CN104419878B - Ultrahigh-strength cold-rolled dual-phase steel with weather resistance and manufacturing method thereof - Google Patents
Ultrahigh-strength cold-rolled dual-phase steel with weather resistance and manufacturing method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229910000885 Dual-phase steel Inorganic materials 0.000 title abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005097 cold rolling Methods 0.000 claims abstract description 17
- 238000000137 annealing Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 238000003303 reheating Methods 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 3
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 3
- 230000009467 reduction Effects 0.000 claims abstract description 3
- 229910000734 martensite Inorganic materials 0.000 claims description 15
- 229910000859 α-Fe Inorganic materials 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 229910001563 bainite Inorganic materials 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000005496 tempering Methods 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 3
- 238000005266 casting Methods 0.000 abstract description 2
- 238000010583 slow cooling Methods 0.000 abstract 1
- 229910001566 austenite Inorganic materials 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 238000010791 quenching Methods 0.000 description 8
- 230000000171 quenching effect Effects 0.000 description 8
- 239000010949 copper Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
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- 239000010970 precious metal Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
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- 238000003908 quality control method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 239000011780 sodium chloride Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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Abstract
The invention provides ultrahigh-strength cold-rolled dual-phase steel with weather resistance and a manufacturing method thereof, wherein the steel plate comprises the following components in percentage by weight (wt.%): c: 0.10% -0.16%, Si: 0.10-0.50%, Mn: 1.4% -2.2%, Cr: 0.30% -0.79%, Ni: 0.08-0.20%, Cu: 0.20-0.50%, Nb: 0.01 to 0.05 percent of Ti: 0.02% -0.05%, Al: 0.015-0.045%, P is less than or equal to 0.020%, S is less than or equal to 0.007%, N is less than or equal to 0.008%, and the balance is Fe and inevitable impurities. The method comprises the following steps: smelting and continuously casting the chemical components to obtain a cast slab; the reheating temperature of the plate blank is more than 1250 ℃, the start rolling temperature of finish rolling is 1040-1100 ℃, the finish rolling temperature is 880-930 ℃, and the coiling temperature is 580-660 ℃; the cold rolling reduction rate is 60-70%; slow cooling is matched with rapid cooling for continuous annealing in two stages. The super-strength cold-rolled dual-phase steel with the yield strength of more than 700MPa, the tensile strength of more than 800MPa and the elongation of more than 5 percent and the weather resistance can be obtained by adopting the method.
Description
Technical field
The invention belongs to high strength cold-rolled dual phase steel production technical field, more particularly to it is a kind of for container, automobile etc.
The superhigh intensity cold rolling dual phase steel with weatherability and its manufacture method.
Background technology
For Container Transport, in the urgent need to the container of lightweight is to increase the transportable goods weight of single, send out
Exhibition trend is then to be increasingly using long 45 to 53 feet container.Therefore, manufacture lightweight container consider first one
Point is exactly by manufacturing high strength steel to reduce steel plate thickness.Due to by being limited in terms of Hot Rolling Mill thickness, using hot rolling
The thickness of the weather-resistant steel plate of production is general thicker.The demand thinning in order to adapt to steel plate, exploitation yield strength 700MPa and its with
On superhigh intensity cold rolling weather resisting steel plate increasingly favored by container user, the steel plate of this rank effectively can be reduced
Steel consumption is reducing manufacturing cost.Ultrahigh-strength steel plates produce bigger than the steel difficulty of common intensity rank in steel mill, to setting
It is standby to have high demands, and quality control is more difficult.
More than external superhigh intensity cold rolling dual phase steel continuous annealing process by the way of water quenching+tempering, its cooling capacity can
To reach 1000-2000 DEG C/s, for most domestic steel mill does not also possess the condition of high-strength steel special production line, how not
On the basis of using water quenching+tempering continuous annealing line, using the existing continuous annealing equipment of domestic steel mill using rapid cooling+overaging method production
The more than 700MPa levels superhigh intensity cold rolling dual phase steel with weatherability, becomes the emphasis of Domestic Scientific Research personnel research and development.
