CN105506507A - Economical low-yield-ratio structural steel and manufacturing method thereof - Google Patents
Economical low-yield-ratio structural steel and manufacturing method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 229910000746 Structural steel Inorganic materials 0.000 title abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 23
- 238000005096 rolling process Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000001953 recrystallisation Methods 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 3
- 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 claims description 3
- 239000004568 cement Substances 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 claims description 2
- 230000008025 crystallization Effects 0.000 claims description 2
- 239000010936 titanium Substances 0.000 description 13
- 239000011572 manganese Substances 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 239000010955 niobium Substances 0.000 description 11
- 238000003466 welding Methods 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910001566 austenite Inorganic materials 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000013078 crystal Substances 0.000 description 8
- 229910001563 bainite Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910008455 Si—Ca Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention discloses economical low-yield-ratio structural steel which is characterized by comprising the following chemical components in percentage by mass: c: 0.005-0.02%, Si: 0.30-0.50%, Mn: 1.50% -1.80%, Nb: 0.02-0.04%, Ti: 0.005-0.030%, Cr: 0.10% -0.30%, Ni: 0.10% -0.20%, Als: 0.010-0.070%, and the balance of Fe and inevitable impurities; the tensile strength of the steel plate is more than or equal to 600MPa, and the yield ratio is less than or equal to 0.75.
Description
Technical field
The invention belongs to metal material field, relate to a kind of low-alloy low yield strength ratio steel plate and manufacture method thereof, be specially the economical low yield strength ratio structure iron of more than tensile strength 600MPa and manufacture method thereof.
Background technology
The lightweight of steel construction piece that can be energy-conservation be unable to do without its high strength and high tenacity, and guarantee that the security requirement structural steel of the steel construction such as building, bridge when earthquake, fire and accident occur has work hardening capacity, yield tensile ratio is an important parameter of the work hardening capacity weighing steel.But along with the rising of grade of steel, the yield strength of structure iron and tensile strength all have raising in various degree, and yield strength improves faster, namely yield tensile ratio raises, and this just means that the amplitude of steel plate working hardening reduces relatively, thus the security of danger electrode structure steel.
US6056833 U.S. patents discloses a kind of thermomechanical controlled rolling high-strength low-yield ratio weather resisting steel, its chemical composition is by weight percentage: C:0.08 ~ 0.12%, Mn:0.80 ~ 1.35%, Si:0.30 ~ 0.65%, Mo:0.08 ~ 0.35%, V:0.06 ~ 0.14%, Cu:0.20 ~ 0.40%, Ni≤0.50%, Cr:0.30 ~ 0.70%, Nb≤0.04%, Ti≤0.02%, S≤0.01%, P≤0.02%, N:0.001 ~ 0.014%, and remaining is Fe and trace impurity.After controlled rolling and controlled cooling, the yield strength of this steel is 490MPa, yield tensile ratio≤0.85.US5449420 U.S. patents discloses " a kind of high-strength low-yield ratio steel ", and its chemical composition is by weight percentage: C:0.15 ~ 0.40%, Si:0.10 ~ 0.70%, Mn:1.0 ~ 2.7%, Cr:1.0 ~ 3.5%, Al
s0.01 ~ 0.05%, P≤0.025%, S≤0.015%, Mo:0 ~ 1.0%, Ni:0 ~ 2.5%, V:0 ~ 0.10%, Ti:0 ~ 0.10%, Nb:0 ~ 0.10%, B:0 ~ 0.0050%.Remaining is Fe and trace impurity.This patent controls the ratio of martensite or bainite in steel by controlling different composition proportion, thus effectively ensures yield tensile ratio≤0.75 of steel plate, but the carbon content of this steel grade is higher, be unfavorable for the welding property of steel plate, the content of Si is higher, and the degree of cleaning of steel decline, toughness reduces, and weldability is poor.In addition, above-mentioned two patents add price alloying element V costly, and production cost is high.
