CN107267727A - The manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steels - Google Patents

The manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steels Download PDF

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Publication number
CN107267727A
CN107267727A CN201710419244.7A CN201710419244A CN107267727A CN 107267727 A CN107267727 A CN 107267727A CN 201710419244 A CN201710419244 A CN 201710419244A CN 107267727 A CN107267727 A CN 107267727A
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control
carried out
temperature
steel
manufacture method
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CN201710419244.7A
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Inventor
杜小峰
林承江
胡宽辉
苏衍战
陈园林
陈宇
孙方义
方芳
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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Priority to CN201710419244.7A priority Critical patent/CN107267727A/en
Publication of CN107267727A publication Critical patent/CN107267727A/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention discloses a kind of manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steel, it is characterised in that comprises the following steps：1) steel are heated after smelting, refining and be casting continuously to form base to strand；2) roughing is carried out；3) finish rolling is carried out；4) batched；5) pickling is carried out；6) carry out cold rolling；7) continuous annealing is carried out；8) galvanizing is carried out；9) alloying is carried out；10) finishing is carried out.The present invention has good mechanical performance, the beneficial effect that surface quality is good, anti-grinded hardness index is excellent.

Description

The manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steels
Technical field
The present invention relates to the manufacture method of cold-rolled biphase steel, specifically a kind of 500MPa grades of automobile exterior panel is plated with zinc-iron alloy The manufacture method of layer dual phase sheet steel.
Background technology
Currently, cold-rolled biphase steel and hot dip galvanized dual phase steel are used primarily on automobile structure and reinforcer, Surface Quality It is less demanding, therefore, more mechanical properties for simply paying close attention to product in composition design and technology controlling and process, and to its surface matter The attention rate of amount is inadequate.And the dual phase steel of zn-fe alloy coating has been used in the manufacture of Japanese car outer covering piece, therefore Ensure to propose requirements at the higher level to its surface quality in the case of mechanical property.
The content of the invention
The invention aims to solve the deficiency that above-mentioned background technology is present, propose a kind of excellent with mechanical property The manufacture for the 500MPa level automobile exterior panel zn-fe alloy coating dual phase sheet steels that good, surface quality is good, anti-grinded hardness index is excellent Method.
In order to realize the above object a kind of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase steels that the present invention is provided The manufacture method of steel plate, it is characterised in that comprise the following steps：
1) steel are heated after smelting, refining and be casting continuously to form base to strand, and heating and temperature control is 1250~1280 ℃；
2) roughing is carried out, control roughing temperature is at 1060~1110 DEG C；
3) finish rolling is carried out, it is 900~930 DEG C to control finish rolling finishing temperature；
4) batched, control coiling temperature is at 580~620 DEG C；
5) pickling is carried out, pickling temperature control is at 80~90 DEG C, and acid strength is more than 70g/l；
6) progress is cold rolling, controls cold rolling total reduction 58~72%；
7) continuous annealing is carried out：Control its soaking temperature at 770~800 DEG C, furnace annealing dew point of atmosphere is controlled at -40 DEG C Hereinafter, oxygen content≤3ppm；
8) galvanizing is carried out：Control steel plate enters zinc pot temperature for 460~480 DEG C；Al content exists in control zinc liquid composition 0.120~0.135wt%；
9) alloying is carried out：Its alloying temperature is controlled in 480~540 DEG C, 10~25s of soaking time, coating iron content Control is in 9~11wt%；
10) finishing is carried out：Finishing elongation control is 0.4~0.6%.Steel surface roughness exists after control alloying 0.5~1.2 μm, surface PC value controls are 100~150/cm.
As the preferred scheme of the present invention, the chemical composition of the steel is C：0.07~0.10%, Si：≤ 0.005%, Mn：0.70~1.00%, P≤0.005%, S≤0.003%, Als：0.010~0.050%, Cr：0.30~0.50%；Mo： 0.05~0.20%, remaining is Fe.
Beneficial effects of the present invention：Designed by low Si, and add appropriate Cr, Mo quenching degree element, pass through technique control System, product object performance reaches that yield strength is 300~340MPa, and tensile strength is 520~570MPa, elongation percentage A80For 29~ 33%, n value be 0.17~0.19, roughness be 0.5~1.2 μm, PC values be 100~150 (/cm), 1~2 grade of efflorescence rank, and Coating surface is fine and close, uniform color zero defect, and anti-grinded hardness index is excellent, can meet the manufacturing of vehicle exterior cladding element.
Embodiment
