CN102851615A - Tensile strength 800 MPa grade structure steel plate with low yield ratio and manufacture method thereof - Google Patents
Tensile strength 800 MPa grade structure steel plate with low yield ratio and manufacture method thereof Download PDFInfo
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Abstract
The invention discloses tensile strength 800 MPa grade structure steel plate with low yield ratio and manufacture method thereof. The steel plate comprises 0.02%-0.08% of C, 0.30-0.50% of Si, 1.50-1.80% of Mn, 0.02-0.04% of Nb, 0.005-0.030% of Ti, 0.010-0.19% of Mo, 0.30-0.45% of Cr, 0.10-0.29% of Cu, 0.10-0.40% of Ni, 0.010-0.070% of Als, and Fe in balance. The method includes smelting, continuous casting and rolling; wherein steel blank temperature before rolling is 1,040-1,230 DEG C, recrystallization zone rolling temperature is greater than or equal to 1,000 DEG C, non-recrystallization zone rolling temperature is 950 DEG C-(Ar 3+0-100 DEG C), accumulated deformation amount is greater than 50%, cooling speed after rolling is 30-60 DEG C/s, and final cooling temperature is 100-300 DEG C. The invention has low cost, good welding property, high strength, high toughness, low yield ratio, simple manufacture process, and no complex thermal processing.
Description
Technical field
The invention belongs to the metallic substance technical field, relate in particular to a kind of low-alloy low yield strength ratio steel plate 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 to build, the security requirement structural steel of steel construction when earthquake, fire and accident occur such as bridge have work hardening capacity, yield tensile ratio is to weigh an important parameter of the work hardening capacity of 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, be that yield tensile ratio raises, this amplitude that just means the steel plate working hardening reduces relatively, thus the security of steel of danger electrode structure.
The patent No. is that the United States Patent (USP) of US6056833 discloses a kind of heat engine tool 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%, remaining is Fe and trace impurity.The yield strength of this steel is 490MPa behind the controlled rolling and controlled cooling, yield tensile ratio≤0.85.The patent No. is that the United States Patent (USP) of US5449420 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%, AlS 0.01～0.05%, 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 is controlled the ratio of martensite in the steel or bainite by controlling different composition proportion, thereby effectively guarantees the yield tensile ratio of steel plate≤0.75, but the carbon content of this steel grade is higher, the welding property that is unfavorable for steel plate, the content of Si is higher, and the degree of cleaning of steel descend, toughness drop, weldability is poor.In addition, above-mentioned two patents have all added the expensive alloying element V of price, 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 lower yield tensile ratio is provided, but low strength, tensile strength is at 400～510MPa.
Application number provides a kind of high tensile strength high toughness low yield ratio bainite steel and production method thereof for 200410096795.7 Chinese patent, main chemical compositions content (Wt%) is: C 0.015%～0.08%, Si 0.26%～0.46%, Mn 1.5%～1.7%, Nb 0.015%～0.060%, Ti 0.005%～0.03%, B 0.0005%～0.003%, Mo 0.2%～0.5%, Cu 0.4%～0.6%, Ni 0.26%～0.40%, Al 0.015%～0.05% remainingly are Fe and inevitable impurity.Adopt the TMCP+RPC+SQ method to produce, can realize that tensile strength is that the yield tensile ratio of 800MPa level steel plate reaches below 0.85, has improved the low-temperature flexibility of steel plate simultaneously greatly.It has added the noble elements such as a large amount of Mo, Nb, increases cost.Application number provides a kind of low yield ratio easy welding structure steel plate and production method thereof for 200410084699.0 Chinese patent, 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 above steel plate of tensile strength 700MPa rank, all added again micro-B element, and B is restive in smelting process, and easily segregation causes red brittleness, increases the thermal pressure difficulty of processing.
Summary of the invention
The object of the invention is to overcome the deficiency that above-mentioned prior art exists, provide that a kind of cost is low, production technique simple, structural steel and iron and the manufacture method thereof of tensile strength 800MPa rank, yield tensile ratio≤0.85.
The chemical composition of tensile strength 800MPa rank low yield strength ratio structural steel and iron of the present invention is take low C as essential characteristic, with Mn with low cost, the elements such as Cr are as main adding elements, its chemical composition (weight percent) is: C:0.02%～0.08%, Si:0.30%～0.50%, Mn:1.50%～1.80%, Nb:0.02%～0.04%, Ti:0.005%～0.030%, Mo:0.010%～0.19%, Cr:0.30%～0.45%, Cu:0.10%～0.29%, Ni:0.10%～0.40%, Als:0.010%～0.070%, P≤0.025%, S≤0.015%, surplus are Fe and inevitable impurity.
