CN104894475A - Extra-deep-drawing and fingerprint-resistant electro-galvanized sheet and manufacturing method thereof - Google Patents
Extra-deep-drawing and fingerprint-resistant electro-galvanized sheet and manufacturing method thereof Download PDFInfo
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- CN104894475A CN104894475A CN201510340283.9A CN201510340283A CN104894475A CN 104894475 A CN104894475 A CN 104894475A CN 201510340283 A CN201510340283 A CN 201510340283A CN 104894475 A CN104894475 A CN 104894475A
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Abstract
The invention discloses an extra-deep-drawing and fingerprint-resistant electro-galvanized sheet and a manufacturing method thereof. The extra-deep-drawing and fingerprint-resistant electro-galvanized sheet comprises chemical components in percentage by weight as follows: 0.002%-0.004% of C, 0.01%-0.02% of Si, 0.11%-0.16% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.013% of S, 0.05%-0.09% of Ti, 0.02%-0.06% of sol Al, smaller than or equal to 0.005% of N and the balance of Fe and inevitable impurities. The manufacturing method of the extra-deep-drawing and fingerprint-resistant electro-galvanized sheet comprises steps as follows: molten iron desulphurization, converter refining, vacuum treatment, continuous casting, hot continuous rolling, cold rolling, continuous annealing and coiling, wherein the heating temperature for hot continuous rolling is 1,000-1,200 DEG C, the finish rolling temperature is 800-1,000 DEG C, 5 passes of cold rolling are performed after hot continuous rolling, and the cold rolling reduction ratio is controlled in a range from 73% to 83%; the temperature for continuous annealing is 810-840 DEG C, the time for continuous annealing is 15-80 s, and electro-galvanizing and fingerprint resistant treatment is performed after flattening and tension leveling. The electro-galvanized sheet has excellent punching processing and fingerprint resistant performance, the manufacturing method of the electro-galvanized sheet is simple in technological process, and the production cost is low.
Description
Technical field
The invention belongs to Industrial Steels technical field, specifically refer to that a kind of ultra-deep rushes the electrolytic galvanized sheet of resistance to fingerprint and manufacture method thereof.
Background technology
China's electrolytic galvanized sheet is mainly used in high-end household electrical appliances and automotive field, but the high-end kind of electro-galvanizing part still needs a large amount of import, comprising the electro-galvanized steel of the resistance to fingerprint product manufacturing liquid crystal backboard and OA electrical equipment for big scale deep draw.This product had both required to have excellent punching performance, required again to have excellent surface quality and resistance to fingerprint coating performance.Concerning the most of electro-galvanized steel board assembly line of China, this requirement is very harsh, is difficult to the requirement meeting household electrical appliances and automobile industry, and therefore the sector uses import Japan and Korea S electro-galvanized steel product in a large number.Therefore, be badly in need of exploitation ultra-deep and rush the electrolytic galvanized sheet of resistance to fingerprint, meet domestic household electrical appliances, the ever-increasing demand of automobile market.
Prior art is more to electrolytic galvanized sheet report, wherein application number is the patent of invention of 201410745314.4, disclose a kind of liquid crystal module electrolytic galvanized sheet and preparation method thereof, solve available liquid crystal module electrolytic galvanized sheet production cost high, properties needs the problem improved further, the chemical composition (wt%) that this art solutions comprises steel is C:0.008 ~ 0.020, Si≤0.03, Mn:0.10 ~ 0.25, P≤0.015, S≤0.010, solAl:0.02 ~ 0.05, N≤0.005, Ti<0.005, Nb<0.005, all the other are Fe and inevitable impurity, the smelting steel of above-mentioned chemical composition is cast into slab, then hot rolling is carried out, pickling tandem rolling, continuous annealing, smooth, electro-galvanizing, resistance to finger prints processing obtains electrolytic galvanized sheet.The technological method technique of this patent is simple, production cost is low, and the liquid crystal module electrolytic galvanized sheet punching performance of preparation is good, erosion resistance, organic solvent resistance and conduct electricity very well.This product is mainly used in household electrical appliances liquid crystal module and uses, and industrial applicability is less.The patent of invention of application number 201210048878.3, discloses a kind of processing method of continuous seepage nickel-zinc