CN107385319A - Yield strength 400MPa level Precision Welded Pipe steel plates and its manufacture method - Google Patents

Yield strength 400MPa level Precision Welded Pipe steel plates and its manufacture method Download PDF

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Publication number
CN107385319A
CN107385319A CN201610323841.5A CN201610323841A CN107385319A CN 107385319 A CN107385319 A CN 107385319A CN 201610323841 A CN201610323841 A CN 201610323841A CN 107385319 A CN107385319 A CN 107385319A
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China
Prior art keywords
yield strength
steel plate
welded pipe
rolled steel
precision welded
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CN201610323841.5A
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Inventor
段争涛
裴新华
夏小明
郭园园
凌爱兵
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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Priority to CN201610323841.5A priority Critical patent/CN107385319A/en
Publication of CN107385319A publication Critical patent/CN107385319A/en
Pending legal-status Critical Current

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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
    • C21D8/0221Modifying 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
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • 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
    • 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
    • C21D2211/009Pearlite

Abstract

The present invention relates to yield strength 400MPa level Precision Welded Pipe steel plates and its manufacture method, mainly solves the technical problem of yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate industrialized production.Yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate provided by the invention, its chemical component weight percentage are:C:0.20~0.30%, Si≤0.10%, Mn:1.0~1.40%, P≤0.02%, S≤0.01%, N≤0.0060%, Al:0.015~0.060%, Ti:0.01~0.03%, surplus is iron and is unavoidably mingled with.The yield strength of hot rolled steel plate is 440~550MPa, and tensile strength is 550~650MPa, and elongation after fracture A is 25~35%.Hot rolled steel plate of the present invention is applied to make vehicle structure Precision Welded Pipe.

