CN104955976A - HOT-DIP Al-Zn GALVANIZED STEEL PLATE AND METHOD FOR PRODUCING SAME - Google Patents
HOT-DIP Al-Zn GALVANIZED STEEL PLATE AND METHOD FOR PRODUCING SAME Download PDFInfo
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- CN104955976A CN104955976A CN201480006168.1A CN201480006168A CN104955976A CN 104955976 A CN104955976 A CN 104955976A CN 201480006168 A CN201480006168 A CN 201480006168A CN 104955976 A CN104955976 A CN 104955976A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
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Abstract
The problem addressed by the present invention is to provide a method for producing, on a continuous hot-dip galvanizing line, hot-dip Al-Zn galvanized steel plate having outstanding corrosion resistance in the flat part and excellent corrosion resistance in worked parts by virtue of good workability, and hot-dip Al-Zn plated steel plate obtained using said method. In order to address the aforementioned problem, the present invention is a continuous hot-dip galvanizing facility, wherein the steel plate after hot-dip galvanization is maintained for 5-60 seconds at a temperature of 250-375 DEG C.
Description
Technical field
The present invention relates to the erosion resistance and melting Al-Zn system's coated steel sheet that the erosion resistance of processing department is also excellent due to good processibility and manufacture method thereof with good flat part.
Background technology
Melting Al-Zn system coated steel sheet can have the sacrifice corrosion of Zn and the high erosion resistance of Al concurrently, therefore demonstrates excellent erosion resistance compared with other hot-dip galvanized steel sheet.Such as, the melting Al-Zn system coated steel sheet of the Al containing 25 ~ 70 quality % in plating epithelium is disclosed in patent documentation 1.And melting Al-Zn coated steel sheet is due to the erosion resistance of its excellence, and be therefore exposed to the outdoor building materials field such as roof, wall between long-term, centered by the civil construction fields such as guardrail, distribution pipe arrangement, sound-proof wall, demand is in continuous increase in recent years.
The plating epithelium being formed at melting Al-Zn system coated steel sheet is made up of the alloy layer existed at the interface with base steel sheet and the upper strata existed above it, the part (rich Zn phase) that main supersaturation ground in upper strata is the dendroid part (rich Al phase) of solidifying and remaining dendroid space containing Zn and by Al is formed, and rich Al phase has the structure of the film thickness direction multi-laminate at plating epithelium.By this distinctive epithelium structure, corrosion from surface is carried out path and is become complicated, therefore corrosion is difficult to easily arrive base steel sheet, and melting Al-Zn system coated steel sheet can realize excellent erosion resistance compared with the thick identical hot-dip galvanized steel sheet of plating epithelium.
In addition, the zinc flower decorative pattern solidified from plating is there is on the surface of melting Al-Zn system coated steel sheet.This zinc has the fine convex-concave corresponding with above-mentioned rich Al phase and rich Zn in spending, it can by light diffuse-reflectance, and therefore the surface presentation of melting Al-Zn system coated steel sheet sends the aesthetic appearance of silvery white radiance.
For this melting Al-Zn system coated steel sheet, generally by through pickling deoxygenated skin hot-rolled steel sheet, maybe this hot-rolled steel sheet is carried out the cold rolling and cold-rolled steel sheet obtained as base steel sheet, manufacture in continous way melting plating equipment.
Specifically, first in the annealing furnace being held in reductibility environment, base steel sheet is heated to specific temperature, anneals, and carry out the removing of the rolling wet goods being attached to surface of steel plate and the reduction removing of oxide film.Then, by making steel plate impregnated in the spout of plating bath by lower end, base steel sheet be impregnated in the plating bath of melting Al-Zn system.Thereafter, the steel plate that impregnated in plating bath is promoted to the top of plating bath via sinking roller (sink roll), spray the gas of pressurization from the gas scraping nozzle be configured in plating bath to the surface of steel plate and adjust plating adhesion amount, utilize refrigerating unit to cool, thus obtain the melting Al-Zn system coated steel sheet being formed with required plating epithelium.
Then, in order to ensure required plating quality, material, the operational conditions such as the speed of cooling after the composition of the heat-treat condition of the annealing furnace in above-mentioned continous way melting plating equipment, envrionment conditions, plating bath or plating are carried out adjusting, managing.