electroplated anti-fingerprint plate, it is characterized in that: first alkaline electro-nickel on Substrate sheet, and then acid electroplating zinc; Concrete steps comprise: (1) Substrate sheet on a production line sequentially through uncoiling, pinch, shear, pinch, sew up, flatten operation after, Substrate sheet is carried out oil removal treatment, is neutral by water cleaning to pH value; (2) steel plate after oil removing and washing being immersed volume ratio is activation rust cleaning in the hydrochloric acid soln of 8 ~ 12%; (3), after steel plate water-washing to the pH value after step (2) process being neutrality, alkaline electro-nickel is carried out; (4) be, after neutrality, carry out acid electroplating zinc by steel plate water-washing to the pH value that step (3) obtains; (5) steel plate obtained after electro-galvanizing is cleaned to pH value through pure water to be neutrality, to be nickel-zinc steel plate, to dry; (6) nickel-zinc steel plate step (5) obtained is through the roller coating machine roller coat liquid of resistance to finger prints processing, and after drying, rolling obtains nickel-zinc electroplated anti-fingerprint plate; Consisting of of step (3) neutral and alkali nickel plating solution: single nickel salt 15 ~ 40g/L, SF-880U 50 ~ 100mL/L, SF-880M 50 ~ 100mL/L, ammoniacal liquor 5 ~ 20mL/L, KOH40 ~ 80g/L; Temperature in step (3) neutral and alkali electronickelling process is 20 ~ 60 DEG C, and pH value controls 8 ~ 11, and current density is 1 ~ 4A/dm
2; The time controling of step (3) neutral and alkali electronickelling was at 3 seconds.This product first at steel plate nickel preplating, then on nickel layer electro-galvanizing, then through resistance to finger prints processing, but the complex manufacturing of this patented method, production difficulty is large, and cost is high.
Therefore, domestic and international researchist is devoted to develop one always and is adapted to household electrical appliances and automotive field ultra-deep rushes the electrolytic galvanized sheet of resistance to fingerprint.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, there is provided a kind of ultra-deep to rush the electrolytic galvanized sheet of resistance to fingerprint and manufacture method thereof, this electrolytic galvanized sheet has excellent punch process and anti-finger printing energy, simultaneously, the manufacturing approach craft flow process of this steel is simple, low production cost.
For achieving the above object, ultra-deep of the present invention rushes the electrolytic galvanized sheet of resistance to fingerprint, its chemical composition is by weight percentage: C:0.002 ~ 0.004, Si:0.01 ~ 0.02, Mn:0.11 ~ 0.16, P≤0.012, S≤0.013, Ti:0.05 ~ 0.09, solAl:0.02 ~ 0.06, N≤0.005, and all the other are Fe and inevitable impurity.
Preferably, the chemical composition of this steel is by weight percentage: C:0.0025 ~ 0.0035, Si:0.012 ~ 0.02, Mn:0.12 ~ 0.14, P≤0.012, S≤0.013, Ti:0.06 ~ 0.07, solAl:0.04 ~ 0.05, N≤0.005, and all the other are Fe and inevitable impurity.
Ultra-deep of the present invention rushes the manufacture method of the electrolytic galvanized sheet of resistance to fingerprint, comprises the following steps: desulfurizing iron, converter smelting, vacuum-treat, continuous casting, hot continuous rolling, cold rolling, continuous annealing, batch, and its special character is:
Described hot continuous rolling Heating temperature 1000 ~ 1200 DEG C, finishing temperature is 800 ~ 1000 DEG C, carries out the cold rolling of 5 passages after described hot continuous rolling, and it is 73 ~ 83% that cold rolling draft controls; Continuous annealing temperature is 810 ~ 840 DEG C, continuous annealing time 15 ~ 80s, then carries out electro-galvanizing, resistance to finger prints processing after smooth, straightening.Described coiling temperature is preferably 600 ~ 700 DEG C.
The reason that in the ultimate principle that in steel of the present invention, each constituent content limits and manufacturing process, every technical parameter limits is as follows:
Because cementite is negative electrode relative to carbon steel (matrix is ferrite).Therefore, when carbon content increases, add negative electrode quantity and area, correspondingly its corrosion current adds, and thus causes its erosion resistance to reduce.As everyone knows, carbon is the most effective solution strengthening element, and therefore, along with the increase carbon steel of carbon content is hardening gradually, its cold working simultaneously (punching press, drawing) and welding property degenerate.Therefore amid all these factors, for ensureing the deep draw performance of electrolytic galvanized sheet, need carry out strict control to C content, carbon content is 0.002 ~ 0.004, is preferably 0.0025 ~ 0.0035%.