Composition Design reason of the present invention:
C: carbon is very large on intensity, toughness and welding property, the smelting cost impact of steel.Carbon is lower than 0.02% needs vacuum metling, and carbon is higher than 0.08%, and unit elongation and toughness are descended, and the present invention determines that the scope of carbon content is: 0.02%～0.08%.
Mn: manganese is the effective element that improves intensity and toughness, bainite transformation is had larger promoter action, and cost is very cheap.This constituent content increases plasticity and the toughness that reduces hardly steel in the hardness of steel in certain scope.Mn has reduced the transition temperature of γ-α, the nucleation rate of α when having increased phase transformation, refinement ferrite crystal grain; Mn can enlarge the γ district, makes the thermoplasticity processing temperature range extension of steel, is conducive to the enforcement of controlled rolling technique, increases the cold zone cumulative deformation and reduce finishing temperature to make the further refinement of ferrite crystal grain.Here it is adopts " low " carbon " height " manganese to improve the reason of the intensity of steel when the composition of design steel in the world.Therefore suitable interval Mn 1.5%～1.8% in the present invention.
Si: silicon is the bioelement of deoxidation in steel making, also can play solution strengthening effect, improves the intensity of steel, and Si can also improve the corrosion resistance of steel, but Si content is too high, and the degree of cleaning of steel descend, toughness drop, and weldability is poor.Can reduce the toughness of steel, also unfavorable to welding property.In the present invention silicon is limited in 0.30%～0.50% the scope.
Nb: niobium is important interpolation element of the present invention.The carbon of undissolved Nb, nitride particles are distributed on the austenite grain boundary during heating, can hinder steel Austenite Grain Growth when heating; It is the austenitic recrystallize of delayed deformation effectively, stops Austenite Grain Growth, improves austenite recrystallization temperature, and crystal grain thinning improves intensity and toughness simultaneously; It can improve the hardening capacity of steel, promotes bainite transformation; The carbide of some niobium is in the generation of dislocation, subgrain boundary precipitation Static Recrystallization with further obstruction dynamic recrystallization with after rolling in the operation of rolling; In γ-α phase transformation, precipitate, form very tiny alloy carbide, play precipitation strength; Especially the raising effect to yield strength is very large to yield strength and tensile strength for Nb.In the present invention Nb content is limited in 0.02%～0.04% scope.
Ti: adding the titanium of trace in the steel, is in order to make titanium, nitrogen form titanium nitride, stops steel billet the growing up of crystal grain in heating, rolling, welding process, improves the toughness of mother metal and welded heat affecting zone.When titanium was lower than 0.005%, nitrogen fixation effect was poor, and when surpassing 0.03%, nitrogen fixation effect reaches capacity, and superfluous titanium will make the toughness of steel worsen.When the ratio of the Ti in the steel, N atom 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 good toughness can be obtained, and the Large Heat Input Welding that 30KJ/cm is above can be realized.Be 3.42 corresponding to the ratio of Ti, N weight this moment, therefore in the present invention, in conjunction with the content of N in the steel and the needs of being convenient to continuous casting, with the titanium Composition Control 0.005% to 0.03%.Optimum control is that 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, thereby has reduced the free N that exists mutually with the gap, reduces the tough brittle transition temperature of steel, improves the low temperature impact properties of steel, effectively crystal grain thinning.When it contained quantity not sufficient 0.010%, effect was less; When surpassing 0.070%, desoxydatoin reaches capacity; High then harmful to mother metal and welding heat influence area toughness again.So aluminium content is controlled at 0.010%～0.070% among the present invention.
Cr: adding the Cr element mainly is the atmospheric corrosion resistance that guarantees steel, promotes bainite transformation, helps the refinement of austenite crystal when rolling and the generation of fine bainite, improves tensile strength.Thereby the interval of Cr content is 0.30%～0.45% in the present invention.
Cu: copper does not only have detrimentally affect to welded heat affecting zone hardening and toughness, the intensity of mother metal is improved, and low-temperature flexibility is improved greatly, also can improve solidity to corrosion.In bainitic steel, add copper, can further improve the hardening capacity of steel, promote the formation of bainite, further make matrix strengthening; But easily crack when heating steel billet or hot rolling when Cu content is high, worsen the surface of steel plate performance, must add an amount of Ni to stop the generation of this crackle.In the present invention with copper content control between 0.10%～0.29%.