Embodiment：A kind of manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steel, including such as Lower step：
1) steel are heated after smelting, refining and be casting continuously to form base to strand, and heating and temperature control is 1250~1280 ℃；
2) roughing is carried out, control roughing temperature is at 1060~1110 DEG C；
3) finish rolling is carried out, it is 900~930 DEG C to control finish rolling finishing temperature；
4) batched, control coiling temperature is at 580~620 DEG C；
5) pickling is carried out, pickling temperature control is at 80~90 DEG C, and acid strength is more than 70g/l；
6) progress is cold rolling, controls cold rolling total reduction 58~72%；
7) continuous annealing is carried out：Control its soaking temperature at 770~800 DEG C, furnace annealing dew point of atmosphere is controlled at -40 DEG C Hereinafter, oxygen content≤3ppm；
8) galvanizing is carried out：Control steel plate enters zinc pot temperature for 460~480 DEG C；Al content exists in control zinc liquid composition 0.120~0.135wt%；
9) alloying is carried out：Its alloying temperature is controlled in 480~540 DEG C, 10~25s of soaking time, coating iron content Control is in 9~11wt%；
10) finishing is carried out：Finishing elongation control is 0.4~0.6%.Steel surface roughness exists after control alloying 0.5~1.2 μm, surface PC value controls are 100~150/cm.
The chemical composition of the steel is C：0.07~0.10%, Si：≤ 0.005%, Mn：0.70~1.00%, P≤ 0.005%, S≤0.003%, Als：0.010~0.050%, Cr：0.30~0.50%；Mo：0.05~0.20%, remaining is Fe。
Compared with prior art, the advantage of this technology is：
C：Maximally effective intensified element, is the formation element of martensite, the content of C element determine martensite pattern and The intensity of dual phase steel.Simultaneously as vehicle exterior cladding element, forming property, flange performance and welding performance to material will Ask higher, therefore it is required that relatively low carbon content.Meanwhile, in galvanizing, higher carbon content can also accelerate zinc-iron to react, zinc-iron Alloy-layer is thickening to deteriorate the anti-grinded hardness index of material.Therefore, consider, by C content control 0.07~0.10%.
Si：Ferritic intensified element, can improve the intensity of product.But Si can promote iron scale in the hot rolling Generation, deteriorate surface quality, and have influence on the effect of follow-up pickling process.Meanwhile, with the raising of Si contents, galvanizing Si enrichments are obvious in journey, and surface of steel plate easily produces plating leakage point defect, has a strong impact on plate surface quality.Therefore, to obtain height Surface quality, by Si contents control below 0.005%.
Mn：Among the austenite stabilizing elements, can postpone the formation of pearlite and bainite, promote the formation of martensite, improve steel Quenching degree.But Mn is also a kind of strong oxidizing property element, it can be enriched with and aoxidize in steel strip surface in annealing process, so as to lead Cause occur plating leakage defect when zinc-plated, wellability is deteriorated.Therefore, in the case of proof strength, by the control of Mn contents 0.70 ~1.00% relatively low scope.
P：P is the harmful element in steel, easily in cyrystal boundary segregation, increases steel plate fragility, causes the punching performance of steel plate to become Difference, deteriorated weldability.When simultaneously zinc-plated, P content is too high, and coating can be made to form substantial amounts of " phase, coating productive technique variation. Therefore, P content should be reduced as far as possible.But it is also a kind of effectively solution strengthening element in view of P, it is preferable that P≤0.005%.
S：S is the harmful element in steel, when S too high levels, easily forms MnS and is mingled with, damages steel plate plasticity, and cause The anisotropy of performance.And with the raising of S contents, the corrosion resisting property of steel plate will also be deteriorated.Accordingly, it would be desirable to rationally control S Content, S contents are less than 0.003%.
Al：Maximally effective deoxidant element.But, with the increase of Als contents, the field trash in steel can also increase, and be mingled with Thing size will become big.Therefore, it should rationally control Als contents, it is preferable that Als：0.010~0.050%.
Cr、Mo：Addition Cr, Mo element can be such that CCT curve substantially moves to right, and strong inhibition pearlite and bainite transformation have Martensitic structure is obtained beneficial in alloyed zinc hot dip galvanized production line.Simultaneously as the generation gibbs of Cr, Mo oxide is certainly By can be higher than oxides such as Mn, Si, P, so being not susceptible to surface oxidation when galvanizing is annealed, also show without surface segregation As, therefore do not interfere with the wellability of zinc liquid.In cold-reduced sheet and pure zine plate, although Mo quenching degree effect is more preferably, due to Mo alloys are expensive, generally use Cr element substitution Mo elements.But in zn-fe alloy coating plate, due to reheat after zinc-plated Zinc-iron alloy reaction is carried out to 480-540 DEG C of insulation, bainite reaction zone is exactly in, horse can not effectively be obtained by only adding Cr Family name's body tissue, it is therefore necessary to add the formation that appropriate Mo suppresses bainite.Therefore, considering, Cr contents elect 0.30 as~ 0.50%, Mo content elect 0.05~0.20% as.
