CN104046892A - Cold-rolled hot-dipped Al-Zn steel plate for kinescope explosion-proof band and production method thereof - Google Patents
Cold-rolled hot-dipped Al-Zn steel plate for kinescope explosion-proof band and production method thereof Download PDFInfo
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- 229910018573 Al—Zn Inorganic materials 0.000 title abstract 4
- 238000005097 cold rolling Methods 0.000 claims abstract description 42
- 238000005096 rolling process Methods 0.000 claims abstract description 27
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- 238000005266 casting Methods 0.000 claims abstract description 4
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- 238000007670 refining Methods 0.000 claims abstract description 4
- 229910052786 argon Inorganic materials 0.000 claims abstract description 3
- 239000002893 slag Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 36
- 238000004880 explosion Methods 0.000 claims description 17
- 238000005269 aluminizing Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 13
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- 239000012535 impurity Substances 0.000 claims description 7
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- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
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- 229910052799 carbon Inorganic materials 0.000 claims description 5
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- 238000009749 continuous casting Methods 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 238000003303 reheating Methods 0.000 abstract description 4
- 229910000885 Dual-phase steel Inorganic materials 0.000 abstract description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 abstract description 2
- 239000008397 galvanized steel Substances 0.000 abstract description 2
- 238000003723 Smelting Methods 0.000 abstract 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Abstract
The invention relates to a cold-rolled hot-dipped Al-Zn steel plate for a kinescope explosion-proof band and a production method thereof, and solves the technical problems of low strength and easy powdering in current cold-rolled hot galvanized steel plates and the problems of complex manufacturing process and high production cost in microalloy dual phase steel plates and cold-rolled high strength Al-Zn steel plates. The production method includes: conducting smelting according to components, carrying out molten iron desulphurization, converter top-bottom combined blowing, steel ladle bottom argon blowing or LF furnace refining, protective slag Ar blowing protective casting, slab reheating furnace heating, descaling, rough rolling, finish rolling, and reeling in order to obtain a hot rolled steel coil, then performing uncoiling again, and conducting pickling, cold rolling, horizontal continuous annealing furnace annealing, hot dipping, drawing straightening and reeling, thus obtaining a finished product. The cold-rolled hot-dipped Al-Zn steel plate provided by the invention has a single-side hot-dipped Al55Zn43Si1.6 layer with a thickness of 35-45g/m<2>, a single-side chromate-free passivation coating film with a thickness of less than 1micrometer, and yield strength of 420-500MPa.
Description
Technical field
The present invention relates to a kind of cold rolling hot dip process steel plate and production method thereof, particularly a kind of cold rolling hot-dip aluminizing zincium steel plate and production method thereof for picture tube anti explosion band.
Background technology
The main developing countries of television picture tube TV set and display screen and special industry application at present, approximately 5000 tons/year of the domestic thin plate steel market demands of manufacturing for picture tube anti explosion band, domestic only Baosteel, Wuhan Iron and Steel Plant are produced implosion prevention band steel.
Heat-resisting, anti-corrosion, the good weldability of material require for implosion prevention band.The implosion prevention band machining process of a new generation comprises: the implosion prevention band itemize of finished product volume is become to suitable rouleau, then cut into suitable section material, get 4～6 convex closures, for follow-up spot welding is prepared simultaneously; The deburring of section material, bending; Strip material is converted into rectangular box, and has the gradient of 3 °, and leave certain scrap (bridge), allow 4～6 convex closures be positioned at scrap (bridge) mid-way, be uniformly distributed; Adopt resistance spot welding mode to weld convex closure, be prefabricated into rectangle frame; Adopt resistance spot welding mode at 4 earrings of implosion prevention band four welded corner joint; Dilatometry is generally heated to 350～450 ℃, after heating, the explosion-proof strap of rectangle frame is carried out cooling on picture tube.