Ni: nickel element does not have detrimentally affect to welded heat affecting zone hardening and the toughness of steel, 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, and is less economical.The purpose of adding in the present invention the Ni element mainly is to stop to contain the tendency that the high steel billet of Cu amount cracks when heating or hot rolling.In order to reduce the hot-short phenomenon of Cu, therefore in the present invention Ni content is controlled between 0.10%～0.40%.
Mo: suppress the formation of proeutectoid ferrite, promote bainite transformation.Molybdenum can increase the nucleation site of carbide in steel, make the carbide of formation more tiny, more, thereby improves the yield strength of steel plate.The massfraction of molybdenum increases, and postpones the effect enhancing that proeutectoid ferrite changes, strength increase.But Mo is noble element, causes the cost of steel significantly to rise, and is less economical.In the present invention Mo content is controlled between 0.010%～0.19%.
Impurity element in the steel is controlled at P≤0.025%, and S≤0.015% is to improve the toughness of steel.
The production technique of steel of the present invention is as follows:
Smelting, continuous casting process: carry out hot metal pretreatment, adopt converter smelting, by top blast or top bottom blowing, dark as far as possible decarburization; Adopt VD, RH, LF etc. to carry out refining treatment, and carry out microalloying; Ca processes, and in conjunction with S content and tap in the steel, feeds the Si-Ca line, and the control oxide morphology improves ductility and toughness, reduces the horizontal and vertical poor performance of steel plate; Continuous casting adopts induction stirring, to reduce element segregation.
Rolling technology: (operation of rolling adopts TMCP technique)
Rolling front billet heating temperature is 1040～1230 ℃, and the upper limit is selected 1230 ℃, can guarantee to obtain tiny austenite crystal, and lower limit is selected 1040 ℃, in order to can there be the alloying element of a great deal of to dissolve in austenite, is conducive to roll the formation of bainite in the rear process of cooling;
Adopt the controlled rolling of two stages, the recrystallization zone rolling temperature is controlled at 〉=1000 ℃, non-recrystallization district rolling temperature be controlled at 950 ℃～(Ar3+0 ℃～100 ℃), the accumulation of distortion amount is greater than 50%;
Roll rear acceleration cooling, speed of cooling of the present invention is 30～60 ℃/s, and stopping cooling temperature is 100～300 ℃, afterwards air cooling.Improve rate of cooling, thinning microstructure is conducive to improve intensity and the toughness of steel grade.
Steel grade of the present invention as main adding elements, does not contain V and B with Mn with low cost, Cr, Cu element, adopts low carbon content, and welding property is good; Manufacturing process of the present invention is simple, need not complicated heat treatment step, and is with short production cycle, cost is low; Steel grade of the present invention not only has high strength (tensile strength 〉=800MPa), high tenacity (40 ℃ of ballistic works 〉=120J), also have lower yield tensile ratio (≤0.85).
Embodiment
The present invention is further illustrated below by embodiment.
The chemical composition of embodiment of the invention steel sees Table 1, and its rolling technology sees Table 2, rolls the attitude mechanical property and sees Table 3.
The smelting composition (Wt%) of table 1 embodiment of the invention steel
| Embodiment | C | Si | Mn | S | P | Als | Ni | Cr | Cu | Mo | Ti | Nb |
| 1 | 0.02 | 0.30 | 1.70 | 0.008 | 0.021 | 0.01 | 0.24 | 0.30 | 0.28 | 0.19 | 0.008 | 0.04 |
| 2 | 0.05 | 0.50 | 1.60 | 0.010 | 0.018 | 0.034 | 0.10 | 0.33 | 0.23 | 0.11 | 0.005 | 0.031 |
| 3 | 0.07 | 0.30 | 1.57 | 0.007 | 0.010 | 0.032 | 0.30 | 0.43 | 0.15 | 0.14 | 0.030 | 0.038 |
| 4 | 0.03 | 0.28 | 1.69 | 0.004 | 0.014 | 0.03 | 0.40 | 0.40 | 0.27 | 0.080 | 0.019 | 0.03 |
| 5 | 0.08 | 0.43 | 1.78 | 0.009 | 0.025 | 0.01 | 0.40 | 0.45 | 0.10 | 0.010 | 0.01 | 0.02 |
The rolling technology of table 2 embodiment of the invention steel
Table 3, embodiment of the invention steel roll the attitude mechanical property
Claims (2)
1. tensile strength 800MPa rank low yield strength ratio structural steel and iron, the chemical component weight per-cent that it is characterized in that steel is: C:0.02%～0.08%, Si:0.30%～0.50%, Mn:1.50%～1.80%, Nb:0.02%～0.04%, Ti:0.005%～0.030%, Mo:0.010%～0.19%, Cr:0.30%～0.45%, Cu:0.10%～0.29%, Ni:0.10%～0.40%, Als:0.010%～0.070%, P≤0.025%, S≤0.015%, surplus are Fe and inevitable impurity.
