CN110273108A - A kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate and its production method - Google Patents

A kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate and its production method Download PDF

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Publication number
CN110273108A
CN110273108A CN201910695986.1A CN201910695986A CN110273108A CN 110273108 A CN110273108 A CN 110273108A CN 201910695986 A CN201910695986 A CN 201910695986A CN 110273108 A CN110273108 A CN 110273108A
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acid
hot rolling
electrogalvanizing
production
steel plate
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CN201910695986.1A
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Inventor
王占业
赵云龙
汪建威
汤亨强
李进
贾幼庆
吴浩
俞波
张金红
杨德伦
何峰
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Maanshan Iron and Steel Co Ltd
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Maanshan Iron and Steel Co Ltd
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Priority to CN201910695986.1A priority Critical patent/CN110273108A/en
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/004Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23GCLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08Iron or steel
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite

Abstract

The invention discloses a kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate and its production method, the chemical component including following weight percent: C≤0.008%, Si≤0.030%, Mn:0.10%~0.40%, P≤0.015%, S≤0.010%, Al:0.020%~0.060%, Ti≤0.080%, N≤0.0050%.Through molten iron pretreatment, converter smelting, alloy fine tuning, the refining of RH furnace, continuous casting, slab heating, hot rolling, section cooling, batch, pickling, flattening process are prepared, its thickness range can be controlled in 1.5~6.0mm, it can be used for producing think gauge plated steel sheet, surface quality is in FB or more, surface color is uniform, can satisfy the requirement of electrogalvanizing.