In the technique of the present invention：
It is 900~930 DEG C why to select finishing temperature, is the hot-rolled temperature somewhat ripple because when finishing temperature is too low It is dynamic to be possible to enter two-phase section rolling, mixed grain structure is easily produced, the inhomogeneities of tissue is except meeting is to the equal of mechanical property Even property is produced outside influence, also can produce influence to the uniformity of galvanizing surface.
It is 580~620 DEG C why to select coiling temperature, is that, because coiling temperature is too high, can cause coarse grains, so that Influence structural homogenity.Meanwhile, hot-rolled substrate uniform small grains can also make recrystal grain fine uniform, so as to improve material Processing hardening value.
Why pickling temperature requires control at 80~90 DEG C, and acid strength is greater than 70g/l.It is because pickling can be with Effectively remove iron scale.Pickling effect is bad, iron scale can be caused to remain, and then is pressed into matrix during acid rolls, from And cause plating leakage surface defect.
Why cold rolling reduction ratio is set as 58~72%, is because being so conducive to deformation energy in increase steel, reduction Recrystallization temperature, improves steel formability performance.And cold rolling reduction ratio crosses conference and causes mill load to increase, equipment loss can add Greatly.
Why continuous annealing soaking temperature is 770~800 DEG C, is the product energy of the present invention because under this annealing temperature Obtain optimal Performance Match.Meanwhile, compared with low temperature thermal oxidation, it may also reduce Mn elements surface of steel plate enrichment so that Reduce the formation of Reoxides.Meanwhile, strict control annealing furnace atmosphere, dew point is controlled below -40 DEG C, and oxygen content≤ 3ppm, it is ensured that surface of steel plate fully reduces and improves the wellability of steel plate.
Why strip enters zinc pot temperature for 460~480 DEG C, be in order to prevent temperature is too high from causing zinc liquid temperature to raise, Bottom ash, which increases, causes surface of steel plate cadmia and sinking roll marks defect.Meanwhile, zinc liquid composition Al content control range be 0.120~ 0.135%, Fe content≤0.015%.Because, when zinc pot aluminium content is less than 0.120%, substrate is directly formed with coating Fe2Al5Inhibition layer is not uniform enough, and alloying easily occurred in coating；When zinc pot aluminium content is higher than 0.135%, Fe2Al5Suppression Preparative layer is blocked up, and alloying process is more difficult, now needs to improve alloying temperature or reduces strip speed, is so easily caused conjunction Aurification plate efflorescence is serious.
Why alloying temperature is 480~540 DEG C, and 10~25s of soaking time, coating iron content requires control 10% Left and right.It is because when alloying temperature is less than 480 DEG C, the more difficult alloying of coating, coating iron-holder is low, easy in coating surface Substantial amounts of ζ phases are remained, product corrosion resistance, weldability, coating performance are deteriorated；When alloying temperature is higher than 540 DEG C, easy shape Into substantial amounts of brittlement phase ", product anti-grinded hardness index be deteriorated.Research shows simultaneously, when coating Fe contents are in 9~11%, its coating Anti-grinded hardness index is optimal.
Why select 0.4~0.6% finishing elongation percentage, be because can improve plate shape and control belt steel surface it is coarse Degree, so that the control of coating surface roughness is 0.5~1.2 (μm), PC values control in surface is 100~150 (individual/cm), with profit In the application of automobile exterior panel.
By product object performance produced by the invention reach yield strength be 300~340MPa, tensile strength be 520~ 570MPa, elongation percentage is that 29~33%, n values are 0.17~0.19, and roughness is 0.5~1.2 μm, PC values for 100~150 (/ Cm), 1~2 grade of efflorescence rank, and coating surface is fine and close, uniform color zero defect, anti-grinded hardness index is excellent, can meet outside automobile The manufacturing of covering.With the development of automobile high strengthening, automobile exterior panel zn-fe alloy coating dual phase steel has good Market prospects.
The above described is only a preferred embodiment of the present invention, not doing any formal to the structure of the present invention Limitation.Any simple modification, equivalent variations and modification that every technical spirit according to the present invention is made to above example, In the range of still falling within technical scheme.
Table 1 to invent each embodiment and comparative example chemical composition comparative example (wt%), table 2 be various embodiments of the present invention and Comparative example technological parameter list, table 3 is the performance detection list of various embodiments of the present invention and comparative example.
Table 1
Table 2
Table 3