Application number is 2006100219038.7, Chinese patent and the application number of " manufacture method of low yield strength ultrafine grain belt steel " by name are 03133872.0, the Chinese patent of " a kind of manufacture method of low-yield-ratio fire resistant hot continuously-rolled strip for building " by name, though provide lower yield tensile ratio, but low strength, tensile strength is at 400 ~ 510MPa.
Application number be 200410096795.7 patent provide a kind of high tensile strength high toughness low yield ratio bainite steel and production method thereof, main chemical compositions content (Wt%) is: C0.015% ~ 0.08%, Si0.26% ~ 0.46%, Mn1.5% ~ 1.7%, Nb0.015% ~ 0.060%, Ti0.005% ~ 0.03%, B0.0005% ~ 0.003%, Mo0.2% ~ 0.5%, Cu0.4% ~ 0.6%, Ni0.26% ~ 0.40%, Al0.015% ~ 0.05%, and remaining is Fe and inevitable impurity.Adopt TMCP+RPC+SQ method to produce, can realize tensile strength is that the yield tensile ratio of 800MPa level steel plate reaches less than 0.85, substantially increases the low-temperature flexibility of steel plate simultaneously.Which are added a large amount of Mo, the noble elements such as Nb, increase cost, application number is 200410084699.0 provide a kind of low yield ratio easy welding structure steel plate and production method thereof, the weight percent of its chemical composition is as follows: C:0.01% ~ 0.10%, Si:1.00% ~ 1.50%, Mn:0.80% ~ 1.10%, P :≤0.020%, S :≤0.015%, Ni:0.30% ~ 3.20%, Al:0.02% ~ 0.03%, Ti:0.01% ~ 0.15%, B:0.0003% ~ 0.0010%, N:0.0020% ~ 0.0150%, surplus is iron and inevitable impurity.Although this patent has lower welding crack sensibility coefficient and yield tensile ratio, adopt a large amount of noble element Ni, cost increases.And above-mentioned binomial patent is only applicable to the production of the steel plate of more than tensile strength 700MPa rank, all with the addition of the B element of trace, and B is restive in smelting process, easy segregation, causes red brittleness, increases thermal pressure difficulty of processing.
At paper " test of a low yield strength ratio high-strength building refractory steel controlled rolling and controlled cooling " test steel listed in the text, composition: C:0.05 ~ 0.10, Si:0.3-0.6, Mn1.0 ~ 1.5, Cr0.4 ~ 0.6, Mo0.4 ~ 0.6, Ti0.01 ~ 0.02, although this article has similar yield tensile ratio, composition adopts noble metal Mo element, increase cost, be unfavorable for the improvement of low-temperature flexibility.In addition, C content is slightly high, is unfavorable for the improvement of welding property.
Summary of the invention
Technical problem to be solved by this invention is the above-mentioned various defect overcome existing for prior art, provides a kind of economical low yield strength ratio structure iron and manufacture method thereof, the tensile strength >=600MPa of this steel plate, yield tensile ratio≤0.75.
For achieving the above object, the present invention takes following technical scheme:
Economical low yield strength ratio structure iron, steel chemical composition of the present invention adopts low C, add the elements such as Mn, Cr with low cost, chemical composition (weight percent) is: C:0.005% ~ 0.02%, Si:0.30% ~ 0.50%, Mn:1.50% ~ 1.80%, Nb:0.02% ~ 0.04%, Ti:0.005% ~ 0.030%, Cr:0.10% ~ 0.30%, Ni:0.10% ~ 0.20%, Als:0.010% ~ 0.070%, and surplus is Fe and inevitable impurity.
Present component design reason:
C: carbon is very large on the intensity of steel, toughness and welding property, smelting cost impact.Carbon is lower than 0.005% needs vacuum metling, and carbon is higher than 0.02%, then make unit elongation and toughness decline, the scope of determination carbon content of the present invention is: 0.005% ~ 0.02%.