Generally speaking, if plating epithelium is thick identical, then alloy layer is thinner, improves effective upper strata become thicker to erosion resistance, and therefore the suppression of alloy layer growth can contribute to the raising of erosion resistance.In addition, compared with upper strata firmly, adding the starting point becoming crackle man-hour, therefore the suppression of alloy layer growth also can have the effect making the generation of crackle reduce, bendability is improved to alloy layer.And the crackle portion produced exposes base steel sheet and makes erosion resistance be deteriorated, the minimizing that therefore crackle produces can make bending machining portion erosion resistance improve.
Prior art document
Patent documentation
Patent documentation 1: No. 46-7161, Japanese Patent Publication
Summary of the invention
As mentioned above, melting Al-Zn system coated steel sheet, due to the erosion resistance of its excellence, is used to long-term exposure mostly in the building materials field such as roof, wall of outdoor.
In addition, the melting Al-Zn system coated steel sheet manufactured with continous way melting plating equipment, plating epithelium is by quenching but not solidify evenly, thus plating upper strata hardening, when therefore carrying out bending machining, plating epithelium breaks and cracks, its result, processing department corrosion-resistant sometimes.Therefore, expect by improving processibility and improve processing department erosion resistance.
The present invention is in view of this situation, object be to provide a kind of can by the manufacture of continous way melting plating equipment have good flat part erosion resistance and due to good processibility the method for the melting Al-Zn system coated steel sheet that the erosion resistance of processing department is also excellent, and the melting Al-Zn system coated steel sheet obtained by the method.
The present inventor etc. are in order to solve above-mentioned problem, repeatedly conduct in-depth research, it found that, by in continous way melting plating equipment, for the coated steel sheet after melting plating, keep certain hour with specific temperature range, can by plating epithelium softening, its result, can obtain having the erosion resistance of good flat part and the melting Al-Zn system coated steel sheet that the erosion resistance of processing department is also excellent due to good processibility.In addition, find the coated steel sheet after for above-mentioned melting plating, by being cooled to specific temperature hastily, the formation of zinc flower can be suppressed, realizing excellent appearance uniformity.
The present invention completes based on above discovery, and its purport is as described below.
1. a manufacture method for melting Al-Zn system coated steel sheet, is characterized in that, in continous way melting plating equipment, is kept 5 ~ 60 seconds by the steel plate after melting plating at the temperature of 250 ~ 375 DEG C.
2. the manufacture method of the melting Al-Zn system coated steel sheet as described in above-mentioned 1, is characterized in that, the steel plate after above-mentioned melting plating was cooled within 5 seconds the bath temperature-80 DEG C of plating bath from the bath temperature-20 DEG C of plating bath.
3. the manufacture method of the melting Al-Zn system coated steel sheet as described in above-mentioned 2, is characterized in that, be set within 3 seconds the cooling time of above-mentioned coated steel sheet.
4., as the manufacture method of the melting Al-Zn system coated steel sheet according to any one of above-mentioned 1 ~ 3, it is characterized in that, the maintenance temperature of above-mentioned coated steel sheet is 300 ~ 375 DEG C.
5., as the manufacture method of the melting Al-Zn system coated steel sheet according to any one of above-mentioned 1 ~ 4, it is characterized in that, the hold-time of above-mentioned coated steel sheet is 5 ~ 30 seconds.
6. as the manufacture method of melting Al-Zn system coated steel sheet according to any one of above-mentioned 1 ~ 5, it is characterized in that, above-mentioned coated steel sheet is cooled to less than 375 DEG C taking a step forward of contacting with top roll.
7. a melting Al-Zn system coated steel sheet, it is characterized in that, be there is the plating epithelium obtained by the manufacture method according to any one of above-mentioned 1 ~ 6, above-mentioned plating epithelium is made up of the interface alloy layer existed at the interface with base steel sheet and the upper strata existed over the alloyed layer, this upper strata has following composition: the Al containing 20 ~ 95 quality % and this Al content less than 10% Si, rest part by Zn and inevitably impurity form, the Vickers' hardness average out to 50 ~ 100Hv of above-mentioned plating epithelium.
8. the melting Al-Zn system coated steel sheet as described in above-mentioned 7, is characterized in that, in above-mentioned upper strata, further containing add up to 0.01 ~ 10 quality % to be selected from Mn, V, Cr, Mo, Ti, Sr, Ni, Co, Sb and B one kind or two or more.
9. the melting Al-Zn system coated steel sheet as described in above-mentioned 7 or 8, is characterized in that, the mean sizes of the zinc flower of above-mentioned plating epithelium is below 0.5mm.
