CN104264052B - Steel plate for engineering machinery and production method thereof - Google Patents
Steel plate for engineering machinery and production method thereof Download PDFInfo
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- CN104264052B CN104264052B CN201410593263.8A CN201410593263A CN104264052B CN 104264052 B CN104264052 B CN 104264052B CN 201410593263 A CN201410593263 A CN 201410593263A CN 104264052 B CN104264052 B CN 104264052B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 107
- 239000010959 steel Substances 0.000 title claims abstract description 107
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 18
- 238000005496 tempering Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 15
- 238000005098 hot rolling Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000009749 continuous casting Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 abstract description 8
- 239000000725 suspension Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 13
- 238000003723 Smelting Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 5
- 229910001567 cementite Inorganic materials 0.000 description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000013000 roll bending Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a steel plate for engineering machinery and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: 0.05-0.09% of C, 0.05-0.30% of Si, 1.5-2.0% of Mn, less than or equal to 0.025% of P, less than or equal to 0.005% of S, 0-0.07% of Nb, 0.08-0.15% of Ti, 0.10-0.30% of Mo, 0.015-0.06% of Als, 0.0010-0.0030% of Ca, less than or equal to 0.006% of N, and the balance of Fe, wherein the thickness of the steel plate is 3.0-8.5 mm. The invention adopts advanced ultra-fast cooling equipment and a domestic unique 2250mm wide strip steel heat treatment line for production, has the advantages of large margin of strength and elongation, good impact toughness and small post-weld strength loss rate, particularly shows small anisotropy, small unevenness value and excellent bending property of a steel plate, and is suitable for manufacturing the suspension arm of engineering machinery vehicles such as a crane and the like.
Description
Technical field
The present invention relates to high-strength high-toughness steel plate and production method thereof that a kind of yield strength is 700MPa level, especially relate to
And it is a kind of for engineering machinery arm steel plate and production methods thereof such as cranes.
Background technology
Light-weight design has been widely used in Space Science and Technology, automobile, electronic industry, but engineering machinery vehicle neck at home
Territory, for crane, this field still belongs to the starting stage.Realize crane core component arm
Lightweight, can significantly reduce the workload of crane, improves rated power, it is achieved the leap of equipment performance.Use has good
Good mechanical property and the high-strength high-toughness steel plate of serviceability, can alleviate the weight of crane arm well, it is achieved
Light-weighted target.
For the main technical requirements bag that high-level large-tonnage yield strength is 700MPa level crane arm steel
Include: (1) steel plate thickness specification is mainly at 4 ~ 8mm；(2) mechanical property: yield strength (Rel/Rp0.2) >=700MPa, tension is strong
Degree (Rm) >=785MPa, elongation after fracture (A) >=15% ,-20 DEG C of ballistic work (Akv) >=40J, 2 times of bending moment bendings 180 ° are qualified；
(3) plate shape require: glacing flatness need to control at below 3mm/m, otherwise, after die mould arm part easily occur U-type groove both sides the most contour,
Asymmetric, and lower arch the defect such as upwarps；(4) steel plate serviceability: good (the lap joint CTS weld crack rate of welding performance
≤ 3%, deposited strength >=750MPa), buckling performance is superior, and (without specific targets, current domestic steel plate once checks the qualification rate to be
60 ~ 70%).
Based on the crane arm reason of steel thickness specification, steel plate is nearly all by conventional hot continuous rolling machine production line next life
Produce.Production technology includes TMCP(controlled rolling and controlled cooling) and quenched (quenching+tempering) two kinds, wherein TMCP technology is because operation is shorter,
Production cost is relatively low, and the delivery cycle is short, and the most all of roll bending manufacturing firm is used, and only minority technology is the most advanced
Steel mill, use and roll the quenched mode of rear press quenching+tempering to produce this kind of crane arm 700MPa level steel, represent product
The WELDOX 700 of SSAB company of Pin You Sweden.
The patent application of Application No. 200910083635.1 proposes the life of a kind of high-strength steel with yield strength of 700 MPa
Product method.Production method in this patent, owing to continuous casting and rolling slab thickness is generally 60 ~ 90mm, the total reduction of milling train is little,
And using the highest section cooling of cooling rate, these factors make the surplus capacity of properties of product little, and especially impact flexibility is the most inclined
Low.It addition, patent application for product be hot rolled coil.