Mn: manganese is the effective element improving intensity and toughness, have larger promoter action, and cost is very cheap to bainite transformation.This constituent content reduces plasticity and the toughness of steel hardly increase hardness of steel in certain scope while.Mn reduces the transition temperature of γ-α, add the nucleation rate of α during phase transformation, refinement ferrite crystal grain; Mn can expand γ district, makes the thermoplasticity processing temperature range extension of steel, is conducive to the enforcement of controlled rolling technique, increases cold zone cumulative deformation and reduce finishing temperature to make the further refinement of ferrite crystal grain.Here it is in the world when designing the composition of steel many employings " low " carbon " height " manganese improve the reason of the intensity of steel.Therefore suitable interval Mn1.5% ~ 1.8% in the present invention.
Si: silicon is the bioelement of deoxidation in steel making, also can play solution strengthening effect, improve the intensity of steel, Si can also improve the corrosion resistance of steel, but Si content is too high, and the degree of cleaning of steel decline, and toughness reduces, and weldability is poor.The toughness of steel can be reduced, also unfavorable to welding property.In the present invention silicon is limited in the scope of 0.30% ~ 0.50%.
Nb: niobium is important Addition ofelements of the present invention.During heating, the carbon of undissolved Nb, nitride particles are distributed on austenite grain boundary, can hinder steel Austenite Grain Growth when heating; It can the austenitic recrystallize of delayed deformation effectively, and stop Austenite Grain Growth, improve austenite recrystallization temperature, crystal grain thinning, improves intensity and toughness simultaneously; It can improve the hardening capacity of steel, promotes bainite transformation; In the operation of rolling, the carbide of some niobium precipitates to hinder dynamic recrystallization further and the generation of Static Recrystallization after rolling in dislocation, subgrain boundary; Precipitate in γ-α phase transformation, form very tiny alloy carbide, play precipitation strength; Nb to yield strength and tensile strength especially very large to the raising effect of yield strength.In the present invention Nb content is limited in 0.02% ~ 0.04% scope.
Ti: the titanium adding trace in steel, being to make titanium, nitrogen form titanium nitride, stoping steel billet the growing up of crystal grain in heating, rolling, welding process, improving the toughness of mother metal and welded heat affecting zone.Titanium lower than 0.005% time, nitrogen fixation effect is poor, and during more than 0.03%, nitrogen fixation effect reaches capacity, and superfluous titanium will make the toughness deteriorate of steel.When the ratio of the Ti in steel, atom N is 1:1, the most tiny and distribution disperse of TiN particle, the strongest to the refining effect of high temperature austenite crystal grain, not only can obtain excellent toughness, and the Large Heat Input Welding of more than 30KJ/cm can be realized.Ratio now corresponding to Ti, N weight is 3.42, therefore in the present invention, in conjunction with N in steel content and be convenient to the needs of continuous casting, by titanium Composition Control 0.005% to 0.03%.Optimum control is the ratio of Ti, N weight is about 3.42.
Al: aluminium is deoxidant element, and can be combined with N and form the larger AlN of dispersity, thus decrease the free N existed mutually with gap, reduce the tough brittle transition temperature of steel, improve the low temperature impact properties of steel, effectively crystal grain thinning.When it is containing quantity not sufficient 0.010%, effect is less; During more than 0.070%, desoxydatoin reaches capacity; Highly more then mother metal and welding heat influence area toughness to be harmful to.So aluminium content controls 0.010% ~ 0.070% in the present invention.
Cr: add the atmospheric corrosion resistance that Cr element mainly ensures steel, promotes bainite transformation, contributes to the refinement of austenite crystal during rolling and the generation of fine bainite, improves tensile strength.Thus, in the present invention the interval of Cr content 0.10% ~ 0.30%.
