOCO ^ c * ocociitn〇5tn〇3-j OO-JCO CTI ^ OCJIO |, n " value — H- * h—if— * h—kh—ii—i η- * EsD i—ii—CsD = Miscellaneous CJ1 CJl ZJl CO 00 zn cji tn cd CJI O CJ1 o cnioooocoooococoo OOC〇OCO > " * " JC〇C5 Yao m ii 〇〇X OD > > x 〇〇〇〇〇〇〇〇〇〇〇 雠 m πΜϋ Neck O > —1 CO ◦ m —J ΟΊ c * : OfOODOCO— COCO — A Myanmar 鄕 CJ1 »o CJl CJ1 H- * 〇rooioocjioecnaicji 5 tree Ϊ® 儆 Vr rr Ψ Township m-shirt flaps please read first. Please read the notes on the back and fill in, write this page The paper size of the edition is applicable to the Chinese National Standard (CNS) Λ4 specification (210X297 male; t) -32-446761 A7 _B7_ V. Description of the invention (30) These results can be revealed as follows. In all of these samples, the blackening frequency was adjusted to 10% or less as a target level among all the samples satisfying the content requirements of the present invention. * Among these aforementioned samples, 'Sample " A ^ to' 1〃 (In addition to Ni, other elements can satisfy the better requirements of the present invention) have lower drop strength and higher elongation (regardless of tensile strength), and also have good formability and plating appearance, point out these samples For good plated steel. Conversely, the blackening frequency is very high in steel samples whose Ni content exceeds the upper limit defined by the present invention. Β Window Example 5 Effect of slab reheating temperature (2). (Please read the precautions on the back before filling this page) Using the steel types of the present invention as shown in Table 5, the effect of slab reheating temperature during hot rolling is tested β More specifically 'slab is heated to 1 0 5 0 to 1 3 0 0 ° C -hour 'and then subjected to the same process as in Example 1 to prepare a plated steel sheet. In the same manner as in Example 4, the mechanical properties of the resulting plated steel sheet, such as tensile properties and blackening, were determined. The results are shown in Table 7. This paper size applies the Chinese National Standard (CNS) Λ4 (2! 〇 × 297 mm) -33-446761 V. Description of the invention (31) Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs & s £ p5 ο l · — * DO CJi ο h— * g 〇k—k H—ks — g CD g ϋ rfl 薛 砘 m Itrrr hl CJ1 C7I ◦ Ren Han 1—k CO OO W € = Changzhai. Examiner / " S t-π w 2: CJI CJI CO CO G DO oo OT CO 00 CJI cc 00 CO ΓΟ oo o ϊ 泛 C7I 〇〇CJi DO CJI CO CJI CO ΟΊ ΟΊ CD CO C7I IN3 ο »CO CJI C71 CD DO CD — JP * £ 〇CD o to CO 〇 > CO 0〇a Nf CO ο ca cn F ° 〇CO • EΌ l · * -1 cn F ° ai Cn ht-1 1 broken XX 〇〇〇〇〇 w CJ1 00 CJt 1- ^ Cn gj CJI o CO Township; P Room Che HI various m Please read the back-first

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I The paper size is in accordance with the Chinese National Standard (CNS) A4 specification (210X2!? 7mm) 446761 V. Description of the invention (32) Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economy X Η-4 〇η-L 1—L crt ϋΐ m 〇 ° S w Xue m itfti σί μ-th—ks Ϊ4 Γ0 筠 CO g; CJl OS CO chang〇 > M 'w * A OQ o IS > CJ1 cn Ρ »oo 03 os S3— CO s ΓΟ CO 〇1 ★ Luo I # alkali X 〇valve mm Han Han CO p cn t— * a miscellaneous cabinet ^ ta Vv cv 铒 ϋ! 1 pay m I L -------- install -(Please read the precautions on the back of this page and read the r # page again). Book size. This paper size applies the Chinese National Standard (CNS) Λ4 specification (210X297 mm) -33-4 4676 1 a? B7 V. Invention Explanation (33) As clearly shown in the table, it points out that all the samples that meet the reheating temperature requirements of the slabs defined in the present invention, regarding its tensile properties, deep drawing properties, electroplating In terms of appearance and blackening frequency, it is a good plated steel plate. In contrast, in samples that did not meet the slab reheating temperature requirements according to the present invention, the sample was 'A6'. The black frequency is far more than the target value of 10%: and the appearance of its plating is also deteriorated sharply. Example 6 Actually manufactured (2) Example Printed by the Consumer Standards Cooperative of the Central Bureau of Standards of the Ministry of Economy 'A 〃 is melted in a converter, and then continuously cast into a slab with a thickness of 230 mm. The obtained slab is reheated at a temperature of 1 150 ° C and 