The patent application of Application No. 201110366129.0 proposes the hot rolling more than 700 MPa levels of a kind of yield strength
Titaniferous high strength steel plate and manufacture method thereof.This type of steel relies primarily on the precipitation strength of high Ti content to improve intensity, because Ti compares
Active, easily aoxidize during smelting molten steel, and be combined with N, S and lose its effect that super-refinement separates out in ferrite
Really, therefore intensity relative fluctuation is big.And Ti content is the highest, its low-temperature impact toughness declines more obvious, impact easily occurs
The underproof situation of merit.3rd, this patent application for product be hot rolled coil.
The patent application of Application No. 201010101815.0 proposes a kind of low cost non-tune of yield strength 700MPa level
Matter processes high strength steel plate and manufacture method thereof, and this type of steel uses the composition design of low C-Si-Mn-Nb-Ti-Cr, uses in composition
Cr and do not use Mo as quenching degree element.Using compared with Mo with Cr, the carbide stability that both are formed has significant difference,
The temper resistance using Mo is the highest, and obvious intensity will not be brought to decline, and therefore, these type of 700 MPa steel adding Cr are suitableeer
Deliver goods together in hot-rolled state.It addition, product described in this patent is also hot rolled coil.
The patent application of Application No. 201110343384.3 proposes a kind of 750MPa～880MPa level vehicle with high-strength
Steel and production method thereof, its patent application for for hot rolled coil product.
It is high-strength that the patent application of Application No. 201010186720.3 proposes a kind of economical yield strength 690MPa level
Steel plate and manufacture method thereof, the patent application of Application No. 201210209649.5 proposes a kind of without the surrender of nickel high tenacity
700MPa level high-strength steel and manufacture method thereof, the patent application of Application No. 201310269680.2 proposes a kind of tension
800MPa level hydropower station pressure pipeline high strength steel plate and production method.The cut deal that is involved by aforementioned three patent applications produces
Product.
The problem that prior art exists is: more steel enterprise is limited by the restriction of cooling device, and roller repairing speed is slow so that
Intensity is little with low-temperature impact work value surplus capacity.It addition, other steel mill domestic is because lacking wide flat steel heat-treatment production line, all use heat
Roll the crosscutting plate after the crosscutting plate of volume or hot rolled coil slow cooling self tempering or the crosscutting plate after hot rolled coil bell-type annealing is delivered goods, open
Steel plate internal stress after Ping eliminates not thorough, and plate shape glacing flatness is the highest, so that the arm die mould that impact is follow-up.
Summary of the invention
It is an object of the invention to provide a kind of yield strength being applicable to crane lightweight requirements is 700MPa level
Steel for engineering machinery (especially crane arm steel) and production method thereof.
For achieving the above object, the technical solution used in the present invention is:
The described quality plate that a kind of yield strength is 700MPa level, its chemical composition (weight/mass percentage composition) is: C
0.05~0.09、Si 0.05~0.30、Mn 1.5~2.0、P≤0.025、S≤0.005、Nb 0~0.07、Ti 0.08~0.15、Mo
0.10 ~ 0.30, Als 0.015 ~ 0.06, Ca 0.0010 ~ 0.0030, N≤0.006, surplus is Fe, steel plate thickness be 3.0mm ~
8.5mm。
The production method of described a kind of steel for engineering machinery plate, comprises the technical steps that:
Converter or electric furnace smelting → LF+RH refine → continuous casting → heating furnace heating → roughing → finish rolling → ultrafast cold → laminar flow
Cool down → batch → cross section is flat → tempering heat treatment, technological parameter is as follows:
(1) continuous casting steel billet use hot-loading and hot-conveying technique, it is ensured that slab enter heating furnace time charging temperature 300 DEG C with
On, slab heating temperature more than 1200 DEG C.
(2) hot rolling finishing temperature controls at 820 ~ 880 DEG C.
(3) cooling facility for laminar flow using the cooling rate fast cooling device more than 25 DEG C/s or encryption after rolling cools down.
(4) oiler temperature control is at 560 ~ 640 DEG C.
(5) steel plate through open gentle crosscutting after, heat-treatment lines carry out temperature be 550 ~ 650 DEG C, the time be 10 ~ 50min's
Tempering.
Use a kind of steel for engineering machinery plate and production method thereof provided such as technique scheme, with prior art phase
Ratio, has the technical effect that
(1) winding off the crosscutting plate of Heisei hot rolling by hot rolling, the most unique 2250mm wide flat steel heat-treatment lines enters
Row tempering heat treatment.