CN101376950A discloses " a kind of superhigh intensity cold rolling weather resisting steel plate and its manufacture method ".Its chemical composition
For：C0.09%～0.16%, Si0.20%～0.60%, Mn1.00%～2.00%, P≤0.030%, S≤0.015%, N≤0.008%,
Al0.02%～0.06%, Cu0.20%～0.40%, Cr0.40%～0.60%, Mo0.05%～0.25%,（Nb+Ti）0.04%～
0.08%, other are Fe and inevitable magazine.The steel of the technology, 700～1000MPa of its yield strength, tensile strength 800～
1070MPa, elongation percentage 5～14%.But with the addition of precious metal Mo in its chemical composition, the present invention in contrast, with more cost
Advantage.
CN101553586A discloses " formable high strength cold-rolled steel sheet and its manufacture method with excellent weather resistance ".
Its chemical composition is：C0.10%～0.20%, Si0.05%～0.25%, Mn1.0%～2.5%, P≤0.020%, S≤0.010%,
Al0.02%～0.07%, Nb0.02%～0.08%, Ni0.05%～0.30%, Cu0.1%～0.5%, Cr0.8%～1.5%,
Co0.01%～0.10%, and the iron of surplus and other inevitable impurity.Technology disclosed in the document is in 1150 to 1300
DEG C reheat, in 750 to 930 DEG C of final rolling temperature hot rolling, batch in 400 to 650 DEG C,（+ 30 DEG C of A1 transition points）Extremely（A3 turns
Height is following）Continuous annealing.The steel yield strength maximum of the technology is in below 500MPa.
CN102011060A discloses " cold-rolled steel sheet and its manufacture method that a kind of 700MPa levels have excellent weather resistance ".
Its chemical composition is：C0.03%～0.07%, Si≤0.35%, Mn0.1%～1.8%, P≤0.020%, S≤0.010%, Cu0.25%
～0.50%, Cr0.25%～0.80%, Ni0.05%～0.30%, Ti0.06%～0.20%, other are remaining for Fe and inevitably miscellaneous
Matter.Technology disclosed in the document makes the steel anneal in bell type annealing furnace within the temperature range of 500 DEG C to A1 transition points.
This technology is suitable only for small lot batch manufacture, it is difficult to meet the demand produced in enormous quantities, and the uniformity of coil of strip entire volume is difficult to ensure.
The content of the invention
It is an object of the invention to overcome the problems referred to above and deficiency and provide a kind of superhigh intensity with weatherability
Cold-rolled biphase steel and its manufacture method, the steel plate yield strength can reach more than 700MPa, meet container, automobile and other industries
Demand to ultra-thin, ultrahigh-strength steel plates.
What the object of the invention was realized in：
Superhigh intensity cold rolling dual phase steel with weatherability, it is characterised in that the composition of the steel plate is by weight percentage
（wt.%）Meter is as follows：C：0.10%～0.16%, Si：0.10%～0.50%, Mn：1.4%～2.2%, Cr：0.30%～0.79%,
Ni：0.08%～0.20%, Cu：0.20%～0.50%, Nb：0.01%～0.05%, Ti：0.02%～0.05%, Al：0.015%～
0.045%, P≤0.020%, S≤0.007%, N≤0.008%, balance of Fe and inevitable impurity.
Steel plate microstructure is mainly made up of ferrite+martensite, it is also possible to there is a small amount of bainite, by area percentage
Meter：Ferrite is 57%-70%, and martensite is 30%-40%, and bainite is 0-3%.