Chinese patent CN99120043.8 discloses the invention of Wuhan Iron and Steel Plant company and " has made explosion-resistant band of color kinescope alloyed hot-dip galvanized steel sheet ", this invention has proposed to produce substrate composition and the production method of steel for explosion-resistant band of color kinescope, by the production technique of common alloying galvanizing plate, employing off-line is smooth, the smooth unit elongation of strict control, carries out grinding-polishing, texturing processing to leveling roll in addition.This invention technical characteristics also comprises: the matrix composition of steel (mass percent) is C0.005%～0.03%, Si0～0.03%, Mn0.1%～0.25%, P0.006%～0.025%, S0.005%～0.02%%, Als:0.015%～0.065%; Production method forms Zn-Fe alloy coating after mainly comprising the pot galvanize of cold continuous rolling coil of strip, and the unit elongation off-line unit of employing 0.4%～1.2% is smooth.This technology application alloyed hot-dip zinc technology, product surface is coarse, need off-line smooth, this coating is also easy efflorescence in the course of processing, steel C used, Mn content are low in addition, and the strength of materials is lower, for implosion prevention band, must increase material thickness, this feature obvious and implosion prevention band " high-strength, lightweight " is runed counter to.
Chinese patent CN200480013608.2 discloses French Xi Na company invention " for the aluminize manufacture method of high resistance metal sheet and this metal sheet of the cold rolling two-phase of televisor implosion prevention band ", its invention technical characterictic is: this invention relates to a kind of cold rolling two-phase metal sheet, this metal sheet can be used to manufacture the implosion prevention band of used as television, its chemical constitution by weight percentage, comprise 0.03%≤C≤0.3%, 1%≤Mn≤3%, 0.05%≤Si≤2%, 0.02%≤Al≤2%, 0.02%≤Cr≤1%, Mo≤1%, S≤0.02%, P≤0.2%, N≤0.01% and be selected from Ti, V, Zr, one or more elements in Nb, above-mentioned each constituent content is in 0.001% to 0.2% scope, all the other compositions of described chemical constitution are the impurity producing in iron and production.Slab or the ingot with the steel of above-mentioned chemical constitution are heated at the temperature of 1100-1300 ℃; Hot rolling slab or ingot, make temperature when hot rolling finishes higher than the Ar3 temperature of steel; Speed with 1-500 ℃/s is carried out cooling; Then the described steel sheet of reeling at 300-720 ℃ of temperature.After cold rolling, metal sheet is annealed under the temperature T m higher than Ac1; To be greater than the speed of 2 ℃/s, metal sheet is cooled to and reaches the service temperature of aluminizing; At 650-720 ℃, in aluminium base molten bath, make subsequently metal sheet sclerosis, then to be greater than the speed of 2 ℃/s, be cooled to room temperature.The microstructure of steel is by ferrite and 5-30% martensite and be less than 2% Carbide Phases and form.The steel matrix of this invention is microalloy dual phase steel, and need to aluminize, although intensity is high, material produce processing requirement is high, cost is high.
Chinese patent CN200380100313.4 discloses Japanese Jfe Steel Corp, Sony Corp " steel plate and high strength anti-explosion band for high strength anti-explosion band ", its invention technical characterictic is: the matrix composition of steel (mass percent) is that below C0.001～0.05%, Si0.2～1%, Mn0.5～2.3%, P0.02～0.12%, O0.005%, below S0.020%, below N0.005%, the mean diameter of ferrite crystal grain is 10～25 μ m.This invention belongs to Si, Mn strengthening steel, and as needs hot dip process, the Si that content is high reduces the wetting property in matrix and molten bath, and binding force of cladding material is poor.
Chinese patent CN200680004370.6 discloses Nippon Steel Manufacturing Corp's " aluminum type plated steel sheet and adopt its implosion prevention band ", and its invention technical characterictic is: the invention provides a kind of can melanism after reheating and can prevent the resistance to melanism of strength decreased and the aluminum type plated steel sheet of welding property excellent and adopted the implosion prevention band of this aluminum type plated steel sheet yet.This implosion prevention band forms by steel plate having been implemented to take the aluminum type plated steel sheet that aluminium class plating that Al is main body obtains, and melanism and strength decreased in the time of can preventing from reheating 500 ℃～700 ℃, the composition of described steel plate (mass percent) for C:0.005% is following, N:0.005% is following, Si:0.1%～0.5%, P:0.1% is following, S:0.02% is following, Mn:1.05%～2.0%, solid solution Al:1.0% are following, surplus is Fe and inevitable impurity.Melanism and strength decreased when although this invention can prevent from reheating 500 ℃～700 ℃, material manufacture difficulty is large, because Si content is high, reduces the wetting property in matrix and molten bath, and binding force of cladding material is poor, and hot plating technology requires high.