Description

A kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate and its production method
Technical field
The invention belongs to electrogalvanizing hot rolling acid-cleaning steel plate technical fields, and in particular to a kind of deep-draw grade electrogalvanizing hot rolling Pickled plate and its production method.
Background technique
Plated steel sheet have good corrosion resistance, processability, solderability and paintability, be mainly used for automobile, household electrical appliances, The industries such as electronics, light industry.With the rapid development of China's automobile, household electrical appliances, electronics industry, China plated steel sheet market is presented The case where supply falls short of demand.Due to the restriction of qualitative factor and manufacturing technology level, there is still a need for a large amount of for China's electrolytic zinc-coated steel sheet panel products Import.Due to the particularity of galvanizing technique, it is desirable that substrate has good template and surface quality.Because cold-rolled steel sheet is than hot rolling acid Wash that plate surface quality is more excellent, the substrate of plated steel sheet is mainly cold-rolled steel sheet at present.
The thickness of electrogalvanizing cold-rolled steel sheet generally in 3.0mm hereinafter, be not able to satisfy the demand of think gauge plated steel sheet, And its production procedure is complex, production cost is higher.And the hot rolling acid-cleaning steel plate surface evenness of general applications is poor, electrogalvanizing Rear surface color difference is obvious, is not able to satisfy the requirement of electrogalvanizing.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate and its productions Method, thickness range can be controlled in 1.5~6.0mm, can be used for producing think gauge plated steel sheet, surface quality FB with On, surface color is uniform, can satisfy the requirement of electrogalvanizing.
The technical scheme adopted by the invention is as follows:
A kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate, the chemical component including following weight percent: C≤ 0.008%, Si≤0.030%, Mn:0.10%~0.40%, P≤0.015%, S≤0.010%, Al:0.020%~ 0.060%, Ti≤0.080%, N≤0.0050%.
Further, it is preferable to be the chemical component for including following weight percent: C:0.003~0.008%, Si:0.009 ~0.026%, Mn:0.11%~0.37%, P≤0.014%, S≤0.010%, Al:0.024%~0.056%, Ti:0010 ~0.079%, N≤0.0046%.
The effect and control of above-mentioned each chemical component are as follows:
Carbon (C): C is to improve that intensity is most economical and most effective solution strengthening element, C content increase, and intensity increases, but steel Plasticity and formability reduce.Therefore consider from economy and comprehensive performance, the control of C percentage composition is 0.008% in the present invention Hereinafter, preferably 0.003~0.008%.
Silicon (Si): Si too high levels, steel surface iron oxide scale are not easy to remove, and surface is easy to form since oxide is pressed into And the micro-crack generated, while the oxide of silicon hinders the generation of electrogalvanizing reaction, influences plated steel sheet surface quality, therefore Si percentage composition control range is≤0.030%, preferably 0.009~0.026% in the present invention.
Manganese (Mn): Mn can reduce austenite and be transformed into ferritic phase transition temperature, be conducive to fining ferrite grains;But Mn Too high levels, slab Mn degree of segregation in continuous casting process increase, and steel plate thickness centre easily forms pearlite or bainite Banded structure, banded structure this for high strength steel easily lead to lamination defect;It is simultaneously also the crackle originating point of fatigue rupture, It is all unfavorable to plasticity, welding performance, fatigue behaviour and electrogalvanizing surface quality, comprehensively consider, Mn percentage composition control in the present invention Range processed is 0.10%~0.40%, preferably 0.11%~0.37%.
Phosphorus (P): diffusion velocity of the P in γ-Fe and α-Fe is small, segregation is easily formed, to steel formability performance, low-temperature impact Toughness, welding performance are unfavorable, therefore as far as possible by P percentage composition control in steel below 0.015%.
Sulphur (S): S is also harmful element in general, so that steel is generated red brittleness, reduces the ductility and toughness of steel, Crackle is caused in forging and rolling, influences plated steel sheet surface quality, it is desirable that S content is as low as possible, therefore the present invention is most Amount controls the S percentage composition of steel grade below 0.010%.
Aluminium (Al): Al is as main deoxidier, while aluminium also has certain effect to refinement crystal grain.The shortcomings that aluminium is to influence steel Hot-working character, welding performance and cutting performance.The present invention control Al percentage composition control range be 0.020%~ 0.060%, preferably 0.024%~0.056%.
Titanium (Ti): Ti is strong deoxidier in steel.It can make the dense internal organization of steel, refine crystal grain power, improve the strong of steel Degree, improving welding property.The present invention controls the control of Ti percentage composition 0.080% hereinafter, preferably 0010~0.079%.
Nitrogen (N): N can improve the intensity of steel, low-temperature flexibility and weldability, increase aging sensitivity.The present invention is by the N of steel grade Percentage composition controls below 0.0050%
The metallographic structure of the deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate is ferrite, and grain size is 8.5~9.5 grades; Its surface quality is in FB or more;180~250MPa of its yield strength, 300~360MPa of tensile strength, A50Elongation percentage >=42%, 0.6~1.5 μm of surface roughness Ra value.
The present invention also provides the production method of the deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate, the production methods The following steps are included: molten iron pretreatment, converter smelting, alloy fine tuning, RH refining, continuous casting, slab heating, hot rolling, section cooling, It batches, is pickling, smooth.
Further, in molten iron pre-treatment step, it is desirable that preceding skim is skimmed with after, reduces sulfur content, and it is pure to improve molten steel Degree.
In converter smelting step, the pig iron, slag steel is not added;It is tapped using self-loopa steel scrap, strengthens converter dephosphorization, reinforce pushing off the slag Operation;Tapping process adds lime, without deoxidation, further increases Cleanliness of Molten Steel.
In alloy trim step, ladle top slag modification is carried out, reduces Al in steel2O3It is mingled with.
In RH refinement step, RH is then blown into oxygen in the prometaphase according to temperature and oxygen position if you need to oxygen blast using light treatment process Gas;The broken unprecedented guarantee net circulation time is not less than 6min, reduces field trash and generates.
In continuous casting step, 20~40 DEG C more than liquidus temperature, liquid steel temperature is excessively high, 1. ties for middle packet target temperature control Brilliant device green shell is thin, is easy bleed-out;Accelerate 2. refractory material corrodes, easily lead to casting and be lost control, reduces casting safety;3. increasing non- Metal inclusion influences slab inherent quality;4. center segregation aggravates, it is also easy to produce central crack.Liquid steel temperature is too low, is 1. easy Nozzle blocking occurs, casting is interrupted;2. continuous casting surfaces are easy to produce the defects of knot blister, slag inclusion, crackle;3. nonmetal inclusion is not easy It floats, influences slab quality.