1 300 ° C. Both processes are handled. Then, the slab was prepared into a hot-rolled steel sheet having a thickness of 3.8 mm at a processing temperature of 920 ° C. These steel plates were cooled at an average cooling rate of 90 ° C / sec, and then the coils coiled at 680 ° C were dipped and cold rolled to a final thickness of 0.8mm. Subsequently, these coils were continuously annealed at 800 ° C for one minute, and then subjected to tempering rolling at 0.5%, following the same procedure as in Example 5 to prepare electroplated steel sheets. In the same manner as in Example 4, the mechanical properties and blackening frequency of the resulting plated steel sheet were determined. The results are shown in Table 8. a. As clearly shown in the results of the table. * Meets all the requirements of the present invention. The paper size applies the Chinese National Standard (CNS) A4 specification (2 丨 0X 297 male thin). _ 36 — 446761 A7 B7_ ^ 5. The sample "X '" of the invention description (34) has a low frequency of blackening, and has a very good other properties (please read the notes on the back of the page 34, and then compare this page) with other properties. Therefore, it states that such plated steel sheets can be manufactured on a practical scale. On the contrary, in the sample " Y " which has not satisfied the slab reheating temperature requirement of the present invention, it has a very high frequency of blackening and poor plating appearance. As described above, the steel sheet is very useful for manufacturing an electroplated steel sheet having a relatively low blackening frequency and good surface properties. According to the method for manufacturing a steel sheet for electroplating according to the present invention, the above-mentioned steel sheet can be manufactured with high efficiency. If other elements than Ni are adjusted by the method of the present invention, a plated steel sheet having good formability can be produced. Brief description of the drawing = printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs Figure 1 depicts the relationship between the blackening frequency and the Ni content in a steel without T i added. Figure 2 depicts the relationship between the blackening frequency and the slab reheating temperature in a steel without Ti added. FIG. 3 depicts a curve of Ni concentration in a steel without Ti added. FIG. 4 illustrates the relationship between the Ni concentration in the surface layer of a steel plate and the appearance of the plated surface in a steel material without Ti added. Figure 5 depicts a paper with no Ni added, with a Ni concentration of 4%. This paper size is applicable to China National Standards (CNS) Λ4 specification (210X297 mm) 446761 A7 B7 5. Description of the invention (35) Atomic percentage or The relationship between the less depth and the appearance of the electroplated surface. FIG. 6 illustrates the relationship between the blackening frequency and the Ni content in a steel with Ti added. Fig. 7 illustrates the relationship between the blackening frequency and the slab reheating temperature in a Ti-added steel. Figure 8 depicts a curve of Ni concentration in a Ti-added steel. FIG. 9 illustrates the relationship between the Ni concentration in the surface layer of a steel plate and the appearance of the plated surface in a steel with Ti added. Fig. 10 depicts the relationship between the depth at a Ni concentration of 4% or less in a Ti-added steel and the appearance of the electroplated surface (please read M-Notes on the back of the sea, and then respect (This page) The printed paper size of the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs applies to the Chinese National Standard (CNS) Λ4 specification (2ίΟ × 297 mm) 38-

Claims (1)