In prior art, lack and have heat-resisting, anti-corrosion, good welds performance, product strength is moderate, and manufacturing process is relatively simple, is applicable to the cold rolling hot-dip aluminizing zincium steel plate for picture tube anti explosion band of 350～450 ℃ of thermal expansion assemblings.
Summary of the invention
The object of this invention is to provide a kind of cold rolling hot-dip aluminizing zincium steel plate and production method thereof for picture tube anti explosion band, solve lower, the easy efflorescence of intensity that existing cold rolling hot dip galvanizing steel plate exists and microalloy dual phase sheet steel, cold rolling high-strength Aludip manufacturing process is complicated, production cost is high technical problem.
The technical solution used in the present invention is:
A kind of cold rolling hot-dip aluminizing zincium steel plate for picture tube anti explosion band, chemical composition mass percent: C:0.05%～0.095%, Si:0～0.03%, Mn:0.7%～0.98%, P≤0.015%, S≤0.012%, Alt:0.025%～0.065%, a kind of or two kinds of elements in Nb, Ti, above-mentioned each constituent content sum is: 0.025%～0.04%, surplus is Fe and inevitable impurity element.
Picture tube anti explosion band of the present invention is limited to the reasons are as follows in above-mentioned scope by the chemical composition of hot-dip aluminizing zincium steel plate:
Carbon: suitably increase the C content in steel, can reduce Mn content, reduce Ar3 transformation temperature, prevent that finish rolling is in two-phase region rolling, contribute to improve plate shape, be conducive to low-cost suitable yield strength and the higher unit elongation of obtaining, guarantee the intensity of material and the economy of material.Therefore, C content range of the present invention is set as 0.05%～0.095%;
Silicon: in soft steel aluminium killed steel, by aluminium deoxidation, can reduce Si content, the too low cost that can improve steel-making refining procedure of Si content; Increase Si content, reduce plasticity and the hot dip process performance of cold-rolled steel sheet.Technical solution of the present invention is set Si content 0～0.03%;
Manganese: Mn act as solution strengthening, improves intensity in steel, and as punching press material, if Mn too high levels, the strength of materials increases, and annealing difficulty increases, and economy declines.It is 0.7%～0.98% that technical solution of the present invention is set Mn content range;
Phosphorus: P is generally solid-solubilized in ferrite, there is very strong solution strengthening effect, phosphorus also has serious segregation tendency, and in perlite and ferrite, diffusion is very slow, is not easy homogenizing and produces phosphorous segregation, and banded structure increases the weight of, phosphorus strengthens the solution strengthening effect of steel, the intensity of steel plate and hardness raise, and plasticity and toughness sharply decline, and welding property degenerates.Technical solution of the present invention is set P≤0.015%;
Sulphur: in Pressing Deformation process, first sulfide inclusion occurs cracking as stress raiser, or makes to be mingled with the trickle hole of generation separated with metallic matrix, and these holes are constantly grown up with deformation process, further expands and causes steel plate cracking.For guaranteeing certain processing characteristics, require to reduce the sulphur content in steel.Technical solution of the present invention is set S≤0.012%;
Aluminium: due to Si content seldom, steel-making adopts aluminium element deoxidation, abundant in order to guarantee deoxidation, according to a large amount of knowhows, set aluminium content under be limited to 0.025%.When Al measures when too high, can increase cost of alloy, and to continuous casting casting cycle is had to certain influence, the oxide compound Al2O3 that also can form in addition too much deoxidation products Al is mingled with.Al content range of the present invention is set as 0.025%～0.065%.
Niobium and titanium: as common microalloy strengthening element, can obviously improve the over-all properties of steel.Ti is very strong solid N element, the Ti that utilizes 0.02% left and right is the fixing N below 0.006% in steel just, form the TiN precipitated phase of tiny high-temperature stable, Austenite Grain Growth when this tiny TiN particle can hinder high temperature effectively, add microalloy element Nb, can stop grain growth, crystal grain thinning, improves product mechanical property.One or both constituent content sums that technical solution of the present invention is set in Nb, Ti are 0.025%～0.04%.