According to the present invention, the manufacture of continous way melting plating equipment can be utilized to have the erosion resistance of good flat part and the melting Al-Zn system coated steel sheet that the erosion resistance of processing department is also excellent due to good processibility.
Accompanying drawing explanation
Fig. 1 is the process picture sheet of an embodiment of the manufacture method representing melting Al-Zn system of the present invention coated steel sheet.
Embodiment
With reference to accompanying drawing, the manufacture method of melting Al-Zn system of the present invention coated steel sheet is described.
Fig. 1 is the figure of the roughly flow process of the manufacture method represented about melting Al-Zn system of the present invention coated steel sheet.
(manufacture method of melting Al-Zn system coated steel sheet)
The manufacture method of melting Al-Zn system of the present invention coated steel sheet is the method carrying out manufacturing in continous way melting plating equipment.By utilizing continous way melting plating equipment to manufacture, compared with situation about manufacturing, Al-Zn system coated steel sheet can be manufactured efficiently with further combining intermittent type heating installation in melting plating equipment.
Then, as shown in Figure 1, the invention is characterized in, after the pre-treatment such as degreasing, pickling (pretreatment procedure) and annealing (annealing operation) are carried out as required to processed steel plate (base steel sheet), implement melting plating (plating process), preferably the steel plate after melting plating was cooled within 5 seconds the bath temperature-80 DEG C (rapidly refrigerating work procedure) of plating bath from the bath temperature-20 DEG C of plating bath after, this coated steel sheet is kept 5 ~ 60 seconds (temperature maintenance operation) at the temperature of 250 ~ 375 DEG C.
For the kind of melting Al-Zn system of the present invention coated steel sheet base steel sheet used, be not particularly limited.Such as, can use through the hot-rolled steel sheet of pickling deoxygenated skin or steel band or they are cold rolling and the cold-rolled steel sheet obtained or steel band.
In addition, the condition of above-mentioned pretreatment procedure and annealing operation is also not particularly limited, arbitrary method can be adopted.
For the condition of above-mentioned melting plating, as long as Al-Zn system plating epithelium can be formed in above-mentioned base steel sheet, be just not particularly limited, can be undertaken by ordinary method.Such as, after above-mentioned base steel sheet reduced anneal, being cooled near plating bath temperature, making it impregnated in plating bath, thereafter, the plating epithelium of required thickness can be formed by carrying out swiping.
Al concentration in the plating bath of above-mentioned melting plating is set to 20 ~ 95 quality %.In addition, in order to suppress excessive alloy layer growth, containing the Si of less than 10% of Al content in plating bath, rest part is made up of Zn and inevitable impurity.And then, preferably in above-mentioned plating bath containing add up to 0.01 ~ 10 quality % be selected from Mn, V, Cr, Mo, Ti, Sr, Ni, Co, Sb and B one or two or more kinds.By being set to the plating bath of this composition, plating epithelium described later can be formed.
In addition, as described below, the plating epithelium utilizing above-mentioned Al-Zn system plating bath to be formed is made up of the interface alloy layer existed at the interface with base steel sheet and the upper strata that exists on this interface alloy layer.Although the composition on this upper strata is lower slightly at interface alloy layer side Al and Si, roughly the same with the composition of plating bath on the whole.Therefore, the composition on plating upper strata control can by control plating bath composition come precision carry out well.
And as shown in Figure 1, manufacture method of the present invention, preferably for the steel plate after above-mentioned melting plating, was cooled to the bath temperature-80 DEG C (rapidly refrigerating work procedure) of plating bath within 5 seconds from the bath temperature-20 DEG C of plating bath.By this refrigerating work procedure rapidly, the formation of zinc flower can be suppressed, especially can obtain the appearance uniformity of excellence when forming film.Specifically, the mean sizes of zinc flower can be controlled at below 0.5mm.
If the mean sizes being formed at the zinc flower of plating epithelium is below 0.5mm, when then film (especially requiring the film of the high gloss of level and smooth and uniform outward appearance) being formed at melting Al-Zn system's coated steel sheet of the application and using, there is no the situation that the border emersion of zinc flower is in sight to film coated surface, appearance can not be damaged, therefore particularly preferably.
In addition, from the aspect obtaining higher zinc flower inhibition, within the above-mentioned cooling time cooled rapidly is preferably 3 seconds, within being more preferably 1 second.In addition, when the cooling time till above-mentioned plating bath temperature-80 DEG C is greater than 5 seconds, the inhibition of zinc flower is insufficient, and mean sizes cannot be made to be below 0.5mm.