This Notice 6 7 6 4 4 8888 ABaD Printed by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 6. Scope of Patent Application • No. 85106745 Patent Application Chinese Application for Patent Scope Amendment February 2009 1. Amendment 1. Good blackening resistance for electroplating A steel sheet in which the Ni content in the steel sheet is limited to not more than 0.06% by weight, and the Ni concentration in the surface layer of the steel sheet is 10% by atomic percentage or less, and 20% below the steel sheet surface. Ni concentration at a depth of 0 Angstroms is 4% atomic percent or less "2. A steel sheet for electroplating with good blackening resistance, comprising: CS0.10%, Si ^ 0.2% ' Μ η ^ 1.8% 'P ^ 0. 10%, α Γ from 0.005 to 0, 10%, and NS 010%, and further optionally includes Ti from 0.005 to 0.1%, ◦. 005 06% 的 重量。 At least one of Nb, 0005 to 0.003% B and the balance of Fe and other unavoidable impurities, wherein the Ni content in the steel plate is limited to not more than 0.06% by weight. And the Ni concentration in the surface layer of the steel plate is 10% atomic percent or less And the Ni concentration at a depth of 200 angstroms below the surface of the steel sheet is 4% atomic percent or less. 03% 的 重量 ％ 或少。 3. The steel sheet for electroplating according to item 1 or 2 of the scope of patent application, wherein the Ni content in the steel sheet is 0.03% by weight or less. 4. An electroplated steel sheet produced by electroplating a steel sheet for electroplating according to item 1 or 2 of the scope of patent application. This paper size applies to China National Standard (CNS) A4 specification (210 X 297 mm) ------------: one pack -------- order --------- --Line.1 (Please read the notes on the back before filling this page) 446761 ABaD Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs on consumer cooperation. 6. Scope of patent application 5. A type of electroplated steel plate is produced by electroplating the steel plate used for electroplating according to item 3 of the scope of patent application. 6. The electroplated steel sheet according to item 4 of the scope of patent application, wherein a chromate film and a clean resin film are sequentially applied to the surface of the electroplated layer. 7. The steel plate for electroplating according to item 1 or 2 of the scope of patent application is used as an external steel material for electrical products. '8. Steel plate for electroplating according to item 3 of the scope of patent application' Used as an external steel material for electrical products. 9. The electroplated steel sheet according to item 4 of the scope of patent application is used as an outer plate for electrical appliances. 10. The electroplated steel sheet according to item 5 of the scope of patent application is used as an outer plate for electrical appliances. 11. A method for manufacturing a steel sheet for electroplating having good blackening resistance, by using a steel with an Ni content not exceeding 0.06%, in which the slab reheating temperature is adjusted to 1 0 5 0 ° C to 1 2 0 0 ° C 1 whereby the Ni concentration in the surface layer of the steel sheet used for electroplating is adjusted to 10 atomic percent or less, and the Ni concentration at 200 angstroms below the steel sheet surface Atomic percentage of 4% or less * 12. The manufacturing method according to item 11 of the scope of patent application, wherein the Ni content in the steel is 0.03% by weight or less. The manufacturing method of item 11 or 12, wherein the steel material satisfies CS0. 10%, S i ^ 0.2%. The paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm). (Please read the note on the back first (Please fill in this page again) " installation ---- 1 ---- order --------- line '44676 1 Δδ Β8 C8 D8 years and 90. 2. 12 0 · 0 5 to 5, the scope of the patent application 'M η ^ 1.8%' P ^ 0. 10% 0.10% of A1 and N. 010% of demand. 14. A method for manufacturing an electric ore steel plate having good blackening resistance, comprising a procedure for electroplating a steel plate made by a manufacturing method according to the scope of claims 11 or 12 of the patent application. 15. —A method for manufacturing an electroplated steel sheet with good blackening resistance, including a procedure for electroplating a steel sheet made by the method of making it according to item 13 of the scope of patent application (please read the back first Please pay attention to this page before filling in this page) -------- Order --- In --- Consumer cooperation with employees of the Intellectual Property Bureau of the Ministry of Economic Affairs Du printed this paper The size of the paper is applicable to China National Standard (CNS) A4 specifications (210 X 297 mm)