Silicon of the present invention is a kind of stronger solution strengthening element, adds the intensity that a certain amount of silicon can improve steel, but silicon content higher in base steel is to can pot galvanize have a negative impact.Along with the silicone content in base steel raises, then the SiO of the oxidized generation of silicon
2content increases thereupon, and this will have influence on the effect of follow-up pickling process, if when surface of steel plate after pickling still has remaining SiO
2, cause plating adhesion to degenerate.Therefore, for ensureing high anti-corrosion and the great surface quality of base material, carry out strict control to Si content, Si weight percentage controls 0.01 ~ 0.02, is preferably 0.012 ~ 0.02%.
Mn content 0.11 ~ 0.16% of the present invention.Mn energy reinforced ferrite, but also solid solution increases the intensity of electro-galvanizing base material.In addition, add manganese in steel and can prevent when hot-work because sulphur causes the embrittlement of steel, but along with the content of electrolytic galvanized sheet Mn higher, its processing characteristics will decline gradually.Therefore, Mn content is 0.11 ~ 0.16%, is preferably 0.12 ~ 0.14%.
P content≤0.012% of the present invention.In general, for requiring to have for good corrosion resistance and the good electro-galvanizing base material of pressworkability, the content of phosphorus is preferably low as far as possible, because phosphorus easily segregation occurs, and causes corrosion resisting property to reduce.Therefore, P content≤0.012%.
S content≤0.013% of the present invention.In general, in steel, S is detrimental impurity element, and the content of S is that less solidity to corrosion is better.Therefore, S content≤0.013%.
SolAl content of the present invention is 0.02 ~ 0.06%.The adding of Al in steel, can form dissolved aluminum (Als) and Soluble aluminium, and Als comprises solid solution aluminium and AlN, the AlN particle of disperse can stop growing up of austenite crystal, crystal grain thinning.Along with the increase of Als, the amount of inclusions of steel increases, and inclusion size also will become greatly, is deteriorated causing the coating adhesion of electrogalvanizing steel plate, corrosion resisting property and pressworkability.But generating AlN to ensure in steel that N and Al fully combines, and the surface quality of the complete deoxidation of molten steel and continuously cast bloom, Als should ensure >=0.02%.Therefore, solAl content is selected 0.02 ~ 0.06%, is preferably 0.04 ~ 0.05%.
N content≤0.005% of the present invention.N and C is the same, is also solid solution element.Along with the increase of N content in steel, its pressworkability will be caused to degenerate (as n, r value declines), simultaneously, solid solution N is the major cause causing precoated layer raw sheet finished product timeliness, particularly for the strain aging effect after smooth, the impact of nitrogen is especially large, therefore requires that N is as far as possible low.Concerning structure precoated steel plate, the N content in steel answers≤0.005%.
Ti content 0.05 ~ 0.09% of the present invention.Ti is typical microalloy element.The effect of Ti is crystal grain thinning, while raising hardness of steel, improves the toughness of steel.At high temperature, Ti and N or O generates TiN or Ti
2o
3micropartical, fining austenite grains as the forming core core of pro-eutectoid α-Fe.In addition, Ti and N or C combines and generates stable compound TiC or Ti (CN), and solute constituent element is withdrawn from sosoloid, restrained effectively the generation of " KESHI gas mass ", thus effectively prevents electrolytic galvanized sheet from adding the generation of wrinkle in man-hour.As time too much containing Ti amount, by forming large titanium nitride particle, cause steel to become fragile, thus electrolytic galvanized sheet pressworkability is degenerated, and increasing production cost; As very few containing Ti amount, it is difficult to be completely fixed C, N element in steel, does not have the effect preventing from processing wrinkle.In cold rolling ultra low-carbon steel, it is generally acknowledged that the add-on of Ti should be not less than 0.04%, amid all these factors, determine that in steel, Ti content is 0.05 ~ 0.09%, be preferably 0.06 ~ 0.07%.