But, when manufacturing in the purposes that can not become problem for the formation of zinc flower or need zinc flower to be formed, this refrigerating work procedure rapidly may not be carried out, not limit manufacture method in this case.
In addition, as shown in Figure 1, be preferably cooled to impregnated in the coated steel sheet having implemented plating after plating bath less than 375 DEG C (cooling before by top roll) taking a step forward of contacting with top roll.This be due to, when the temperature having implemented the coated steel sheet of plating before contacting with top roll is greater than 375 DEG C, likely when touching top roll, plating epithelium is attached to top roll, and a part for plating epithelium is stripped (metal sticking (metal pickup)).
Here, after " top roll " refers to and implements melting plating to above-mentioned base steel sheet, the roller that the steel plate having implemented plating contacts at first.
Then, the raising method of the processibility of most important plating epithelium in the present invention is shown.In manufacture method of the present invention, importantly the steel plate after melting plating is kept 5 ~ 60 seconds (temperature maintenance operation) at the temperature of 250 ~ 375 DEG C.Operation is kept by this temperature, due to the above-mentioned nonequilibrium freezing becoming the reason of the hardening of plating epithelium, the strain be directed in plating epithelium is liberated, and in Al-Zn system plating, promotes that rich Al phase is separated with two of rich Zn phase, therefore can realize the softening of plating epithelium.Its result, can improve processibility.In addition, the plating epithelium obtained with manufacture method of the present invention, compared with the plating epithelium obtained by manufacture method in the past, is added the quantity of the crackle that man-hour produces, width reduces, thus can improve the erosion resistance of processing department.
In addition, when above-mentioned maintenance temperature is less than 250 DEG C, or when the above-mentioned hold-time is less than 5 seconds, the sclerosis of melting plating epithelium is fast, strain cannot be liberated fully, being separated of rich Al phase and rich Zn phase cannot be carried out, therefore cannot obtain required processibility.On the other hand, consider from the relation with above-mentioned metal sticking, not preferred above-mentioned maintenance temperature is greater than 375 DEG C, and when the above-mentioned hold-time is greater than 60 seconds, the hold-time is long, is therefore not suitable for the manufacture in the melting plating equipment of continous way.
In addition, from the aspect realizing more excellent processibility, said temperature keeps the maintenance temperature of the coated steel sheet in operation to be preferably 300 ~ 375 DEG C, is more preferably 350 ~ 375 DEG C.
Equally, the hold-time of above-mentioned melting coated steel sheet is preferably 5 ~ 30 seconds, is more preferably 5 ~ 20 seconds.
In addition, in manufacture method of the present invention, be not particularly limited after operation is kept to said temperature, conventionally can manufacture melting Al-Zn system coated steel sheet.Such as, as shown in Figure 1, can melting Al-Zn system coated steel sheet surface after temperature keeps operation, formed and change into process epithelium (changing into treatment process), or in coating apparatus, form film (film formation process) separately.
Change into process epithelium for above-mentioned, such as, steel billet temperature can be carried out when not washing become the chromic salt process of the drying treatment of 80 ~ 300 DEG C or Chrome-free changes into process and formed by coating chromate treating solution or Chrome-free chemical synthesis treatment liquid.These change into process epithelium can be individual layer also can be multilayer, in the case of multiple layers, processes as long as carry out multiple changing into successively.
In addition, as the formation method of above-mentioned film, roller coating machine coating, curtain flow coat cloth, spraying etc. can be enumerated.Coating, containing after the coating of organic resin, can utilize the methods such as warm air drying, infrared heating, induction heating carry out heat drying and form film.
(melting Al-Zn system coated steel sheet)
Then, melting Al-Zn system of the present invention coated steel sheet is described.
Melting Al-Zn system coated steel sheet as object of the present invention is the melting Al-Zn system coated steel sheet with the plating epithelium obtained by above-mentioned manufacture method.The feature of this plating epithelium is, is made up of the interface alloy layer existed at the interface with base steel sheet and the upper strata existed thereon.This upper strata has following composition: the Al containing 20 ~ 95 quality % and this Al content less than 10% Si, rest part by Zn and inevitably impurity form.In addition, the Vickers' hardness average out to 50 ~ 100Hv of above-mentioned plating epithelium.In addition, the mean sizes of the zinc flower of above-mentioned plating epithelium is preferably below 0.5mm.