Ni: nickel element does not have detrimentally affect to the welded heat affecting zone hardening of steel and toughness, and can improve the solidity to corrosion of steel, and the low-temperature flexibility of steel is improved greatly.Nickel is noble element, causes the cost of steel significantly to rise, less economical.Therefore in the present invention Ni content is controlled between 0.10% ~ 0.20%.
Impurity element in steel controls at P≤0.025%, S≤0.015%, to improve the toughness of steel.
Economical low yield strength ratio structure iron manufacture method, concrete production technique feature is as follows:
Smelting technology feature: carry out hot metal pretreatment, adopts converter smelting, by top blast or top bottom blowing, and dark as far as possible decarburization; Adopt VD, RH, LF etc. to carry out refining treatment, and carry out microalloying; Ca process, in conjunction with S content and tap in steel, feeds Si-Ca line, controls oxide morphology, improve ductility and toughness, reduce the horizontal and vertical poor performance of steel plate; Continuous casting adopts induction stirring, reduces element segregation; Rolling technology feature: the operation of rolling adopts TMCP technique; Rolling front billet heating temperature is 1040 DEG C ~ 1230 DEG C, the upper limit selects 1230 DEG C, can ensure to obtain tiny austenite crystal, and lower limit selects 1040 DEG C, the alloying element of a great deal of can be had to dissolve in austenite, be conducive to the formation of bainite in roller repairing process; Adopt two benches controlled rolling, Unhydrated cement deflection is greater than 50%, and recrystallize start rolling temperature controls, at >=1000 DEG C, not control 900 ~ 940 at crystallization start rolling temperature; Non-recrystallization finishing temperature control is at 840 ~ 880 DEG C.Roll rear accelerating cooling, speed of cooling of the present invention is 10 ~ 25 DEG C/s, and stopping cooling temperature is 300 DEG C ~ 500 DEG C, air cooling afterwards.Improve rate of cooling, thinning microstructure, be conducive to the intensity and the toughness that improve steel grade.
Beneficial effect of the present invention: steel grade the present invention of the present invention, using Mn, Cr element with low cost as main adding elements, does not contain Alloy Elements Mo, V, and adopt Ultra-low carbon content, welding property is good; Manufacturing process is simple, just can obtain high-strong toughness and low yield strength ratio without the need to the heat treatment process of complexity, both reduces production cost, and shortens the production cycle again; It is compared with same intensity rank prior art, and steel grade of the present invention has high strength (tensile strength >=600MPa), high tenacity (-40 DEG C of ballistic work >=120J) in guarantee, and yield tensile ratio is controlled to less than 0.75.
Embodiment
Be described in more detail the present invention by embodiment below, these embodiments are only the descriptions to best mode for carrying out the invention, do not have any restriction to scope of the present invention.
Its chemical composition designed according to this invention is as shown in table 1, its rolling technology and roll state mechanical property in table 2 and table 3.
The smelting Exemplary components of table 1, steel grade of the present invention, Wt%
| Embodiment | C | Si | Mn | Als | Ni | Cr | Ti | Nb |
| 1 | 0.005 | 0.30 | 1.70 | 0.01 | 0.12 | 0.30 | 0.008 | 0.04 |
| 2 | 0.01 | 0.50 | 1.60 | 0.034 | 0.10 | 0.25 | 0.005 | 0.031 |
| 3 | 0.02 | 0.30 | 1.57 | 0.032 | 0.18 | 0.23 | 0.030 | 0.038 |
| 4 | 0.01 | 0.28 | 1.69 | 0.03 | 0.20 | 0.10 | 0.019 | 0.03 |
| 5 | 0.02 | 0.43 | 1.78 | 0.01 | 0.16 | 0.25 | 0.01 | 0.02 |
The rolling technology of table 2, steel of the present invention
Table 3, steel of the present invention roll state mechanical property
Claims (2)
1. an economical low yield strength ratio structure iron, it is characterized in that chemical composition is by percentage to the quality: C:0.005% ~ 0.02%, Si:0.30% ~ 0.50%, Mn:1.50% ~ 1.80%, Nb:0.02% ~ 0.04%, Ti:0.005% ~ 0.030%, Cr:0.10% ~ 0.30%, Ni:0.10% ~ 0.20%, Als:0.010% ~ 0.070%, surplus is Fe and inevitable impurity; Tensile strength >=the 600MPa of steel plate, yield tensile ratio≤0.75.