In slab heating stepses, the control of slab tapping temperature at 1180 DEG C~1200 DEG C, time inside furnace 180min~ 240min;Tapping temperature is too low, it cannot be guaranteed that finishing temperature, tapping temperature is excessively high, and iron scale indentation is serious when rolling, in furnace Time is too short, and crystal grain is uneven, and time inside furnace is too long, and scale on surface is more.
In hot-rolled step, hot rolling roughing entrance high pressure descaling, hot fine rolling entrance puts into strip edge heater, and finish rolling enters and leaves Mouth high pressure descaling water standard-sized sheet reduces hot rolled steel plate surface oxidation iron sheet indentation, improves surface quality;Finishing temperature control is 870 DEG C~900 DEG C, to avoid two-phase section from rolling, finishing temperature cannot be too low.
In section cooling step, using back segment section cooling, oiler temperature control is at 600 DEG C~640 DEG C, coiling temperature mistake High or too low, the mechanical property or surface quality that will lead to finished product are difficult to ensure.
Hot rolled coil convexity C40 is controlled in 0~0.050mm, preferably 0.040~0.023mm;Wedge shape control 0~ 0.030mm, preferably 0.010~0.021mm, the same plate for reducing finished product are poor.
In acid pickling step, at 65~75 DEG C, 1# acid tank free acid concentration is controlled 50 for acid liquor temperature control in acid cleaning process The control of~80g/L, 2# acid tank free acid concentration is in 80~120g/L, and the control of 3# acid tank free acid concentration is in 120~160g/L, acid 80~120mpm of speed is washed, the control of free acid concentration and pickling speed can prevent surface of steel plate overpickling or deficient pickling.
In planarization step, smooth elongation percentage is 0.6%~1.5%, and the control of planisher work roll surface roughness Ra value is 0.7~1.0 μm, surface of steel plate uniformity can be improved in the control of flattening process.
The present invention produces electrogalvanizing hot rolling by accurately controlling the ingredient in steel, and by hot rolling, pickling, smooth process Pickled plate.Hot fine rolling entrance puts into strip edge heater, and strip width is organized more evenly on direction, to make plate property more Stablize.Steel-making control field trash, furnace temp and heating time cooperate, and hot rolling mill entrance high pressure water dephosphorization reduces hot rolling The indentation of surface oxidation iron, reasonable pickling and flattening process, make the surface quality of finished product in FB or more, surface color is uniform.It presses The hot rolling acid-cleaning steel plate of the method production, 180~250MPa of yield strength, the 300~360MPa of tensile strength, A of mechanical property50 Elongation percentage >=42%, there is good template and surface quality (FB or more), surface color by 0.6~1.5 μm of surface roughness Ra value Uniformly, it can satisfy electrogalvanizing requirement.
Detailed description of the invention
Fig. 1 is the surface quality figure before the deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate electrogalvanizing in embodiment 1;
Fig. 2 is the surface quality figure after the deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate electrogalvanizing in embodiment 1;
Fig. 3 is the metallographic structure figure of the deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate in embodiment 1.
Specific embodiment
The following describes the present invention in detail with reference to examples.
The chemical analysis and weight percent of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate in each embodiment and comparative example As shown in table 1.The production method of the deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate is the following steps are included: molten iron pre-processes, turns Furnace smelts, alloy fine tuning, the refining of RH furnace, continuous casting, slab heating, hot rolling, section cooling, batches, pickling, smooth;Wherein:
In molten iron pre-treatment step, it is desirable that preceding skim is skimmed with after, reduces sulfur content, improves Molten Steel Cleanliness.
In converter smelting step, the pig iron, slag steel is not added;It is tapped using self-loopa steel scrap, strengthens converter dephosphorization, reinforce pushing off the slag Operation;Tapping process adds lime, without deoxidation, further increases Cleanliness of Molten Steel.
In alloy trim step, ladle top slag modification is carried out, reduces Al in steel2O3It is mingled with.
In RH refinement step, RH is then blown into oxygen in the prometaphase according to temperature and oxygen position if you need to oxygen blast using light treatment process Gas;The broken unprecedented guarantee net circulation time is not less than 6min, reduces field trash and generates.
In continuous casting step, middle packet target temperature control is 20~40 DEG C more than liquidus temperature.
In acid pickling step, at 65~75 DEG C, 1# acid tank free acid concentration is controlled 50 for acid liquor temperature control in acid cleaning process The control of~80g/L, 2# acid tank free acid concentration is in 80~120g/L, and the control of 3# acid tank free acid concentration is in 120~160g/L, acid Wash 80~120mpm of speed.
Slab heating, hot rolling, batch, the process parameter control of flattening process it is as shown in table 2.
1 embodiment chemical component of table, wt%
C Si Mn P S Als Ti N
Embodiment 1 0.008 0.025 0.37 0.006 0.010 0.055 0.079 0.0037
Embodiment 2 0.004 0.011 0.22 0.009 0.008 0.036 0.010 0.0022
Embodiment 3 0.003 0.009 0.11 0.014 0.005 0.024 0.042 0.0046
Comparative example 1 0.010 0.030 0.45 0.015 0.012 0.018 0.087 0.006
Comparative example 2 0.006 0.032 0.008 0.012 0.008 0.045 0.082 0.006
After molten steel continuous casting, by hot rolling, pickling, smooth, electrogalvanizing hot rolling acid-cleaning steel plate, main technique ginseng are produced Several, final mechanical property and surface quality measurement are shown in Table 2, table 3.FIG. 1 to FIG. 2 can be seen that plate face homogeneous amount before and after electrogalvanizing Well.
2 production technology of table
3 product mechanical property of table
From examples detailed above as can be seen that present invention electrogalvanizing hot rolling acid-cleaning steel plate produced, thickness specification 1.5- 6.0mm, 180~250MPa of yield strength, 300~360MPa of tensile strength, A50Elongation percentage >=42%, surface roughness Ra value 0.6~1.5 μm, there are good template and surface quality (FB or more), electrogalvanizing requirement can be met.
As shown in figure 3, the electrogalvanizing obtained through process above step is mainly ferrite with hot rolling acid-cleaning steel plate tissue, it is brilliant Granularity is 8.5~9.5 grades.
Above-mentioned reference embodiment carries out a kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate and its production method detailed Description, is illustrative without being restrictive, several embodiments can be enumerated according to limited range, therefore do not departing from Change and modification under present general inventive concept should belong within protection scope of the present invention.