Present component design reason is as follows：
C is important intensified element, improves the intensity of martensite, affects the content of martensite.C content is too low, same to face
Ovshinsky scale of construction when battery limit (BL) annealing temperature is heated in ferrite and austenite two-phase section is reduced, and the martensite volume for obtaining also accordingly subtracts
Few, it is difficult to proof strength, C content is too high to be unfavorable for welding performance, and in steel of the present invention, C content is controlled 0.10%～0.16%.
Si is ferrite former, and it accelerates segregation of the carbon to austenite, ferrite is further purified, while Si can
With expand ferrite, austenite two-phase section, make critical zone process temperature range widen, Si too high levels be unfavorable for weldability and
Plate surface quality, in steel of the present invention, Si contents are controlled 0.10%～0.50%.
Mn can improve the quenching degree of steel, thus after reducing two-phase section heating, obtained in cooling procedure, martensite is critical
Cooling velocity.But Mn too high levels, it is easy to form the martensite banded structure of high rigidity, it is unfavorable to structural homogenity, this
In bright steel, Mn contents are controlled 1.4%～2.2%.
Cr improves the quenching degree and atmospheric corrosion resistance of steel, can cause crevice corrosion when the amount of Cr is more than 0.80%, and
Production cost is dramatically increased, while reducing plasticity and toughness, Cr contents are controlled 0.30%～0.80% in steel of the present invention.
Ni improves the quenching degree of steel, improves the atmospheric corrosion resistance ability of steel, while reinstate with Cu mono- to improve steel containing Cu
It is easy to produce hot-short problem, but which is expensive, Ni contents is controlled 0.08%～0.20% in steel of the present invention.
Cu improves the quenching degree and atmospheric corrosion resistance of steel, is less than 0.20% when the amount of copper is added, it is difficult to needed for ensureing
Corrosion resistance, when the amount of the copper for adding is more than 0.50%, may produce grain-boundary crack, the table of hot rolled plate in the casting process of steel
Face is likely to become coarse.In steel of the present invention, Cu contents are controlled 0.20%～0.50%.
Nb is strong carbonitride-forming elements, can form tiny carbide and nitride, suppresses the length of austenite crystal
Greatly, recrystallization temperature can be improved in the operation of rolling, suppress the recrystallization of austenite, deformation effects are kept so as to refine iron element
Body crystal grain, and the reinforced ferrite matrix in the form of precipitate.In steel of the present invention, Nb contents are controlled 0.01%～0.05%.
Ti forms TiN highly stable under high temperature, suppresses the crystal grain of austenite long during the reheating before hot-working
Greatly.Ti content it is too low by the TiN that can not obtain enough volume fractions effectively preventing grain coarsening, Ti content is too high will cause it is thick
Big liquid separates out the appearance of TiN and can not play a part of to prevent crystal grain from growing up.In steel of the present invention, Ti contents are controlled 0.02%
～0.05%.
What Al was added for deoxidation and crystal grain are adjusted, can be combined with nitrogen, the harm of elimination nitrogen, and can crystal grain thinning, work as aluminium
When adding excessive, the field trash formed in steel increases and makes the deteriorated workability of steel.Al content control in steel of the present invention exists
0.015%～0.045%.
N is element present in smelting process, needs to be controlled in certain scope.In the present invention control N≤
0.008%, preferably N≤0.006%.
P and S is impurity element in steel, significantly reduces plasticity and toughness and welding performance, controls relatively low P, S and is conducive to raising property
Energy.P≤0.020%, S≤0.007% are controlled in steel of the present invention.