Consider from the balance of erosion resistance and operating aspect, the Al content on above-mentioned upper strata is 20 ~ 95 quality %, is preferably 45 ~ 85 quality %.If the Al content on plating upper strata is more than 20 quality %, then the dendroid of Al is caused to solidify.Thus, Zn is contained primarily of supersaturation in upper strata, and the part in the part of being solidified by Al dendroid and remaining dendroid space is formed, and this dendroid solidifies the structure partly taked at the stacked excellent corrosion resistance of the film thickness direction of plating epithelium.In addition, the dendroid of this Al is stacked more, then corrosion is carried out path and become more complicated, and corrosion is more difficult to easily arrive base steel sheet, and therefore erosion resistance improves.In order to obtain high erosion resistance, more preferably the Al content on upper strata is set to more than 45 quality %.On the other hand, if the Al content on upper strata is greater than 95 quality %, then content Fe to the Zn sacrificing corrosion protection effect tails off, and erosion resistance is deteriorated.Therefore, the Al content on upper strata is set to below 95 quality %.In addition, if the Al content on upper strata is below 85 quality %, then the adhesion amount of plating tails off, and sacrifices corrosion protection effect, can obtain sufficient erosion resistance even if also have Fe when steel matrix is easily exposed.Therefore, the Al content on plating upper strata is preferably set to below 85 quality %.
In addition, Si improves for the purpose of erosion resistance, processibility to suppress the growth of the interface alloy layer formed at the interface with base steel sheet and is added in plating bath, inevitably containing in plating upper strata.Specifically, when Al-Zn system coated steel sheet, if contain Si and carry out plating, then while steel plate impregnated in plating bath in plating bath, Al, Si in bath and the Fe of surface of steel plate carry out alloying reaction, form the compound of Fe-Al system and/or Fe-Al-Si system.By the formation of this Fe-Al-Si system interface alloy layer, the growth of interface alloy layer is suppressed.If the Si content of plating bath is more than 3% of Al content, then can suppress the growth of interface alloy layer fully, be therefore preferred.On the other hand, when the Si content of plating bath is greater than 10% of the Al content of plating bath, the upper strata of the plating epithelium formed becomes the travel path of crackle, and the Si phase that processibility is reduced easily is separated out.Therefore, the Si content in plating bath is set to less than 10% of the Al content in plating bath.Therefore, as noted above, the composition on plating upper strata forms almost identical with plating bath, and therefore the Si content on plating upper strata is set to less than 10% of the Al content on plating upper strata.
In addition, preferred above-mentioned plating upper strata contain add up to 0.01 ~ 10 quality % be selected from Mn, V, Cr, Mo, Ti, Sr, Ni, Co, Sb and B one or two or more kinds.This is because the effect that the carrying out that make the stability of corrosion product improve, make corrosion postpone can be played.
In addition, above-mentioned interface alloy layer is present in the interface with base steel sheet, as mentioned above, is that the Fe of surface of steel plate carries out alloying reaction and the compound of the Fe-Al system that must be formed and/or Fe-Al-Si system with Al, the Si in bath.This interface alloy layer, due to hard and crisp, becomes the starting point that the crackle that adds man-hour produces very thickly when therefore growing, thus preferably thin as much as possible.
Here, interface alloy layer and upper strata can by the cross sections using scanning electron microscope etc. to observe the plating epithelium through grinding and/or etch.The Ginding process in cross section, engraving method have multiple, but generally speaking, as long as the method used when observing plating epithelium cross section, are just not particularly limited.In addition, as long as the observation condition utilizing scanning electron microscope is such as acceleration voltage 15kV, and reflected electron image is the multiplying power of more than 1000 times, just can observe alloy layer and upper strata clearly.
In addition, for whether there is one or two or more kinds that be selected from Mn, V, Cr, Mo, Ti, Sr, Ni, Co, Sb and B in upper strata, can confirm by such as plating epithelium being carried out through analysis with glow discharge apparatus for analyzing luminosity.But, use glow discharge apparatus for analyzing luminosity to be an example after all, as long as the method having distribution-free of Mn, V, Cr, Mo, Ti, Sr, Ni, Co, Sb and the B in plating upper strata can be investigated, just also can use other method.