Claims (2)

1. a kind of manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steel, it is characterised in that including Following steps：
1) steel are heated after smelting, refining and be casting continuously to form base to strand, and heating and temperature control is at 1250~1280 DEG C；
2) roughing is carried out, control roughing temperature is at 1060~1110 DEG C；
3) finish rolling is carried out, it is 900~930 DEG C to control finish rolling finishing temperature；
4) batched, control coiling temperature is at 580~620 DEG C；
5) pickling is carried out, pickling temperature control is at 80~90 DEG C, and acid strength is more than 70g/l；
6) progress is cold rolling, controls cold rolling total reduction 58~72%；
7) continuous annealing is carried out：Its soaking temperature is controlled at 770~800 DEG C, the control of furnace annealing dew point of atmosphere -40 DEG C with Under, oxygen content≤3ppm；
8) galvanizing is carried out：Control steel plate enters zinc pot temperature for 460~480 DEG C；Al content is 0.120 in control zinc liquid composition ~0.135wt%；
9) alloying is carried out：Its alloying temperature is controlled in 480~540 DEG C, 10~25s of soaking time, the control of coating iron content In 9~11wt%；
10) finishing is carried out：Finishing elongation control is 0.4~0.6%.Control after alloying steel surface roughness 0.5~ 1.2 μm, surface PC value controls are 100~150/cm.
2. the manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steel according to claim 1, It is characterized in that：The chemical composition of the steel is C：0.07~0.10%, Si：≤ 0.005%, Mn：0.70~1.00%, P ≤ 0.005%, S≤0.003%, Als：0.010~0.050%, Cr：0.30~0.50%；Mo：0.05~0.20%, remaining For Fe.
CN201710419244.7A 2017-06-06 2017-06-06 The manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steels Pending CN107267727A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108754343A (en) * 2018-06-26 2018-11-06 武汉钢铁有限公司 450MPa grades of automobile exterior panels zn-fe alloy coating dual phase sheet steel and its manufacturing methods
CN110172640A (en) * 2019-05-30 2019-08-27 安徽工业大学 500MPa grades high work hardening rate hot dip galvanized dual phase steel plate and preparation method thereof
CN110527923A (en) * 2019-06-03 2019-12-03 武汉钢铁有限公司 A kind of 600MPa grades of body of a motor car high-yield-ratio structural steel and production method
CN111041341A (en) * 2018-10-11 2020-04-21 鞍钢广州汽车钢有限公司 High-strength dual-phase steel formula and zinc plating production process thereof
CN111041342A (en) * 2018-10-12 2020-04-21 鞍钢广州汽车钢有限公司 Lightweight high-strength dual-phase steel formula and zinc plating production process thereof
CN115216607A (en) * 2022-06-30 2022-10-21 武汉钢铁有限公司 Control method for alloying spot defect of hot-dip galvanized iron alloy outer plate