Description

Yield strength 400MPa level Precision Welded Pipe steel plates and its manufacture method
Technical field
The present invention relates to a kind of Precision Welded Pipe steel plate, more particularly to a kind of yield strength 400MPa levels Precision Welded Pipe hot-rolled steel Plate and its manufacture method, belong to technical field of iron-base alloy.
Background technology
Precision Welded Pipe is the fine product in welded tube product.Compared with common welded tube, have uniform wall thickness, steel pipe geometry it is good, Ovality is small, weldquality is reliable and inner burr is small, outer surface is bright and clean, and steel pipe is heat-treated through weld seam or protective atmosphere is heat-treated Afterwards, can reach surface non-oxidation, stable mechanical property and the uniform effect of metallographic structure, its dimensional accuracy higher than seamless pipe and Production cost is much lower compared with same type seamless precision steel pipe.
With the development of automobile industry, partial automobile accessory enterprise propose utilize hot rolled steel plate, through overpickling, slitting, roll-in, The technique productions welded tubes such as welding, to replace seamless steel pipe, Precision Welded Pipe then is made through techniques such as Overheating Treatment, cold-drawns, is used for Make automobile precision structural member, such as damper link.Because Precision Welded Pipe manufacturing procedure is more, forming technology is complicated, to heat Steel rolling plate surface, quality and performance are proposed higher requirement.
Chinese Patent Application No. 200810048305.4 discloses a kind of yield strength 355MPa levels super fine organization hot rolling carbon steel band Manufacture method, use the chemical composition of 200MPa or so carbon steel by suitable hot rolling technology by crystal grain refinement to 5 microns with Under, the toughness of steel plate increases substantially, and possesses the performances such as good shaping, welding, and yield strength in kind reaches 400MPa, its Chemical composition is C:0.08~0.316%, Si:0.10~0.40%, Mn:0.40~0.90%, Alt >=0.01%, employ low C, contain Si is designed.
Chinese Patent Application No. 201410203654.4 discloses inexpensive yield strength 400MPa levels steel band and its manufacture method, Using low silicomanganese (Si:≤ 0.03%, Mn:0.20~0.40%), boron micro-alloyed (0.0009~0.0030%) is designed, and is applicable thickness Spend 1.0~3.5mm.
Chinese Patent Application No. 201210270618.0 discloses a kind of production method of copper facing Precision Welded Pipe steel band, its chemistry into It is divided into C:≤ 0.002%, Si:≤ 0.01%, Mn:0.11~0.15%, P≤0.01%, S≤0.01%, N≤0.0030%, Alt: 0.02~0.04%, Ti:0.05~0.08%.Using low-carbon low Mn designs, hot rolled coil through cold rolling, annealing, it is smooth after thickness be 0.45~0.80mm, yield strength are 170~230MPa, and tensile strength is 280~320MPa.
Document《The trial-production of φ 89mm × 2.5mm electric welded steel pipes used for vehicle transmission shaft》(Lv fruit, welded tube, 2003,26 (5): 30-32) disclose a kind of manufacture method of electric welded steel pipe, raw material SS400.C in the composition in kind of offer:0.2%, Si:0.21%, Mn:0.57%, 2.5mm material object yield strength 350MPa, tensile strength 485MPa, elongation after fracture 40%.
Document《The development of high-strength vehicle power transmission shaft cold drawing accurate welded tube》(Liu Cailing, world steel, 2010,1:65-70.) Disclose two kinds of component systems of B440QZR, B480QZR.Nb (≤0.04%), hot-rolled steel are with the addition of in wherein B440QZR Plate yield strength is in below 400MPa.
Document《The development of automobile absorber cylinder body Precision Welded Pipe》(Wu Youcai etc., steel research journal, 1998,10 (1): The method for adding the method for cold-drawn cold rolling to produce ribbon steel using welded tube 74-76) is disclosed, it is using Q235 wide flat steels.
Therefore, Precision Welded Pipe disclosed in prior art with hot rolled steel plate yield strength in below 400MPa, it is impossible to meet accurate The demand that welded tube manufacturing enterprise is lifted to armor plate strength.
The content of the invention
It is an object of the invention to provide a kind of yield strength 400MPa level Precision Welded Pipe hot rolled steel plates and its manufacture method, mainly Solves the technical problem of yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate industrialized production.
The present invention is designed with reference to suitable hot rolling technology, protected by C-Mn component bases, being designed using Rational Composition Card product has the processing performance such as good mechanical property and clod wash, welding, meets the processing requests such as high-frequency welding, cold-drawn.
The technical solution adopted by the present invention is:A kind of yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate, its chemical composition Percentage by weight is:C:0.20~0.30%, Si≤0.10%, Mn:1.0~1.40%, P≤0.02%, S≤0.01%, N≤0.0060%, Al:0.015~0.060%, Ti:0.01~0.03%, surplus is iron and is unavoidably mingled with.
The reasons why chemical composition of yield strength 400MPa level hot rolled steel plates of the present invention limits within the above range is as follows:
Carbon:Carbon is this component system essential element, and carbon is most cheap alloying element, favourable to raising armor plate strength, this composition System makes full use of C invigoration effect.But too high content can form more thick brittle carbide particle in steel, to modeling Property and toughness it is unfavorable, be also unfavorable for welding, therefore, the present invention considers C and Mn invigoration effect, the C content of setting For 0.20~0.30%.