In addition, one or two or more kinds in the above-mentioned Mn of being selected from, V, Cr, Mo, Ti, Sr, Ni, Co, Sb and B preferably forms one or two or more kinds and intermetallic compound that are selected from Zn, Al and Si in above-mentioned plating upper strata.In the process forming plating epithelium, rich Al compares rich Zn phase and solidifies in advance, is therefore discharged from rich Al phase by process of setting at plating upper strata intermetallic compound and concentrates on rich Zn phase.Rich Zn compares rich Al phase and corrodes in advance, if the rich Zn phase that therefore this intermetallic compound is formed is corroded, then in corrosion product, takes in one or two or more kinds being selected from Mn, V, Cr, Mo, Ti, Sr, Ni, Co, Sb and B.Its result, more effectively can realize the stabilization of the corrosion product in the initial stage of corroding.In addition, when above-mentioned intermetallic compound contains Si, intermetallic compound absorbs the Si in plating epithelium, residue Si in plating upper strata reduces, its result, can prevent the decline being formed caused bendability by non-solid solution Si (Si phase) on plating upper strata, therefore further preferably.
In addition, as confirming the above-mentioned Mn of being selected from, whether one or two or more kinds in V, Cr, Mo, Ti, Sr, Ni, Co, Sb and B form the method for one or two or more kinds and the intermetallic compound be selected from Zn, Al and Si, has following methods.Can use and utilize Wide angle X-ray diffraction detect the method for these intermetallic compounds or transmission electron microscope, utilize electron rays diffraction to detect the methods etc. such as the cross section of plating epithelium from the surface of coated steel sheet.In addition, even the method beyond them, as long as can detect the method for above-mentioned intermetallic compound, any method all can use.
And then the mean sizes of the zinc flower that melting Al-Zn system of the present invention coated steel sheet is preferably formed on plating epithelium is below 0.5mm.This is because, by making zinc flower size fine, the identification of zinc flower can be reduced, improve appearance uniformity.When especially forming the film of high gloss on coated steel sheet, the effect suppressing zinc flower emersion can be brought.
Here, for the mean sizes of above-mentioned zinc flower, use the coating surface of the shooting samples such as opticmicroscope, captured photo (image) marks arbitrary straight line, count the quantity of the zinc flower crossing this straight line, by the quantity (quantity of the length/zinc flower of straight line) of the length of straight line divided by zinc flower, thus average spangle size can be obtained.
In addition, the Vickers' hardness average out to 50 ~ 100Hv of the plating epithelium of melting Al-Zn system of the present invention coated steel sheet.Here, the Vickers' hardness of plating epithelium refers to the Vickers' hardness on plating upper strata.
By the Vickers' hardness of above-mentioned plating epithelium being set to such soft of average below 100Hv, carry out bending etc. adding man-hour, plating epithelium can follow base steel sheet, can suppress the generation of crackle, its result, even if also can guarantee in bending machining portion and the erosion resistance of flat part with degree.In addition, the lower limit of above-mentioned Vickers' hardness being set to 50Hv is to prevent the plating epithelium when forming process to be adhered to the situation of mould etc.
And then the adhesion amount of the plating epithelium of melting Al-Zn system of the present invention coated steel sheet is preferably one side 35 ~ 150g/m
2.If 35g/m
2above, then excellent erosion resistance can be obtained, if 150g/m
2below, then excellent processibility can be obtained.
And then above-mentioned coated steel sheet can be formed in its surface and have the surface treated steel plate changing into process epithelium and/or film further.
Embodiment
Then, embodiments of the invention are described.
The cold-rolled steel sheet of the thickness of slab 0.35mm manufactured in ordinary method is used as base steel sheet, in continous way melting plating equipment, carries out the manufacture of the melting Al-Zn system coated steel sheet becoming sample.By the cooling time of the steel plate after the composition of plating bath and plating, be shown in table 1 by the condition of the maintenance temperature and time of the coated steel sheet after top roll and the composition on plating upper strata.
In addition, for the manufacture of whole melting Al-Zn systems coated steel sheet becoming sample, the bath temperature of plating bath is set to 600 DEG C, plating adhesion amount is set to one side 75g/m
2, i.e. two sides 150g/m
2.
(mean sizes of the zinc flower of plating epithelium)
To each sample optics microscope photographing coating surface of melting Al-Zn system coated steel sheet, photo at random marks the straight line of 10 10mm, count the quantity of the zinc flower crossing this straight line, calculate the length=zinc flower size of every 1 zinc flower.Calculation result is shown in table 1.