A kind of production method of the cold rolling hot-dip aluminizing zincium steel plate for picture tube anti explosion band, by following composition quality per-cent, smelt: C:0.05%～0.095%, Si:0～0.03%, Mn:0.7%～0.98%, P≤0.015%, S≤0.012%, Alt:0.025%～0.065%, a kind of or two kinds of elements in Nb, Ti, above-mentioned each constituent content sum is: 0.025%～0.04%, surplus is Fe and inevitable impurity element; Adopt successively desulfurizing iron, converter top bottom blowing, steel ladle bottom argon blowing or the refining of LF stove, covering slag to blow Ar protective casting, bar plate heating stove heating, de-scaling, roughing, finish rolling, batch acquisition coils of hot-rolled steel, then uncoiling again, through pickling, cold rolling, Horizontal Continuous Furnace annealing, hot dip process, straightening, batch and obtain finished product.It is characterized in that:
1, the carbon content in steel is set
Increase the C content in steel, can reduce Mn content, reduce Ar3 transformation temperature, prevent that finish rolling from, in two-phase region rolling, contributing to improve plate shape.C content range of the present invention is set as 0.05%～0.095%.
2, finish rolling end temp is set
For preventing that finish rolling is in two-phase region rolling, finishing temperature will be set high; But consider refine austenite grain fineness number and reduce the factor that precipitate is grown up, finishing temperature again can not be too high.Consider, finish rolling end temp of the present invention is set as 860 ℃～900 ℃.
3, hot rolling reeling Temperature Setting
The tissue of hot rolling reeling temperature major effect material, performance and cold rolling after company move back recrystallization temperature and stamping performance.If adopt lower coiling temperature, material recrystallization temperature improves, and is unfavorable for the carrying out of subsequent anneal, and end of reel temperature fluctuation is large, the more difficult control of temperature homogeneity, is unfavorable for improving the homogeneity of material property; If coiling temperature is higher, be unfavorable for follow-up pickling, grain growth, precipitate alligatoring, although material yield intensity is lower.Consider, it is 580 ℃～620 ℃ that the present invention sets coiling temperature.
4, cold rolling draft is set
Along with the raising of cold rolling draft, the deformation energy of storing in steel plate increases, and increases recrystallize motivating force, is conducive to the carrying out of annealing process.Cold rolling draft is too low, and the thickness of supplied materials coils of hot-rolled steel is inevitable thinner, to the plate shape of material, homogeneity of structure, controls all more difficult; But if cold rolling draft is too high, can obviously increase cold rolling mill load, be unfavorable for the stably manufactured of rolling, increased production difficulty.Consider, the present invention preferably cold rolling draft is 70%～80%, cold-rolled products thickness 0.65～1.15mm.
5, annealing temperature is set
Recrystallization annealing is cold rolling rear control and the necessary means that changes metal material tissue, texture and performance.Recovery and recrystallization and three processes of grain growth that hard steel experiences in annealing process of rolling after cold rolling all have influence on end properties.Acquisition plate shape, the product that mechanical property requirements is high, the continuous annealing method of the first naked light preheating of the front use of hot dip process Horizontal Continuous Furnace, rear radiation soaking, the present invention sets with steel at the preheating section of Horizontal Continuous Furnace, the belt steel temperature scope of soaking zone outlet is respectively 640 ℃～660 ℃, 760 ℃～780 ℃, and the annealing time with steel in Horizontal Continuous Furnace is set as 90s～120s according to thickness.
6, coating and post-treatment coatings gauge control
Al55Zn43Si1.6 corrosion resistance coating, higher than pot galvanize and alloyed zinc hot dip galvanized, has good resistance spot welding performance after meeting product hot dip process, is meeting under the prerequisite of implosion prevention band good corrosion resistance, reduces aluminium-zinc coating and post-treatment coatings thickness as far as possible.Post-treatment coatings adopts chromium-free deactivation coating, and chromium-free deactivation coating has 500～570 ℃ of high-temperaure coatings and common coating, and the present invention uses any one chromium-free deactivation coating, and can reduce thickness, improves resistance spot welding performance.It is 35～45g/m2 that the present invention sets product one side Al55Zn43Si1.6 thickness of coating, and one side chromium-free deactivation coating film thickness is for being less than 1 μ m.
7, straightening unit elongation is set
After hot dip process, with steel, through straightening, can improve the plate shape of product.Steel plate after hot dip process of the present invention batches and obtains finished product after straightening, and after hot dip process, steel plate straightening unit elongation is 0.3%～0.5%.