The manufacture method of the superhigh intensity cold rolling dual phase steel with weatherability, including smelting-continuous casting-heating-hot rolling-
Cold rolling-continuous annealing-smooth,
（1）According to above-mentioned chemical composition through smelting, continuous casting obtains block；
（2）By the block through heating, hot-rolled process, hot rolled plate is obtained, relation reheating temperature is more than 1250 DEG C,
1040 DEG C～1100 DEG C of finish rolling start rolling temperature, 880 DEG C～930 DEG C of finishing temperature, coiling temperature are 580 DEG C～660 DEG C；
（3）Cold rolling reduction ratio is 60%～70%；
（4）Continuous annealing is using 750 DEG C～810 DEG C insulation 110s～170s, 750 DEG C～810 DEG C insulations, if be less than
750 DEG C, then enough austenites can not be formed, if temperature is more than 810 DEG C, can be increased due to the volume fraction of austenite,
In austenite, carbon and alloying element are reduced, and the quenching degree on austenite island declines；And be cooled to 3 DEG C/s～10 DEG C/s speed jets
680 DEG C～710 DEG C, the section cooling ensures that austenite low decomposes.Temperature is too low, causes austenite excessively to decompose, and temperature is too high, then
It is unfavorable for plate shape；Then 200 DEG C～260 DEG C are cooled to the cooling rate jet of 40 DEG C/s～60 DEG C/s, in order to ensure that austenite fills
Divide to martensite transfor mation, it is necessary to increase cooling rate.Temperature is higher than 260 DEG C, and martensite volume is inadequate；Temperature is less than 200 DEG C, beyond equipment
Capacity limit；Then 340 DEG C～400 DEG C tempering 300s～520s are heated to, overaging temperature is too low, and martensite island can not be divided
Solution, causes yield strength not enough；Overaging temperature is too high, and martensite island decomposes excessive, causes tensile strength to decline excessive, it is impossible to
Meet and require；
（5）Carry out smooth again through 0.8%～1.4% smooth elongation percentage, smooth is the important procedure of cold rolling production, it is main to make
With the yield point elongation for being elimination annealed strip.Why the present invention adopts more than 0.8% smooth elongation percentage, is in order that strip
Again there is processing hardening, improve yield strength, and be higher than 1.4% beyond capacity of equipment.
The present invention is by rational composition design and is equipped with suitable continuous annealing process, in containing for moderate carbon and alloying element
Under amount, the superhigh intensity cold rolling dual phase steel with weatherability is obtained, steel plate yield strength reaches more than 700MPa, tensile strength
More than 800MPa, superhigh intensity cold rolling dual phase steel with weatherability of the elongation percentage more than 5%, and there is fine grain ferrite
With martensite duplex structure, it is also possible to there is a small amount of bainite, by area percentage：Ferrite is 57%-70%, martensite
For 30%-40%, bainite is 0-3%, and ferrite average grain size is 2.2 μm, is also dispersed with one in addition on ferrite matrix
Quantitative alloyed cementite.Can just be produced using the continuous annealing mode of air cooling+overaging, it is not necessary to water quenching ability
Continuous annealing apparatus, exempt the operation of pickling, and surface quality is more preferable, it is easier to produce, it is adaptable to container and automobile and other industries
Lightweight growth requirement, with certain application prospect.
Description of the drawings
Fig. 1 is the micro-organization chart of steel embodiment of the present invention 2.
Fig. 2 is the precipitated phase of steel embodiment of the present invention 2.
Fig. 3 is the energy spectrogram of steel embodiment of the present invention 2.
Specific embodiment
Below by embodiment, the present invention is further illustrated.
Component proportion of the embodiment of the present invention according to technical scheme, carries out smelting, continuous casting, rolling, continuous annealing, smooth.
The smelting composition of embodiment of the present invention steel is shown in Table 1.The main technologic parameters of embodiment of the present invention steel are shown in Table 2.The embodiment of the present invention
The performance of steel is shown in Table 3.Embodiment of the present invention steel salt spray corrosion test the results are shown in Table 4.
The smelting composition of 1 embodiment of the present invention steel of table, wt%
The main technologic parameters of 2 embodiment of the present invention steel of table
The performance of 3 embodiment of the present invention steel of table
4 salt spray corrosion test result of table
As atmospheric exposure test, the salt spray test of 31 day, spray amount 1-2ml/ are carried out at 35 DEG C in 5%NaCl solution
h.The results are shown in Table 4.The atmospheric corrosion resistance of steel of the present invention is substantially better than Q235, is on close level with SPA-H material objects.