2. the manufacture method of the described tensile strength 800MPa rank of claim 1 a low yield strength ratio structural steel and iron comprises smelting, continuous casting and rolling, and it is characterized in that rolling front billet heating temperature is 1040～1230 ℃; Recrystallization zone rolling temperature 〉=1000 ℃; 950 ℃ of non-recrystallization district rolling temperatures～(Ar3+0 ℃～100 ℃), the accumulation of distortion amount is greater than 50%; Roll rear acceleration cooling, speed of cooling is 30～60 ℃/s, stops 100～300 ℃ of cooling temperatures, afterwards air cooling.
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Cited By (9)
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| 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 |
| CN103898405A (en) * | 2014-03-20 | 2014-07-02 | 济钢集团有限公司 | 780Mpa-grade molybdenum-boron high-strength structural steel plate and manufacturing method thereof |
| CN103981459A (en) * | 2014-05-30 | 2014-08-13 | 武汉钢铁(集团)公司 | High-strength refractory anti-seismic structure steel and production method thereof |
| CN106811704A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | Yield strength 500MPa grades of low yield strength ratio bridge steel and its manufacture method |
| CN107442568A (en) * | 2017-07-30 | 2017-12-08 | 湖南华菱湘潭钢铁有限公司 | A kind of milling method of big wall thickness pipe line steel |
| CN110863139A (en) * | 2019-10-31 | 2020-03-06 | 鞍钢股份有限公司 | Ultralow-temperature-impact-resistant 420 MPa-grade weather-resistant bridge steel and production method thereof |
| CN112647019A (en) * | 2020-12-10 | 2021-04-13 | 安阳钢铁股份有限公司 | Manufacturing method of steel with different strength grades and low yield ratio |
| CN113355600A (en) * | 2021-05-30 | 2021-09-07 | 五矿营口中板有限责任公司 | Super-thick steel plate for online quenching 800 MPa-grade engineering machinery and manufacturing method thereof |
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| 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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| CN103981459A (en) * | 2014-05-30 | 2014-08-13 | 武汉钢铁(集团)公司 | High-strength refractory anti-seismic structure steel and production method thereof |
| CN103981459B (en) * | 2014-05-30 | 2016-03-16 | 武汉钢铁(集团)公司 | A kind of high-strength fireproof anti-seismic structure steel and production method |
| CN106811704A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | Yield strength 500MPa grades of low yield strength ratio bridge steel and its manufacture method |
| CN107442568A (en) * | 2017-07-30 | 2017-12-08 | 湖南华菱湘潭钢铁有限公司 | A kind of milling method of big wall thickness pipe line steel |
| CN110863139A (en) * | 2019-10-31 | 2020-03-06 | 鞍钢股份有限公司 | Ultralow-temperature-impact-resistant 420 MPa-grade weather-resistant bridge steel and production method thereof |
| CN112647019A (en) * | 2020-12-10 | 2021-04-13 | 安阳钢铁股份有限公司 | Manufacturing method of steel with different strength grades and low yield ratio |
| CN113355600A (en) * | 2021-05-30 | 2021-09-07 | 五矿营口中板有限责任公司 | Super-thick steel plate for online quenching 800 MPa-grade engineering machinery and manufacturing method thereof |
| CN113355600B (en) * | 2021-05-30 | 2022-10-25 | 日钢营口中板有限公司 | Super-thick steel plate for online quenching 800 MPa-grade engineering machinery and manufacturing method thereof |
| WO2024016419A1 (en) * | 2022-07-22 | 2024-01-25 | 南京钢铁股份有限公司 | Low-yield-ratio weather-resistant bridge steel and manufacturing method |
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Application publication date: 20130102 |