The present invention has following positively effect compared to existing technology:
The present invention is by the Composition Design of the low silicomanganese of middle carbon, mate suitable hot rolling, cold rolling, annealing process, control coating and post-treatment coatings thickness, the hot dip process Al55Zn43Si1.6 Coated Steel that acquisition yield strength is 420～500MPa, heat-resisting, anti-corrosion and good welds performance that material has, be applicable to 350～450 ℃ of thermal expansion assemblings, met picture tube anti explosion band product demand, immersion is relatively simple, low cost of manufacture, can substitute existing alloyed zinc hot dip galvanized and high-strength hot and aluminize and two-phase high-strength steel.
Accompanying drawing explanation
Accompanying drawing is the metallographic structure photo of the embodiment of the present invention 1 cold rolling hot-dip aluminizing zincium steel plate.
Embodiment
Below in conjunction with embodiment 1～5, the invention will be further described, as shown in table 1～table 4.
Table 1 chemical composition of the present invention (mass percent %), surplus is Fe and inevitable impurity.
| Element | C | Si | Mn | P | S | Alt | Nb or Ti |
| The present invention | 0.05～0.095 | 0～0.03 | 0.7～0.98 | ≤0.015 | ≤0.012 | 0.025～0.065 | 0.025～0.04 |
| Embodiment 1 | 0.052 | 0.015 | 0.95 | 0.0116 | 0.0079 | 0.027 | 0.0338 |
| Embodiment 2 | 0.065 | 0.016 | 0.89 | 0.0095 | 0.0063 | 0.062 | 0.027 |
| Embodiment 3 | 0.075 | 0.011 | 0.83 | 0.0119 | 0.0067 | 0.038 | 0.031 |
| Embodiment 4 | 0.083 | 0.007 | 0.76 | 0.0107 | 0.0095 | 0.051 | 0.036 |
| Embodiment 5 | 0.091 | 0.009 | 0.71 | 0.0083 | 0.0086 | 0.067 | 0.033 |
By converter melting obtain the meeting the requirements continuously cast bloom of chemical composition, thickness is that 210～240mm, width are that 800～1300mm, length are 5000～10000mm.Scale slab is delivered to process furnace and is reheated, and delivers to rolling on Continuous Heat tandem rolling mill after the dephosphorization of coming out of the stove.After roughing milling train and the controlled rolling of finish rolling tandem rolling unit, batch the qualified coils of hot-rolled steel of output.Hot-rolled temperature technology controlling and process is in Table 2.
Table 2 hot-rolled temperature technology controlling and process of the present invention
| Hot Rolling Parameters | Slab heating temperature (℃) | Finish rolling start temperature (℃) | Finish rolling end temp (℃) | Coiling temperature (℃) |
| The present invention | 1180～1220 | 1000～1040 | 860～900 | 580～620 |
| Embodiment 1 | 1200 | 1010 | 880 | 580 |
| Embodiment 2 | 1200 | 1010 | 880 | 600 |
| Embodiment 3 | 1200 | 1010 | 880 | 620 |
| Embodiment 4 | 1200 | 1010 | 880 | 620 |
| Embodiment 5 | 1200 | 1010 | 880 | 620 |
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, on reversible rolling or 5 Stands Cold Tandem Mills, carry out cold rolling, cold rolling draft is 70%～80%, and the steel band that rolls hard state after cold rolling passes through Horizontal Continuous Furnace annealing, hot dip process, straightening, batches the finished product cold-rolled steel strip that obtains thickness 0.65～1.15mm.Annealing process is: steel plate is at the preheating section of Horizontal Continuous Furnace, the temperature range of soaking zone outlet is respectively 640 ℃～660 ℃, 760 ℃～780 ℃, and the annealing time with steel in Horizontal Continuous Furnace is set as 90s～120s according to thickness.Steel plate one side hot dip process Al55Zn43Si1.6 thickness of coating is 35～45g/m
2, steel plate one side chromium-free deactivation coating film thickness is for being less than 1 μ m.Straightening unit elongation after hot dip process is respectively 0.3%～0.5%.Concrete technology is controlled parameter in Table 3.
Table 3 the present invention is cold rolling, straightening elongation control parameter after annealing process, immersion and plating
Utilize the strength property, resistance spot welding stripping damage assay of the cold rolling hot dip process steel sheet product that aforesaid method obtains in Table 4.