Household electrical appliances deep-draw of the present invention resistance to fingerprint electricity zinc ga is 0.4 ~ 1.6mm, and be 810 ~ 840 DEG C through temperature, continuous annealing time 15 ~ 80s, metallographic structure is ferrite.Polishing unit elongation is 0.7 ~ 0.8%.Coating weight is 10 ~ 180g/m
2(two-sided), surface roughness value is 0.7 ~ 1.1 μm, PC value>=100/cm, yield strength R
p0.2be 120 ~ 180MPa; Tensile strength R
mbe 270 ~ 330MPa; Elongation after fracture A
80mmfor>=43%; r
90for>=2.0, Erichsen number>=9.5mm, the electrolytic galvanized sheet of resistance to fingerprint 96 hours salt-fog test white rust corrosion area≤3%, kinetic friction coefficient≤0.15.
The household electrical appliances deep-draw electrolytic galvanized sheet of resistance to fingerprint of the present invention has the following advantages:
(1) electrolytic galvanized sheet of the present invention adopts ultra low-carbon steel, add trace Ti alloy, can ensure that electrolytic galvanized sheet of the present invention has excellent deep drawability energy, punching place deflection can be made again to be no more than 1%, assemble the technical barrier of difficulty after solving current electrolytic galvanized sheet punching, meet the requirement that household appliances enterprise manufactures the various complicated deep-draw distortion such as laundry face shell, liquid crystal display television back and assembling.
(2) corrosion resisting property of the electrolytic galvanized sheet that the present invention relates to is excellent and have certain punching press oilness, adapts to various punching press, application and assembly technology.
Embodiment
Below in conjunction with specific embodiment the electrolytic galvanized sheet of resistance to fingerprint is rushed to ultra-deep of the present invention and manufacture method is described in further detail.
Embodiment 1
A kind of ultra-deep rushes the electrolytic galvanized sheet of resistance to fingerprint, and its chemical composition is by weight percentage: C:0.0040, Si:0.016, Mn:0.15, P:0.012, S:0.010, sol.Al:0.05, N:0.0023, Ti:0.070, and all the other are Fe and inevitable impurity.
Its manufacture method comprises the following steps: adopt molten iron-steelmaking → vacuum-treat → continuous casting → hot rolling → pickling → cold rolling → continuous annealing → polishing → straightening → electro-galvanizing → resistance to fingerprint, wherein, be rolled after smelting and pour into slab, hot rolling Heating temperature 1000 DEG C, finishing temperature is 800 DEG C, coiling temperature is 600 DEG C, the cold rolling of 5 passages is carried out after hot continuous rolling, it is 73% that cold rolling draft controls, continuous annealing temperature is 820 DEG C, continuous annealing time 80s, and polishing unit elongation is 0.7%, surface roughness value is 1.08 μm, and PC value is 100/cm.
Products obtained therefrom, electrolytic coating weight is 30g/m
2(two-sided), thickness of slab is 1.5mm, yield strength R
p0.2for 175MPa; Tensile strength R
mfor 316MPa; Elongation after fracture A
80mmbe 44%; r
90be 2.15, Erichsen number is 10mm, the electrolytic galvanized sheet of resistance to fingerprint 96 hours salt-fog test white rust corrosion areas 2.5%, kinetic friction coefficient 0.15.
Embodiment 2
A kind of ultra-deep rushes the electrolytic galvanized sheet of resistance to fingerprint, and its chemical composition is by weight percentage: C:0.0032, Si:0.015, Mn:0.13, P:0.010, S:0.011, sol.Al:0.06, N:0.0043, Ti:0.085, and all the other are Fe and inevitable impurity.
Its production method comprises the following steps: adopt molten iron-steelmaking → vacuum-treat → continuous casting → hot rolling → pickling → cold rolling → continuous annealing → polishing → straightening → electro-galvanizing → resistance to fingerprint, wherein, be rolled after smelting and pour into slab, hot rolling Heating temperature 1200 DEG C, finishing temperature is 1000 DEG C, coiling temperature is 700 DEG C, the cold rolling of 5 passages is carried out after hot continuous rolling, it is 83% that cold rolling draft controls, continuous annealing temperature is 840 DEG C, continuous annealing time 50s, and polishing unit elongation is 0.8%, surface roughness value is 1.0 μm, and PC value is 105/cm.