Manganese:Manganese is also this component system essential element, can play a part of solution strengthening, and improve intensity important element it One.Mn can expand austenitic area simultaneously, reduce ferrite transformation temperature, expand rolling mill practice window.But Mn contents height can drop Low toughness of material, deteriorate performance, be unfavorable for welding.In view of C scopes in present component system, further limit Mn and contain Measure as 1.0%~1.4%.
Carbon and manganese are the key elements of product final performance after ensureing to be heat-treated, in order to ensure hot rolled steel plate stable performance, Ying Yan Lattice control range.
Silicon:Although silicon, which is solid-solubilized in steel matrix, obvious reinforcing effect, silicone content is too high to steel plate plasticity and toughness It is unfavorable, while the serious red iron sheet of the rust for being difficult to remove can be formed in hot rolling plate surface, influence the processes such as rear process pickling, cold-drawn Surface quality requirements.The present invention limits Si≤0.10%.
Sulphur and phosphorus:Sulphur and P elements are too high to be adversely affected to toughness of material and plasticity, and Liu can increase refining He Lin is too low again The desulfurization of steel and dephosphorization cost.The present invention limits S≤0.01%, P≤0.02%.
Nitrogen:The plasticity and toughness of the too high meeting severe exacerbation material of nitrogen content, the present invention limit N≤0.006%.
Aluminium:The effect of aluminium in the present invention is to play a part of deoxidation, and aluminium is strong oxidizing property formation element, and oxygen forms Al in steel2O3 Removed in steel-making.Aluminium is too high to form excessive Al2O3It is mingled with, and sprue gate is easily blocked during continuous casting.This hair The bright Al content that limits is 0.015%~0.060%.
Titanium:Titanium forms the effective fining austenite grains of TiN precipitated phases in high temperature, and TiC precipitated phases are formed in low temperature, are compared Tiny, disperse precipitated phase is readily obtained, improves intensity, minimal amount of Ti is with regard to that can obtain significantly strengthening effect.In addition Ti Be added be beneficial to improve material welding performance.The present invention limits Ti contents as 0.01~0.03%.
The component system of the present invention, it is desirable to when smelting, the strict chemical composition for controlling molten steel.The component system of the present invention is further The hot rolling technology set with reference to the present invention, produce stable performance, quality meets the hot rolled steel plate of requirement.
A kind of manufacture method of yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate, this method include:
Molten steel obtains continuous casting steel billet through continuous casting, wherein the percentage by weight of the ladle chemistry is:C:0.20~0.30%, Si ≤ 0.10%, Mn:1.0~1.40%, P≤0.02%, S≤0.01%, N≤0.0060%, Al:0.015~0.060%, Ti: 0.01~0.03%, surplus is iron and is unavoidably mingled with;
Continuous casting steel billet carries out hot rolling, described hot rolling is rolled using two-stage control in 1200~1230 DEG C after heating 150~240min Technique processed, roughing are 6 passes, are rolled more than austenite recrystallization temperature, and roughing end temp is 1000~1100 DEG C; Finish rolling is 7 passage tandem rollings, and 1000~1050 DEG C of entry temperature at finishing, finish rolling end temp is at 810~850 DEG C;After finish rolling, steel plate Finished product thickness is 2.0~8.0mm, and section cooling is cooled down using leading portion, 20~40 DEG C/s of cooling velocity, and coiling temperature is 540~600 DEG C When batch to obtain coils of hot-rolled steel.
Hot rolling technology is the key problem in technology for realizing the present invention, by calculating, present component system A3For 798 DEG C, A1For 702 ℃.The hot rolling technology that the present invention is taken is all based on present component system and the transformation temperature calculated, and specific reason is as follows:
1st, the setting of continuous casting steel billet heating-up temperature and heat time
Being set at for continuous casting steel billet acid extraction ensures to eliminate the component segregation formed in continuous casting billet solidification processing, dredged Pine, and the defects of the steel slab surface of part, ensure composition, microstructure homogenization.But heating-up temperature is too high, or overlong time, Slab original structure is thick, serious plus surface oxidation decarburization, is unfavorable for steel plate final performance, especially surface quality.According to Chemical composition system of the present invention, continuous casting steel billet heating-up temperature is set as 1200~1230 DEG C, the heat time is 150~240min.
2nd, roughing end temp is set
Rolling process of rough rolling control rolls more than austenite recrystallization temperature, it is ensured that obtains uniformly tiny austenite crystal.Cause This present invention sets roughing end temp as 1000~1100 DEG C.
3rd, finish rolling end temp is set
The final rolling temperature of the present invention acts on of both being set with, and is on the one hand rolled by austenite Unhydrated cement, obtains inside There is the flat austenite crystal of Zona transformans, be transformed into the small ferrite and pearlite of relatively thin in subsequent laminar cooling process Crystal grain, the effect of refined crystalline strengthening is played, improve armor plate strength.It is on the other hand, of a relatively high for the carbon content of the present invention, Final rolling temperature setting will also prevent steel plate from forming the banded structure defect of obvious exception.Further binding isotherm result of calculation, this Invention sets finish rolling end temp as 810~850 DEG C.