(2) Q690D, EN 10149-2 in HR700F, GB/T 16270 during mechanical property of steel plate meets GB/T 20887.1
The mechanical property requirements of middle S700MC, performance requirement is: yield strength be more than 700MPa, tensile strength be more than 785MPa ,-20 DEG C
Ballistic work is more than 40J, and elongation percentage is more than 15%, and it is qualified that cold-bending property meets 2 times of moments of flexure bendings 180 °.
(3) in addition to the technology meeting existing yield strength 700MPa level steel for engineering machinery requires, its mechanical property is rich
Surplus foot, it is low, especially because steel plate property anisotropy is little, glacing flatness is high, buckling performance is superior so that crane that postwelding loses strong rate
Manufacturer improves the utilization rate of steel plate, decreases arm part fire school, strikes the links such as school, improves production efficiency.This
The performance indications of bright steel are concrete such as: yield strength >=800MPa, tensile strength >=850MPa, elongation percentage >=18% ,-20 DEG C of impacts
Merit >=80J, the 180 ° of bendings of 2 times of bending moments of clod wash are qualified, steel plate unevenness≤2mm/m, and strong rate ＜ 10% is lost in welding, respectively to poor performance
Different little, steel plate internal stress is little, and buckling performance once checks qualification rate ＞ 90%, exceeds about 30% than other producer's product.
(4) steel of the present invention is also applied for other parts of engineering machinery vehicle, such as concrete mixer arm, concrete mixer car
Body, the position such as crane vehicle body, base plate.
Detailed description of the invention
Below in conjunction with embodiment, the detailed description of the invention of the present invention is further described.
Described steel plate, its chemical composition weight/mass percentage composition is: C 0.05 ~ 0.09, Si 0.05 ~ 0.30, Mn 1.5 ~
2.0、P≤0.025、S≤0.005、Nb 0~0.07、Ti 0.08~0.15、Mo 0.10~0.30、Als 0.015~0.06、Ca
0.0010 ~ 0.0030, N≤0.006, surplus is Fe, and the thickness of steel plate is 3.0mm ~ 8.5mm.
Described steel plate uses the composition design of low C, high Mn, middle Nb, high Ti, low Mo, is sent by steel slab heat and guarantees
The quality problems such as slab not crack initiation not fracture.The organization type of steel plate of the present invention tempering state is polygonal ferrite+a small amount of
Cementite tissue.It is tempered by hot rolled steel plate, on the one hand plays the precipitation-hardening effect of Ti, Nb, Mo element further, to improve
Intensity, on the other hand, steel plate tempering can eliminate internal stress, it is ensured that plate shape, thus meets crane arm to bending
The high request of energy.In composition, each element Main Function is as follows: (1) C: low carbon content, reduces carbon equivalent to improve the welding of steel plate
Performance, meanwhile, appropriate C Yu Ti, Nb, Mo form stable MC two-phase precipitate, increase substantially intensity；(2) Si: solid solution is strong
Changing element, for being used as to need the parts of coating, for improving coating performance, Si content can be controlled by lower limit, such as 0.06%, right
In being used as the parts without coating requirement, Si content can suitably increase, but as far as possible less than 0.3%, more to prevent top layer from being formed
SiO2Product；(3) Mn: solution strengthening improves intensity, it addition, non-recrystallization temperature when high Mn content can improve hot rolling, fills
Dividing utilizes the austenite flattening of finish rolling section to carry out crystal grain thinning；(4) S: control to below 50ppm as far as possible, thus improve effective Ti
Ratio in full Ti；(5) P: for cyrystal boundary segregation element, the low-temperature impact toughness of steel plate can be reduced, but P content is less than
During 0.02wt.%, Toughness is impacted for this hot rolling and tempering state steel plate little；(6) Ti；Strong precipitation strength element, energy
Become TiC super-refinement nano-scaled precipitate with C-shaped, separate out in ferrite, increase substantially intensity；(7) Nb: important crystal grain thinning
Element, additionally plays certain precipitating reinforcing effect；(8) Mo: be on the one hand quenching degree element, promote quasi-polygonal ferrite
Being formed, on the other hand, form compound Second Phase Precipitation thing (Ti, Mo) C with TiC, during tempering, precipitate will not be grown up rapidly, tool
There is good temper resistance.
Described Plate Production method, comprises the technical steps that:
Converter or electric furnace smelting → LF+RH refine → continuous casting → heating furnace heating → roughing → finish rolling → ultrafast cold → laminar flow
Cool down → batch → cross section is flat → tempering heat treatment, technological parameter is as follows:
(1) continuous casting steel billet use hot-loading and hot-conveying technique, it is ensured that slab enter heating furnace time charging temperature 300 DEG C with
On, slab heating temperature more than 1200 DEG C.