Products obtained therefrom, electrolytic coating weight is 40g/m
2(two-sided), thickness of slab is 1.0mm, yield strength R
p0.2for 165MPa; Tensile strength R
mfor 310MPa; Elongation after fracture A
80mmbe 45%; r
90be 2.25, Erichsen number is 11mm, the electrolytic galvanized sheet of resistance to fingerprint 96 hours salt-fog test white rust corrosion areas 1.5%, kinetic friction coefficient 0.12.
Embodiment 3
A kind of ultra-deep rushes the electrolytic galvanized sheet of resistance to fingerprint, and its chemical composition is by weight percentage: C:0.0036, Si:0.012, Mn:0.12, P:0.008, S:0.012, sol.Al:0.03, N:0.003, Ti:0.065, and all the other are Fe and inevitable impurity.
Its production method comprises the following steps: adopt molten iron-steelmaking → vacuum-treat → continuous casting → hot rolling → pickling → cold rolling → continuous annealing → polishing → straightening → electro-galvanizing → resistance to fingerprint, wherein, be rolled after smelting and pour into slab, hot rolling Heating temperature 1100 DEG C, finishing temperature is 900 DEG C, coiling temperature is 650 DEG C, the cold rolling of 5 passages is carried out after hot continuous rolling, it is 75% that cold rolling draft controls, continuous annealing temperature is 830 DEG C, continuous annealing time 60s, and polishing unit elongation is 0.8%, surface roughness value is 0.95 μm, and PC value is 103/cm.
The electrolytic coating weight of products obtained therefrom steel is 40g/m
2(two-sided), thickness of slab is 0.8mm, yield strength R
p0.2for 170MPa; Tensile strength R
mfor 312MPa; Elongation after fracture A
80mmbe 45%; r
90be 2.3, Erichsen number is 10.8mm, the electrolytic galvanized sheet of resistance to fingerprint 96 hours salt-fog test white rust corrosion areas 2.0%, kinetic friction coefficient 0.13.
Embodiment 4
A kind of ultra-deep rushes the electrolytic galvanized sheet of resistance to fingerprint, and its chemical composition is by weight percentage: C:0.0028, Si:0.018, Mn:0.11, P:0.006, S:0.012, solAl:0.04, N:0.004, Ti:0.055, and all the other are Fe and inevitable impurity.
Its production method comprises the following steps: adopt molten iron-steelmaking → vacuum-treat → continuous casting → hot rolling → pickling → cold rolling → continuous annealing → polishing → straightening → electro-galvanizing → resistance to fingerprint, wherein, be rolled after smelting and pour into slab, hot rolling Heating temperature 1200 DEG C, finishing temperature is 900 DEG C, coiling temperature is 700 DEG C, the cold rolling of 5 passages is carried out after hot continuous rolling, it is 78% that cold rolling draft controls, continuous annealing temperature is 810 DEG C, continuous annealing time 40s, and polishing unit elongation is 0.7%, surface roughness value is 0.8 μm, and PC value 112 is individual/cm.
The electrolytic coating weight of products obtained therefrom is 50g/m
2(two-sided), thickness of slab is 0.6mm, yield strength R
p0.2for 140MPa; Tensile strength R
mfor 290MPa; Elongation after fracture A
80mmbe 50%; r
90be 2.4, Erichsen number is 12mm, the electrolytic galvanized sheet of resistance to fingerprint 96 hours salt-fog test white rust corrosion areas 1.0%, kinetic friction coefficient 0.11.
Embodiment 5
A kind of ultra-deep rushes the electrolytic galvanized sheet of resistance to fingerprint, and its chemical composition is by weight percentage: C:0.002, Si:0.019, Mn:0.14, P:0.007, S:0.013, sol.Al:0.02, N:0.005, Ti:0.06, and all the other are Fe and inevitable impurity.
Its production method comprises the following steps: adopt molten iron-steelmaking → vacuum-treat → continuous casting → hot rolling → pickling → cold rolling → continuous annealing → polishing → straightening → electro-galvanizing → resistance to fingerprint, wherein, be rolled after smelting and pour into slab, hot rolling Heating temperature 1100 DEG C, finishing temperature is 860 DEG C, coiling temperature is 660 DEG C, the cold rolling of 5 passages is carried out after hot continuous rolling, it is 80% that cold rolling draft controls, continuous annealing temperature is 820 DEG C, continuous annealing time 20s, and polishing unit elongation is 0.7%, surface roughness value is 0.75 μm, and PC value is 109/cm.