Claims (3)
1. there is the manufacture method of the superhigh intensity cold rolling dual phase sheet steel of weatherability, it is characterised in that the composition of the steel plate is pressed
Percentage by weight (wt.%) meter is as follows：C：0.10%～0.16%, Si：0.10%～0.50%, Mn：1.4%～2.2%,
Cr：0.30%～0.79%, Ni：0.08%～0.20%, Cu：0.20%～0.50%, Nb：0.01%～0.05%, Ti：
0.02%～0.05%, Al：0.015%～0.045%, P≤0.020%, S≤0.007%, N≤0.008%, balance of Fe
And inevitable impurity；
The manufacture method, including smelting-continuous casting-heating-hot rolling-cold rolling-continuous annealing-smooth,
(1) according to above-mentioned steel plate chemical composition through smelting, continuous casting obtains block；
(2) by the block through heating, hot-rolled process, hot rolled plate is obtained, relation reheating temperature is more than 1250 DEG C, finish rolling
1040 DEG C～1100 DEG C of start rolling temperature, 880 DEG C～930 DEG C of finishing temperature, coiling temperature are 580 DEG C～660 DEG C；
(3) cold rolling reduction ratio is 60%～70%；
(4) continuous annealing is incubated 110s～170s using 750 DEG C～810 DEG C, and is cooled to 3 DEG C/s～10 DEG C/s speed jets
680 DEG C～710 DEG C, then 200 DEG C～260 DEG C are cooled to the cooling rate jet of 40 DEG C/s～60 DEG C/s, are then heated to 340
DEG C～400 DEG C of tempering 320s～520s；
(5) smooth elongation percentage is 0.8%～1.4%.
2. there is the manufacture method of the superhigh intensity cold rolling dual phase sheet steel of weatherability according to claim 1, its feature exists
In steel plate microstructure is mainly made up of ferrite+martensite, it is also possible to there is a small amount of bainite, by area percentage：Iron
Ferritic is 57%-70%, and martensite is 30%-40%, and bainite is 0-3%.
3., such as the manufacture method of the superhigh intensity cold rolling dual phase sheet steel with weatherability described in claim 1 or 2, which is special
Levy and be, the steel plate, its yield strength are more than 700MPa, and tensile strength is more than 800MPa, elongation percentage A50mmFor 5% with
On.
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| CN114107786A (en) * | 2020-08-27 | 2022-03-01 | 宝山钢铁股份有限公司 | Cold-rolled high-corrosion-resistance high-strength weathering steel and manufacturing method thereof |
| CN114381580B (en) * | 2020-10-19 | 2023-12-12 | 宝山钢铁股份有限公司 | Cover annealing process and manufacturing method of high corrosion-resistant weather-resistant steel |
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| KR100815799B1 (en) * | 2006-12-12 | 2008-03-20 | 주식회사 포스코 | Cold-rolled steel sheet with high yield ratio and excellent weather resistance |
| CN101348885B (en) * | 2008-09-11 | 2010-06-02 | 北京科技大学 | 1000MPa grade cold rolling hot dip galvanizing two-phase steel and manufacturing method thereof |
| CN102021483B (en) * | 2010-12-06 | 2012-10-10 | 北京科技大学 | Cold-rolled dual-phase steel plate with 1,200 MPa-level tensile strength and preparation method thereof |
| CN102839329B (en) * | 2012-08-06 | 2014-10-15 | 马钢(集团)控股有限公司 | Cold-rolling double-phase-steel steel plate with tensile strength of 450 MPa, and preparation method thereof |
| CN103060703B (en) * | 2013-01-22 | 2015-09-23 | 宝山钢铁股份有限公司 | A kind of cold rolling diphasic strip steel of 780MPa level and manufacture method thereof |
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