4th, section cooling speed is set after finish rolling
Section cooling speed is also very crucial after the finish rolling that the present invention is set, using fast section cooling speed come suppress ferrite and Pearlitic structrure is grown up, and avoids the formation of banded structure, and cooling velocity is excessively slow, and ferrite and pearlite is substantially roughened, and enters Process processing and heat treatment after one step influences;Cooling velocity is too fast, and very big influence can be brought on plate shape.Therefore laminar flow of the present invention is cold But cooled down using conventional leading portion, 20~40 DEG C/s of cooling velocity.
5th, hot-rolling coiling temperature is set
Hot-rolling coiling temperature mainly influences the tissue and performance of strip.The too high ferrite of hot-rolling coiling temperature, pearlitic structrure can be anxious Play is grown up, and reduces armor plate strength;Coiling temperature is too low, then organize in the hard phase such as bainite occurs, be unfavorable for slitting, roll-in, The rear process processing such as welding.With reference to present component system, tissue and stability, present invention setting hot rolling are further considered Coiling temperature is 540~600 DEG C.
The yield strength 400MPa level Precision Welded Pipe hot rolled steel plates that the present invention obtains, microscopic structure are thin ferrite+pearlite group To knit, the grain size number of tissue is 8~10 grades, and the yield strength of steel plate is 440~550MPa, and tensile strength is 550~650MPa, Elongation after fracture A is 25~35%.Hot rolled steel plate of the present invention is applied to make vehicle structure Precision Welded Pipe.
The present invention has following good effect compared with prior art:1st, the present invention is by using C-Mn composition designs, fully profit Invigoration effect and easy processing characteristic with C, Mn, provided convenience for the processing of rear process tubulation.2nd, it is of the invention into split System, designed with reference to suitable hot rolling technology, obtained yield strength 400MPa level Precision Welded Pipe hot rolled steel plates, with same intensity The other steel plates of rank are compared, and tissue, stable performance, can better meet the technological requirements such as welding, shaping, cold-drawn, heat treatment, Reduce Precision Welded Pipe manufacturing cost.3rd, hot rolled steel plate of the present invention, grain size number are 8~10 grades, and yield strength is 440~550MPa, tensile strength are 550~650MPa, and elongation after fracture is 25~35%, meets Precision Welded Pipe manufacturing enterprise pair The demand of steel plate yield strength lifting, has filled up industry blank.
Brief description of the drawings
Fig. 1 is the metallographic structure photo of the hot rolled steel plate of the embodiment of the present invention 1.
Embodiment
With reference to embodiment 1~4, the present invention will be further described, as shown in table 1~3.
Table 1 is the chemical composition (by weight percentage) of steel of the embodiment of the present invention, and surplus is Fe and inevitable impurity.
The chemical composition of the steel of the embodiment of the present invention of table 1, unit:Percentage by weight.
According to material composition design requirement of the present invention, using molten iron pre-desulfurization, converter top bottom blowing, LF blows Ar processing, Appropriate calcium line is fed simultaneously, carries out Calcium treatment, and continuous casting uses low-carbon steel protecting slag, and whole process blows Ar protective castings, is cast into continuous casting Slab.
After the heated stove heat of continuous casting steel billet, rolled on hot tandem rolling mill, hot rolling technology control parameter is shown in Table 2, passes through roughing After milling train and finish rolling Continuous mill train controlled rolling, cooling is controlled, is then batched, produces hot-rolled sheet coil, hot-rolled steel Board finished product thickness is 2.0~8.0mm.
The hot rolling technology control parameter of the embodiment of the present invention of table 2
The yield strength 400MPa level Precision Welded Pipe hot rolled steel plates obtained using the above method.Reference picture 1, hot rolled steel plate show Micro-group is woven to thin ferrite+pearlite, and the grain size of tissue is 8~10 grades.
By the obtained hot rolled steel plate of the present invention according to《GB/T228.1-2010 metal material stretching test part 1s:Room temperature is tried Proved recipe method》Tension test is carried out, according to《GB/T 232-2010《Bend test of metal materials method》Carry out bend test, Its mechanical property is shown in Table 3.
The hot rolled steel plate that the present invention obtains has good obdurability, weldability and brake forming, the yield strength of hot rolled steel plate For 440~550MPa, tensile strength is 550~650MPa, and elongation after fracture A is 25~35%, 180 ° of bend tests, d=0a, It is qualified.
The mechanical property of the hot rolled steel plate of the embodiment of the present invention of table 3
In addition to the implementation, the present invention can also have other embodiment.All skills formed using equivalent substitution or equivalent transformation Art scheme, all fall within the protection domain of application claims.