(2) hot rolling finishing temperature controls at 820 ~ 880 DEG C.
(3) cooling facility for laminar flow using the cooling rate fast cooling device more than 25 DEG C/s or encryption after rolling cools down.
(4) oiler temperature control is at 560 ~ 640 DEG C.
(5) steel plate through open gentle crosscutting after, heat-treatment lines carry out temperature be 550 ~ 650 DEG C, the time be 10 ~ 50min's
Tempering.
Embodiment 1
At slab caster, smelting in 210 tons of converters the molten steel through LF stove Yu RH stove refine are poured into strand, and it is changed
Learning composition quality percentage composition is: C 0.076, Si 0.21, Mn 1.81, P 0.011, S 0.0017, Als 0.032, Ca
0.0005, Nb 0.060, Ti 0.101, Mo 0.19, remaining is Fe and inevitable impurity.
Slab thickness is 230 mm, rolls at 2250 conventional hot continuous rolling machine production lines, and heating-up temperature is 1240 DEG C, finish rolling
Inlet temperature is 1060 DEG C, and workpiece thickness is 46mm, and finishing temperature is 850 DEG C, and target thickness is 4mm, through ultrafast cold after rolling
Cold with ACC layer being cooled to target coiling temperature 600 DEG C, coil of strip batches rear air cooling.After steel roll temperature is less than 60 DEG C, can be by coil of strip
Carry out out at traverse flat, open plain plate and carry out 650 DEG C × 25min tempering one by one at wide flat steel heat-treatment lines.
The high-strength steel with yield strength of 700 MPa produced according to above method, steel plate flatness can ensure at below 2mm/m.
Steel plate is from top layer to center, and crystallite dimension is the most tiny, and size is highly uniform, and average grain size is 3-5 μm, microscopic structure class
Type is quasi-polygonal ferrite+a small amount of cementite.Described steel plate and hot rolling raw material plate thereof and other patent identical grade of steel product
Mechanical property compare and be shown in Table 1.
Table 1 example 1 mechanical property and the comparison with other steel
From table 1 it follows that this patent tempered steel is compared with other steel of same intensity rank, yield strength is the highest
Going out 75MPa, tensile strength at least exceeds 51MPa, and plasticity index is no worse than other steel.It addition, horizontal, longitudinal mechanical property difference
Less than its hot rolling raw steel, steel plate is respectively to performance evenly, more stable.
Embodiment 2
At slab caster, smelting in 210 tons of converters the molten steel through LF stove Yu RH stove refine are poured into strand, and it is changed
Learning composition quality percentage composition is: C 0.073, Si 0.26, Mn 1.82, P 0.012, S 0.0029, Als 0.029, Ca
0.0005, Nb 0.063, Ti 0.116, Mo 0.18, remaining is Fe and inevitable impurity.
Slab thickness is 230 mm, rolls at 2250 conventional hot continuous rolling machine production lines, and heating-up temperature is 1240 DEG C, finish rolling
Inlet temperature is 1030 DEG C, and workpiece thickness is 51mm, and finishing temperature is 850 DEG C, and target thickness is 6mm, through ultrafast cold after rolling
Cold with ACC layer being cooled to target coiling temperature 600 DEG C, coil of strip batches rear air cooling.After steel roll temperature is less than 60 DEG C, can be by coil of strip
Carry out out at traverse flat, open plain plate and carry out 650 DEG C × 25min tempering one by one at thin plate heat-treatment lines.
The high-strength steel with yield strength of 700 MPa produced according to above method, steel plate flatness can ensure at below 2mm/m.
Steel plate average grain size is 4-6 μm, and size is highly uniform, and microscopic structure type is quasi-polygonal ferrite+a small amount of cementite.
The mechanical property of described steel plate and hot rolling raw material plate and other patent identical grade of steel product compares and is shown in Table 2.
Table 2 example 2 mechanical property and the comparison with other steel
From Table 2, it can be seen that tempering steel plate is compared with other steel of same intensity rank, yield strength at least exceeds
45MPa, tensile strength at least exceeds 20MPa, and plasticity index and impact flexibility are no worse than other steel.It addition, horizontal, longitudinal performance
Its hot rolling raw steel of diversity ratio is little, and steel plate is respectively to performance evenly, more stable.