The strength property of the cold rolling hot dip process steel sheet product of table 4 the present invention, resistance spot welding stripping damage assay
| Performance index | Yield strength (MPa) | Tensile strength (MPa) | A 80Elongation (%) | The check of resistance spot welding stripping damage |
| Embodiment 1 | 433 | 493 | 26.5 | Qualified |
| Embodiment 2 | 439 | 499 | 28 | Qualified |
| Embodiment 3 | 468 | 510 | 27 | Qualified |
| Embodiment 4 | 472 | 519 | 25.5 | Qualified |
| Embodiment 5 | 483 | 520 | 24.5 | Qualified |
From above-described embodiment, can find out, manufacturing process of the present invention is relatively simple, and the steel plate yield strength of producing is 420～500MPa, has the safety protection function of implosion prevention band; Steel plate one side hot dip process Al55Zn43Si1.6 thickness of coating is 35～45g/m
2, steel plate one side chromium-free deactivation coating film thickness, for being less than 1 μ m, having been saved production cost, has been improved resistance electric welding performance; Hot dip process Al55Zn43Si1.6 corrosion resistance of coating is good, and can meet indoor environment 15～20 years can corrosion, and process costs is lower than cold rolling hot dip galvanizing steel plate and cold rolling high-strength Aludip.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to replaces or the formed technical scheme of equivalent transformation, within being all included in the protection domain of requirement of the present invention.
Claims (4)
1. the cold rolling hot-dip aluminizing zincium steel plate for picture tube anti explosion band, its chemical composition mass percent is: C:0.05%～0.095%, Si:0～0.03%, Mn:0.7%～0.98%, P≤0.015%, S≤0.012%, Alt:0.025%～0.065%, a kind of or two kinds of elements in Nb, Ti, above-mentioned each constituent content sum is: 0.025%～0.04%, surplus is Fe and inevitable impurity element.
2. a kind of cold rolling hot-dip aluminizing zincium steel plate for picture tube anti explosion band as claimed in claim 1, is characterized in that, described cold rolling hot-dip aluminizing zincium steel plate one side hot dip process Al55Zn43Si1.6 thickness of coating is 35～45g/m
2, steel plate one side chromium-free deactivation coating film thickness is for being less than 1 μ m.
3. a kind of cold rolling hot-dip aluminizing zincium steel plate for picture tube anti explosion band as claimed in claim 1, is characterized in that, the yield strength of described cold rolling hot-dip aluminizing zincium steel plate is 420～500MPa.
4. the production method for the cold rolling hot-dip aluminizing zincium steel plate of picture tube anti explosion band, by following composition quality per-cent, smelt: C:0.05%～0.095%, Si:0～0.03%, Mn:0.7%～0.98%, P≤0.015%, S≤0.012%, Alt:0.025%～0.065%, a kind of or two kinds of elements in Nb, Ti, above-mentioned each constituent content sum is: 0.025%～0.04%, surplus is Fe and inevitable impurity element; Adopt successively desulfurizing iron, converter top bottom blowing, steel ladle bottom argon blowing or the refining of LF stove, covering slag to blow Ar protective casting, bar plate heating stove heating, de-scaling, roughing, finish rolling, batch acquisition coils of hot-rolled steel, then uncoiling again, through pickling, cold rolling, Horizontal Continuous Furnace annealing, hot dip process, straightening, batch and obtain finished product; It is characterized in that: continuous casting steel billet Heating temperature is 1180～1220 ℃, in continuous or semicontinuous hot continuous rolling frame, carry out rolling, finish rolling end temp is 860 ℃～900 ℃, after finish rolling, coiling temperature is 580 ℃～620 ℃, cold rolling draft is 70%～80%, the hardboard that rolls after cold rolling is respectively 640 ℃～660 ℃, 760 ℃～780 ℃ in preheating section, the soaking zone annealing region of Horizontal Continuous Furnace, be 90s～120s the heat-up time with steel in Horizontal Continuous Furnace, and straightening unit elongation is 0.3%～0.5%.
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| CN105088067A (en) * | 2015-08-31 | 2015-11-25 | 武汉钢铁(集团)公司 | Coating steel for 380 MPa automotive frame and production method |
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