Claims (10)

1. a kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate, which is characterized in that the chemical component including following weight percent: C≤0.008%, Si≤0.030%, Mn:0.10%~0.40%, P≤0.015%, S≤0.010%, Al:0.020%~ 0.060%, Ti≤0.080%, N≤0.0050%.
2. deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate according to claim 1, which is characterized in that including following weight hundred The chemical component of point ratio: C:0.003~0.008%, Si:0.009~0.026%, Mn:0.11%~0.37%, P≤ 0.014%, S≤0.010%, Al:0.024%~0.056%, Ti:0010~0.079%, N≤0.0046%.
3. deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate according to claim 1 or 2, which is characterized in that the deep-draw grade The metallographic structure of electrogalvanizing hot rolling acid-cleaning steel plate is ferrite, and grain size is 8.5~9.5 grades;Its surface quality is in FB or more; 180~250MPa of its yield strength, 300~360MPa of tensile strength, A50Elongation percentage >=42%, surface roughness Ra value 0.6~ 1.5μm。
4. the production method of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate according to claim 1 to 3, special Sign is that the production method is the following steps are included: molten iron pretreatment, converter smelting, alloy fine tuning, the refining of RH furnace, continuous casting, casting Base heating hot rolling, section cooling, batches, is pickling, smooth.
5. production method according to claim 4, which is characterized in that RH uses light treatment process, and broken unprecedented guarantee follows only The ring time is not less than 6min;In continuous casting step, middle packet target temperature control is 20~40 DEG C more than liquidus temperature.
6. production method according to claim 4, which is characterized in that in slab heating stepses, the control of slab tapping temperature At 1180 DEG C~1200 DEG C, time inside furnace 180min~240min.
7. production method according to claim 4, which is characterized in that in hot-rolled step, hot rolling roughing entrance high pressure is removed Squama, hot fine rolling entrance put into strip edge heater, finish rolling entrance high pressure descaling water standard-sized sheet;Finishing temperature control 870 DEG C~ 900℃。
8. production method according to claim 4, which is characterized in that use back segment section cooling, oiler temperature control exists 600 DEG C~640 DEG C;Hot rolled coil convexity C40 control is in 0~0.050mm, and wedge shape control is in 0~0.030mm.
9. production method according to claim 4, which is characterized in that acid liquor temperature control is 65~75 in acid cleaning process DEG C, the control of 1# acid tank free acid concentration is in 50~80g/L, and the control of 2# acid tank free acid concentration is in 80~120g/L, the trip of 3# acid tank It controls from acid concentration in 120~160g/L, 80~120mpm of pickling speed.
10. production method according to claim 4, which is characterized in that smooth elongation percentage is 0.6%~1.5%, planisher The control of work roll surface roughness Ra value is 0.7~1.0 μm.
CN201910695986.1A 2019-07-30 2019-07-30 A kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate and its production method Pending CN110273108A (en)

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Publication number Priority date Publication date Assignee Title
CN111069306A (en) * 2019-11-26 2020-04-28 本钢板材股份有限公司 Production method for controlling spot defects on surface of electrogalvanized IF steel product
CN111455259A (en) * 2020-04-22 2020-07-28 马鞍山钢铁股份有限公司 Hot-rolled pickled steel plate for electrogalvanizing and production method thereof

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CN107475625A (en) * 2017-08-16 2017-12-15 马鞍山钢铁股份有限公司 A kind of yield strength >=350MPa electrogalvanizing cold-rolled steel sheet and production method

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CN103643119A (en) * 2013-12-26 2014-03-19 马钢(集团)控股有限公司 Hot-rolled and pickled steel plate for 210MPa-grade single-sided enamel and production method thereof
CN104805352A (en) * 2015-05-07 2015-07-29 马钢(集团)控股有限公司 Production method of cold-rolled steel plate for electro-galvanization
CN106282790A (en) * 2016-08-17 2017-01-04 马钢(集团)控股有限公司 A kind of electrogalvanizing ultra-deep punching cold-rolling steel sheet and production method thereof
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111069306A (en) * 2019-11-26 2020-04-28 本钢板材股份有限公司 Production method for controlling spot defects on surface of electrogalvanized IF steel product
CN111455259A (en) * 2020-04-22 2020-07-28 马鞍山钢铁股份有限公司 Hot-rolled pickled steel plate for electrogalvanizing and production method thereof

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