(Vickers' hardness of plating epithelium)
For each sample of melting Al-Zn system coated steel sheet, behind grinding plating epithelium cross section, use micro Vickers, with load 5g, the optional position of the upper layer side of plating epithelium is measured to the Vickers' hardness of each 20 from cross-wise direction.The mean value of 20 that calculating measures is as the hardness of plating epithelium.Calculation result is shown in table 1.
[table 1]
(erosion resistance evaluation)
(1) flat part erosion resistance is evaluated
To each sample of melting Al-Zn system coated steel sheet, carry out salt spray testing according to JIS Z2371-2000.Measure the time till each sample generation red rust, evaluate according to following benchmark.Evaluation result is shown in table 2.
Zero: red rust generation time >=2500 hour
×: red rust generation time < 2500 hours
(2) bending machining portion erosion resistance is evaluated
For each sample of melting Al-Zn system coated steel sheet, clip the plate of 4 identical thicknesss of slab in inner side and after implementing 180 ° of bending processing (4T bends), carry out salt spray testing in bending outside according to JISZ2371-2000.Measure the time till each sample generation red rust, evaluate according to following benchmark.Evaluation result is shown in table 2.
Zero: red rust generation time >=2500 hour
×: red rust generation time < 2500 hours
(appearance uniformity evaluation)
Evaluate according to the mean sizes of following benchmark to the zinc flower of each sample of melting Al-Zn system coated steel sheet.Evaluation result is shown in table 2.
Zero: the mean sizes≤0.5mm of zinc flower
△: zinc flower mean sizes > 0.5mm
[table 2]
Table 2
From table 1 and 2 result, each sample of example of the present invention is compared with each sample of comparative example, and plating epithelium is soft.
In addition, although the erosion resistance of known flat part does not have large difference, each sample of example of the present invention compared with each sample of comparative example, the excellent corrosion resistance in bending machining portion.
And then known in each sample of example of the present invention, do not carry out the sample 1 cooled rapidly after plating compared with other the present invention's example sample, zinc flower size is large.
Utilizability in industry
According to the present invention, can obtain having the erosion resistance of good flat part and the melting Al-Zn system coated steel sheet that the erosion resistance of processing department is also excellent due to good processibility, the field widely centered by building materials field can be applied to.
Claims (9)
1. a manufacture method for melting Al-Zn system coated steel sheet, is characterized in that, in continous way melting plating equipment, is kept 5 ~ 60 seconds by the steel plate after melting plating at the temperature of 250 ~ 375 DEG C.
2. the manufacture method of melting Al-Zn system as claimed in claim 1 coated steel sheet, is characterized in that, the steel plate after described melting plating was cooled within 5 seconds the bath temperature-80 DEG C of plating bath from the bath temperature-20 DEG C of plating bath.
3. the manufacture method of melting Al-Zn system as claimed in claim 2 coated steel sheet, is characterized in that, be set within 3 seconds the cooling time of described coated steel sheet.
4. the manufacture method of the melting Al-Zn system coated steel sheet according to any one of claims 1 to 3, is characterized in that, the maintenance temperature of described coated steel sheet is 300 ~ 375 DEG C.
5. the manufacture method of the melting Al-Zn system coated steel sheet according to any one of Claims 1 to 4, is characterized in that, the hold-time of described coated steel sheet is 5 ~ 30 seconds.
6. the manufacture method of the melting Al-Zn system coated steel sheet according to any one of Claims 1 to 5, is characterized in that, described coated steel sheet is cooled to less than 375 DEG C taking a step forward of contacting with top roll.
7. a melting Al-Zn system coated steel sheet, is characterized in that, has the plating epithelium obtained by the manufacture method according to any one of claim 1 ~ 6,
Described plating epithelium is made up of the interface alloy layer existed at the interface with base steel sheet and the upper strata existed over the alloyed layer, this upper strata has following composition: the Al containing 20 ~ 95 quality % and this Al content less than 10% Si and rest part be made up of Zn and inevitable impurity, the Vickers' hardness average out to 50 ~ 100Hv of described plating epithelium.
8. melting Al-Zn system as claimed in claim 7 coated steel sheet, is characterized in that, in described upper strata, further containing add up to 0.01 ~ 10 quality % to be selected from Mn, V, Cr, Mo, Ti, Sr, Ni, Co, Sb and B one kind or two or more.