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CN101781739A (en) * 2010-03-18 2010-07-21 武汉钢铁(集团)公司 Automobile cold-rolled dual-phase steel with tensile strength of 500 MPa
CN104109814A (en) * 2014-08-08 2014-10-22 鞍钢蒂森克虏伯汽车钢有限公司 Cold-rolled hot-galvanized dual-phase steel plate with flanging property and manufacturing method thereof
CN104975226A (en) * 2015-07-30 2015-10-14 武汉钢铁(集团)公司 Automotive alloying hot-dip galvanized steel with tensile strength of 440 MPa and production method
CN105369135A (en) * 2015-12-22 2016-03-02 武汉钢铁(集团)公司 450 MPa-level zinc-plated dual-phase steel for sedan and production method thereof
CN105401071A (en) * 2015-12-22 2016-03-16 武汉钢铁(集团)公司 Galvanized dual-phase steel for 500 MPa class car and production method

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Publication number Priority date Publication date Assignee Title
CN101781739A (en) * 2010-03-18 2010-07-21 武汉钢铁(集团)公司 Automobile cold-rolled dual-phase steel with tensile strength of 500 MPa
CN104109814A (en) * 2014-08-08 2014-10-22 鞍钢蒂森克虏伯汽车钢有限公司 Cold-rolled hot-galvanized dual-phase steel plate with flanging property and manufacturing method thereof
CN104975226A (en) * 2015-07-30 2015-10-14 武汉钢铁(集团)公司 Automotive alloying hot-dip galvanized steel with tensile strength of 440 MPa and production method
CN105369135A (en) * 2015-12-22 2016-03-02 武汉钢铁(集团)公司 450 MPa-level zinc-plated dual-phase steel for sedan and production method thereof
CN105401071A (en) * 2015-12-22 2016-03-16 武汉钢铁(集团)公司 Galvanized dual-phase steel for 500 MPa class car and production method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108754343A (en) * 2018-06-26 2018-11-06 武汉钢铁有限公司 450MPa grades of automobile exterior panels zn-fe alloy coating dual phase sheet steel and its manufacturing methods
CN111041341A (en) * 2018-10-11 2020-04-21 鞍钢广州汽车钢有限公司 High-strength dual-phase steel formula and zinc plating production process thereof
CN111041342A (en) * 2018-10-12 2020-04-21 鞍钢广州汽车钢有限公司 Lightweight high-strength dual-phase steel formula and zinc plating production process thereof
CN110172640A (en) * 2019-05-30 2019-08-27 安徽工业大学 500MPa grades high work hardening rate hot dip galvanized dual phase steel plate and preparation method thereof
CN110527923A (en) * 2019-06-03 2019-12-03 武汉钢铁有限公司 A kind of 600MPa grades of body of a motor car high-yield-ratio structural steel and production method
CN110527923B (en) * 2019-06-03 2021-10-26 武汉钢铁有限公司 High-yield-ratio structural steel for 600 MPa-grade automobile body and production method thereof
CN115216607A (en) * 2022-06-30 2022-10-21 武汉钢铁有限公司 Control method for alloying spot defect of hot-dip galvanized iron alloy outer plate
CN115216607B (en) * 2022-06-30 2023-11-10 武汉钢铁有限公司 Control method for alloying speck defect of hot dip galvanized iron alloy outer plate

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Application publication date: 20171020