2. an economical low yield strength ratio structure iron manufacture method according to claim 1, comprise the following steps: smelting, continuous casting, rolling and cooling, it is characterized in that the operation of rolling adopts TMCP technique, rolling front billet heating temperature is 1040 DEG C ~ 1230 DEG C, adopt two benches controlled rolling, Unhydrated cement deflection is greater than 50%, and recrystallize start rolling temperature controls at >=1000 DEG C, does not control at 900 ~ 940 DEG C at crystallization start rolling temperature; Non-recrystallization finishing temperature control is at 840 ~ 880 DEG C; Roll rear accelerating cooling, speed of cooling is 10 ~ 25 DEG C/s, and stopping cooling temperature is 300 DEG C ~ 500 DEG C, air cooling afterwards.
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Citations (7)
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|---|---|---|---|---|
| JPH06279852A (en) * | 1993-03-29 | 1994-10-04 | Nippon Steel Corp | Production of low yield ratio high tensile strength steel |
| JP2003213333A (en) * | 2002-01-25 | 2003-07-30 | Jfe Engineering Kk | Method of producing low yield ratio and high tensile strength steel having reduced difference in material in sheet thickness direction |
| JP2006336065A (en) * | 2005-06-01 | 2006-12-14 | Nippon Steel Corp | Low yield-ratio high tensile-strength steel, and method for producing low yield-ratio high tensile-strength steel |
| JP2007031796A (en) * | 2005-07-28 | 2007-02-08 | Kobe Steel Ltd | Low-yield-ratio high-tensile-strength steel sheet |
| CN101619423A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | High-strength-toughness low-yield-ratio easy-welding structural steel plate and manufacturing method thereof |
| CN102011068A (en) * | 2010-12-13 | 2011-04-13 | 首钢总公司 | 800 MPa-grade low-yield-ratio structural steel plate and production method thereof |
| CN103422025A (en) * | 2013-09-13 | 2013-12-04 | 武汉钢铁(集团)公司 | Steel for low-yield-ratio structure with yield strength larger than or equal to 690MPa and production method of steel |
-
2014
- 2014-09-26 CN CN201410503621.1A patent/CN105506507A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06279852A (en) * | 1993-03-29 | 1994-10-04 | Nippon Steel Corp | Production of low yield ratio high tensile strength steel |
| JP2003213333A (en) * | 2002-01-25 | 2003-07-30 | Jfe Engineering Kk | Method of producing low yield ratio and high tensile strength steel having reduced difference in material in sheet thickness direction |
| JP2006336065A (en) * | 2005-06-01 | 2006-12-14 | Nippon Steel Corp | Low yield-ratio high tensile-strength steel, and method for producing low yield-ratio high tensile-strength steel |
| JP2007031796A (en) * | 2005-07-28 | 2007-02-08 | Kobe Steel Ltd | Low-yield-ratio high-tensile-strength steel sheet |
| CN101619423A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | High-strength-toughness low-yield-ratio easy-welding structural steel plate and manufacturing method thereof |
| CN102011068A (en) * | 2010-12-13 | 2011-04-13 | 首钢总公司 | 800 MPa-grade low-yield-ratio structural steel plate and production method thereof |
| CN103422025A (en) * | 2013-09-13 | 2013-12-04 | 武汉钢铁(集团)公司 | Steel for low-yield-ratio structure with yield strength larger than or equal to 690MPa and production method of steel |
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