Claims (5)

1. a kind of yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate, its chemical component weight percentage are:C:0.20~0.30%, Si≤0.10%, Mn:1.0~1.40%, P≤0.02%, S≤0.01%, N≤0.0060%, Al:0.015~0.060%, Ti: 0.01~0.03%, surplus is iron and is unavoidably mingled with.
2. yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate as claimed in claim 1, it is organized as thin ferrite+pearly-lustre Body tissue, the grain size of the tissue is 8-10 levels.
3. yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate as claimed in claim 1 or 2, its 2.0~8.0mm thickness hot rolling The yield strength of steel plate is 440~550MPa, and tensile strength is 550~650MPa, and elongation after fracture A is 25~35%.
4. a kind of manufacture method of yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate, including:
Molten steel obtains continuous casting steel billet through continuous casting, wherein the percentage by weight of the ladle chemistry is:C:0.20~0.30%, Si ≤ 0.10%, Mn:1.0~1.40%, P≤0.02%, S≤0.01%, N≤0.0060%, Al:0.015~0.060%, Ti: 0.01~0.03%, surplus is iron and is unavoidably mingled with;
Continuous casting steel billet carries out hot rolling, described hot rolling is rolled using two-stage control in 1200~1230 DEG C after heating 150~240min Technique processed, roughing are 6 passes, are rolled more than austenite recrystallization temperature, and roughing end temp is 1000~1100 DEG C; Finish rolling is 7 passage tandem rollings, and 1000~1050 DEG C of entry temperature at finishing, finish rolling end temp is at 810~850 DEG C;Laminar flow after finish rolling Cooling is cooled down using leading portion, 20~40 DEG C/s of cooling velocity, and coiling temperature batches to obtain coils of hot-rolled steel when being 540~600 DEG C.
5. the manufacture method of yield strength 400MPa levels Precision Welded Pipe hot rolled steel plate as claimed in claim 4, it is characterised in that After finish rolling, it is 2.0~8.0mm to control steel plate finished product thickness.
CN201610323841.5A 2016-05-16 2016-05-16 Yield strength 400MPa level Precision Welded Pipe steel plates and its manufacture method Pending CN107385319A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109023049A (en) * 2018-08-10 2018-12-18 首钢集团有限公司 A kind of carrying roller welded still pipe and its manufacturing method
CN109536846A (en) * 2017-09-21 2019-03-29 上海梅山钢铁股份有限公司 Yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method
CN112430787A (en) * 2019-08-26 2021-03-02 上海梅山钢铁股份有限公司 Low-yield-ratio high-strength cold-rolled hot-dip galvanized steel plate and manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101186994A (en) * 2007-10-15 2008-05-28 莱芜钢铁集团有限公司 Micro-alloying steel for oil gas transport seamless pipeline and its preparation method
CN102400039A (en) * 2010-09-07 2012-04-04 鞍钢股份有限公司 Slurry feed line steel with good low-temperature toughness and manufacturing method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101186994A (en) * 2007-10-15 2008-05-28 莱芜钢铁集团有限公司 Micro-alloying steel for oil gas transport seamless pipeline and its preparation method
CN102400039A (en) * 2010-09-07 2012-04-04 鞍钢股份有限公司 Slurry feed line steel with good low-temperature toughness and manufacturing method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109536846A (en) * 2017-09-21 2019-03-29 上海梅山钢铁股份有限公司 Yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method
CN109536846B (en) * 2017-09-21 2020-12-08 上海梅山钢铁股份有限公司 High-toughness hot-rolled steel plate with yield strength of 700MPa and manufacturing method thereof
CN109023049A (en) * 2018-08-10 2018-12-18 首钢集团有限公司 A kind of carrying roller welded still pipe and its manufacturing method
CN112430787A (en) * 2019-08-26 2021-03-02 上海梅山钢铁股份有限公司 Low-yield-ratio high-strength cold-rolled hot-dip galvanized steel plate and manufacturing method thereof

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Application publication date: 20171124