Gained product made from steel electrolytic coating weight is 30g/m
2(two-sided), thickness of slab is 0.4mm, yield strength R
p0.2for 125MPa; Tensile strength R
mfor 285MPa; Elongation after fracture A
80mmbe 48%; r
90be 2.5, Erichsen number is 12.5mm, the electrolytic galvanized sheet of resistance to fingerprint 96 hours salt-fog test white rust corrosion areas 2.5%, kinetic friction coefficient 0.14.
Claims (4)
1. a ultra-deep rushes the electrolytic galvanized sheet of resistance to fingerprint, its chemical composition is by weight percentage: C:0.002 ~ 0.004, Si:0.01 ~ 0.02, Mn:0.11 ~ 0.16, P≤0.012, S≤0.013, Ti:0.05 ~ 0.09, solAl:0.02 ~ 0.06, N≤0.005, and all the other are Fe and inevitable impurity.
2. ultra-deep according to claim 1 rushes the electrolytic galvanized sheet of resistance to fingerprint, it is characterized in that: the chemical composition of this steel is by weight percentage: its chemical composition is by weight percentage: C:0.0025 ~ 0.0035, Si:0.012 ~ 0.02, Mn:0.12 ~ 0.14, P≤0.012, S≤0.013, Ti:0.06 ~ 0.07, solAl:0.04 ~ 0.05, N≤0.005, all the other are Fe and inevitable impurity.
3. described in a claim 1, ultra-deep rushes the manufacture method of the electrolytic galvanized sheet of resistance to fingerprint, comprise the following steps: desulfurizing iron, converter smelting, vacuum-treat, continuous casting, hot continuous rolling, cold rolling, continuous annealing, to batch, it is characterized in that: described hot continuous rolling Heating temperature is 1000 ~ 1200 DEG C, finishing temperature is 800 ~ 1000 DEG C, carry out the cold rolling of 5 passages after described hot continuous rolling, it is 73 ~ 83% that cold rolling draft controls; Continuous annealing temperature is 810 ~ 840 DEG C, continuous annealing time 15 ~ 80s, then carries out electro-galvanizing, resistance to finger prints processing after smooth, straightening.
4. ultra-deep rushes the manufacture method of the electrolytic galvanized sheet of resistance to fingerprint according to claim 3, it is characterized in that: described coiling temperature is 600 ~ 700 DEG C.
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Cited By (6)
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| CN105420607A (en) * | 2015-12-26 | 2016-03-23 | 首钢总公司 | Control method for increasing painting performance and surface quality of cold rolling automobile sheet |
| CN105483547A (en) * | 2015-12-03 | 2016-04-13 | 武汉钢铁(集团)公司 | Deep-drawing fingerprint-resistant electro-galvanized plate for household appliance, and preparation method thereof |
| CN109604336A (en) * | 2018-10-24 | 2019-04-12 | 首钢京唐钢铁联合有限责任公司 | A kind of preparation method and device of heat zinc coating plate |
| CN110218936A (en) * | 2019-06-03 | 2019-09-10 | 武汉钢铁有限公司 | A kind of boracic Ultra-low carbon tin plate and production method |
| CN113355710A (en) * | 2021-06-08 | 2021-09-07 | 武汉钢铁有限公司 | Hard-coating electro-galvanizing fingerprint-resistant coating plate for large-deformation stamping household appliance outer plate and manufacturing method thereof |
| CN114921724A (en) * | 2022-05-20 | 2022-08-19 | 武汉钢铁有限公司 | Steel plate for producing single-layer welded pipe for high-speed drawing and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105483547A (en) * | 2015-12-03 | 2016-04-13 | 武汉钢铁(集团)公司 | Deep-drawing fingerprint-resistant electro-galvanized plate for household appliance, and preparation method thereof |
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| CN110218936A (en) * | 2019-06-03 | 2019-09-10 | 武汉钢铁有限公司 | A kind of boracic Ultra-low carbon tin plate and production method |
| CN113355710A (en) * | 2021-06-08 | 2021-09-07 | 武汉钢铁有限公司 | Hard-coating electro-galvanizing fingerprint-resistant coating plate for large-deformation stamping household appliance outer plate and manufacturing method thereof |
| CN114921724A (en) * | 2022-05-20 | 2022-08-19 | 武汉钢铁有限公司 | Steel plate for producing single-layer welded pipe for high-speed drawing and manufacturing method thereof |
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