9. melting Al-Zn system as claimed in claim 7 or 8 coated steel sheet, is characterized in that, the mean sizes of the zinc flower of described plating epithelium is below 0.5mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-017834 | 2013-01-31 | ||
| JP2013017834A JP6001469B2 (en) | 2013-01-31 | 2013-01-31 | Fused Al-Zn plated steel sheet and method for producing the same |
| PCT/JP2014/000341 WO2014119263A1 (en) | 2013-01-31 | 2014-01-23 | HOT-DIP Al-Zn GALVANIZED STEEL PLATE AND METHOD FOR PRODUCING SAME |
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|---|---|
| CN104955976A true CN104955976A (en) | 2015-09-30 |
Family
ID=51261981
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480006168.1A Pending CN104955976A (en) | 2013-01-31 | 2014-01-23 | HOT-DIP Al-Zn GALVANIZED STEEL PLATE AND METHOD FOR PRODUCING SAME |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP6001469B2 (en) |
| KR (1) | KR20150097763A (en) |
| CN (1) | CN104955976A (en) |
| AU (1) | AU2014212962B2 (en) |
| TW (1) | TWI521092B (en) |
| WO (1) | WO2014119263A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483591A (en) * | 2015-12-23 | 2016-04-13 | 常州大学 | Zn-Al-Si-Ni alloy plating layer for hot dipping and hot dipping method |
| CN109402452A (en) * | 2018-12-07 | 2019-03-01 | 株洲冶炼集团股份有限公司 | A kind of hot dip kirsite |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017060745A1 (en) | 2015-10-05 | 2017-04-13 | Arcelormittal | Steel sheet coated with a metallic coating based on aluminium and comprising titanium |
| KR102153164B1 (en) | 2017-12-26 | 2020-09-07 | 주식회사 포스코 | Plated steel for hot press forming and forming part by using the same |
| WO2019131385A1 (en) * | 2017-12-26 | 2019-07-04 | Nippon Steel Nisshin Co., Ltd. | Hot-dip aluminized steel sheet and method of producing the same |
| KR102311503B1 (en) | 2019-12-20 | 2021-10-13 | 주식회사 포스코 | Aluminium alloy plate steel sheet having excellent formability and corrosion resistance and method for manufacturing the same |
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-
2013
- 2013-01-31 JP JP2013017834A patent/JP6001469B2/en active Active
-
2014
- 2014-01-23 AU AU2014212962A patent/AU2014212962B2/en not_active Ceased
- 2014-01-23 CN CN201480006168.1A patent/CN104955976A/en active Pending
- 2014-01-23 KR KR1020157019616A patent/KR20150097763A/en not_active Ceased
- 2014-01-23 WO PCT/JP2014/000341 patent/WO2014119263A1/en active Application Filing
- 2014-01-29 TW TW103103335A patent/TWI521092B/en not_active IP Right Cessation
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| EP0028821A1 (en) * | 1979-11-08 | 1981-05-20 | Bethlehem Steel Corporation | Method of improving the ductility of the coating of an aluminum-zinc alloy coated ferrous product |
| EP0028821B1 (en) * | 1979-11-08 | 1984-07-04 | Bethlehem Steel Corporation | Method of improving the ductility of the coating of an aluminum-zinc alloy coated ferrous product |
| JP2001164350A (en) * | 1999-12-09 | 2001-06-19 | Daido Steel Sheet Corp | Method for manufacturing aluminum-zinc alloy plated steel sheet |
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| JP4669385B2 (en) * | 2005-12-15 | 2011-04-13 | 新日本製鐵株式会社 | Steel strip cleaning method in pickling line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105483591A (en) * | 2015-12-23 | 2016-04-13 | 常州大学 | Zn-Al-Si-Ni alloy plating layer for hot dipping and hot dipping method |
| CN105483591B (en) * | 2015-12-23 | 2018-12-07 | 常州大学 | Zn-Al-Si-Ni alloy layer and hot dip coating method used for hot dip galvanizing |
| CN109402452A (en) * | 2018-12-07 | 2019-03-01 | 株洲冶炼集团股份有限公司 | A kind of hot dip kirsite |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2014212962B2 (en) | 2016-07-21 |
| JP6001469B2 (en) | 2016-10-05 |
| TW201432091A (en) | 2014-08-16 |
| JP2014148715A (en) | 2014-08-21 |
| TWI521092B (en) | 2016-02-11 |
| WO2014119263A8 (en) | 2015-07-30 |
| KR20150097763A (en) | 2015-08-26 |
| WO2014119263A1 (en) | 2014-08-07 |
| AU2014212962A1 (en) | 2015-07-23 |
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