Embodiment 3
Smelting in 210 tons of converters the molten steel through LF stove Yu RH stove refine are poured into strand at slab caster, its matter
Amount percentage composition be: C 0.068, Si 0. 0.21, Mn 1.87, P 0.013, S 0.0022, Als 0.034, Ca 0.0008,
Nb 0.061, Ti 0.109, Mo 0.19, remaining is Fe and inevitable impurity.
Slab thickness is 230 mm, rolls at 2250 conventional hot continuous rolling machine production lines, and heating-up temperature is 1240 DEG C, finish rolling
Inlet temperature is 1030 DEG C, and workpiece thickness is 54mm, and finishing temperature is 840 DEG C, and target thickness is 8mm, through ultrafast cold after rolling
Cold with ACC layer being cooled to target coiling temperature 580 DEG C, coil of strip batches rear air cooling.After steel roll temperature is less than 60 DEG C, coil of strip is existed
Traverse carries out out flat, opens plain plate and carries out 650 DEG C × 30min tempering one by one at thin plate heat-treatment lines.
The high-strength steel with yield strength of 700 MPa produced according to above method, steel plate flatness can ensure at below 2mm/m.
Steel plate average grain size is 4-6 μm, and size is highly uniform, and microscopic structure type is quasi-polygonal ferrite+a small amount of cementite.
The mechanical property of described steel plate and hot rolling raw material plate and other patent identical grade of steel product compares and is shown in Table 3.
Table 3 example 3 mechanical property and the comparison with other steel
From table 3 it is observed that tempering steel plate is compared with other steel of same intensity rank, yield strength at least exceeds
77MPa, tensile strength at least exceeds 69MPa, and plasticity is suitable with other steel with toughness aggregative indicator.It addition, horizontal, longitudinal performance
Its hot rolling raw steel of diversity ratio is little, and steel plate is respectively to performance evenly, more stable.
Claims (1)
1. the production method of a steel for engineering machinery plate, it is characterised in that: steel plate chemical composition weight/mass percentage composition is C
0.05～0.09, Si 0.05～0.30, Mn 1.5～2.0, P≤0.025, S≤0.005, Nb 0～0.07, Ti 0.08～
0.15, Mo 0.10～0.30, Als 0.015～0.06, Ca 0.0010～0.0030, N≤0.006, surplus is Fe, steel plate
THICKNESS CONTROL is at 3.0mm～8.5mm；
(1) continuous casting steel billet uses hot-loading and hot-conveying technique, and charging temperature when slab enters heating furnace is more than 300 DEG C, heating of plate blank
Temperature is more than 1200 DEG C；
(2) hot rolling finishing temperature controls at 820～880 DEG C；
(3) use the cooling rate cooling rate more than 25 DEG C/s that strip steel is cooled down after rolling；
(4) oiler temperature control is at 560～640 DEG C；
(5) steel plate through open gentle crosscutting after, heat-treatment lines carry out 550～650 DEG C/10～50min tempering.
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| CN105838973A (en) * | 2016-03-28 | 2016-08-10 | 黄惠玲 | High-strength steel plate and preparation process thereof |
| CN106929759B (en) * | 2017-03-17 | 2019-04-23 | 唐山钢铁集团有限责任公司 | A kind of 800MPa grades of thin gauge hot rolled strip and its production method |
| CN107513662A (en) * | 2017-09-08 | 2017-12-26 | 河钢股份有限公司邯郸分公司 | Save the production method of cold forming high intensity steel S700MC low strengths |
| CN108486464A (en) * | 2018-03-30 | 2018-09-04 | 湖南华菱涟源钢铁有限公司 | Ferrite-based tempered steel plate with yield strength of 900MPa and production method thereof |
| CN111440991B (en) * | 2020-04-07 | 2021-10-08 | 湖南华菱涟源钢铁有限公司 | Hot rolled steel plate with yield strength of 800MPa and manufacturing method thereof |
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| JP5037415B2 (en) * | 2007-06-12 | 2012-09-26 | 新日本製鐵株式会社 | High Young's modulus steel plate excellent in hole expansibility and method for producing the same |
| JP5088021B2 (en) * | 2007-07-05 | 2012-12-05 | 新日本製鐵株式会社 | High-rigidity, high-strength cold-rolled steel sheet and manufacturing method thereof |
| JP5381900B2 (en) * | 2010-05-27 | 2014-01-08 | 新日鐵住金株式会社 | ERW steel pipe for brace having excellent buckling resistance and manufacturing method thereof |
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