CN103952627B - A kind of high-elongation low yield strength ratio ferrite weathering steel and production method - Google Patents
A kind of high-elongation low yield strength ratio ferrite weathering steel and production method Download PDFInfo
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Abstract
A kind of high-elongation low yield strength ratio ferrite weathering steel, its component and weight percent content: C:0.0008 ~ 0.0030%, Si:0.03 ~ 0.09%, Mn:0.09 ~ 0.25%, P :≤0.008%, S :≤0.002%, Nb:0.010 ~ 0.040%, Ti:0.010 ~ 0.050%, N :≤0.0045%, Ca:0.0010 ~ 0.0030%, Mg:0.0010 ~ 0.0040%, RE:0.006 ~ 0.016%, O :≤0.0018%, it is single ferritic structure under steel plate room temperature；Production stage: desulfurizing iron converter smelting；Application of vacuum；Strand is heated；Segmentation rolls；Air cooling is to room temperature stand-by.The present invention has elongation percentage A50mm≥70%；Yield tensile ratio≤0.70；It is single ferritic structure under steel plate room temperature, so that the anti-seismic performance of steel construction is further enhanced, makes building safety the most preferably ensure.
Description
Technical field
The present invention relates to a kind of construction(al)steel and production method thereof, particularly belong to a kind of high-elongation low yield strength ratio ferrite weathering steel and production method.
Background technology
Along with the development of steel building cause, the anti-seismic performance improving steel construction becomes one of requisite measure ensureing building safety.In steel building Aseismic Design, can be designed by structure or constructional device (such as damper) is plastically deformed and absorbs the energy that earthquake produces, this just requires that Constructional Steel has preferable plastic deformation ability, good percentage elongation, relatively low yield tensile ratio.Use the excellent steel of weather resistance simultaneously, steel construction, device can be made to reduce or exempt because of application, safeguard the expensive expense caused, reducing the potential safety hazard that structure is caused because of corrosion by steel.
Through retrieval, Chinese Patent Application No. is the document of 200510120586.6, discloses a kind of cold rolling weather resisting deep drawing automobile sheet and preparation method thereof.Its Main Components and percentage by weight thereof be: C:0.002～0.012%, Si :≤0.025%, Mn≤0.10%, P:0.011～0.049%, S :≤0.015%, Als:0.01～0.05%, Cr:0.15～0.35%, Cu:0.03～0.30%, Ni:0.03～0.30%, remaining is iron and inevitable impurity, and its component and weight percent content also should meet three below formula: Cu+Cr+Ni≤0.6%, crack sensitivity=C+Mn/20+Si/30+Ni/60+Cu/20+Cr/20≤0.08%, carbon equivalent Ceq=C+Mn/6+ (Cu+Ni)/15+Cr/5≤0.08%.This invention steel is vehicle structure plate, belongs to cold-rolled steel field, is not suitable for being applied to building structure cut deal field, and Plate Production need to through rolling, batching, pickling, the technique such as cold rolling, annealing, flow process is longer, relatively costly.Additionally, containing more Cu, Cr, Ni element in this invention steel.
Chinese Patent Application No. is the document of 200610134087.7, disclose a kind of high-performance low-carbon bainite construction steel, its chemical composition is: C:0.04～0.07%, Si:0.20～0.50%, Mn:1.50～1.80%, Nb:0.03～0.06%, Ti:0.005～0.030%, Cr:0.25～0.50%, Cu:0.30～0.60%, Ni:0.20～0.50%, Als:0.010～0.070%, and surplus is Fe and inevitable impurity.Its operation of rolling uses TMCP+RPC technique, rolling front heating-up temperature is 1050～1220 DEG C, use two benches controlled rolling, recrystallization zone rolling temperature controls at >=1000 DEG C, and Unhydrated cement rolling temperature controls at 950 DEG C～(Ar3+0～100 DEG C), and Unhydrated cement rolling accumulation of distortion amount is more than 50%, roll rear relaxation 10～120s, accelerating cooling subsequently, terminating chilling temperature is 380～530 DEG C, air cooling afterwards.Being bainite structure under this invention steel room temperature, its elongation percentage is mutually relatively low, and only about 25%；Yield tensile ratio is higher, and about 0.74 ~ 0.86；Containing more Cu, Cr, Ni element in steel.
The deficiency that above-mentioned patent document exists:
1) containing more Cu, Cr, Ni element, cost of alloy is higher；
2) steel plate elongation percentage is relatively low, and yield tensile ratio is of a relatively high.
Summary of the invention
Present invention aim at solving the deficiency that prior art exists, it is provided that one has elongation percentage A50mm≥70%；Yield tensile ratio≤0.70；It is high-elongation low yield strength ratio ferrite weathering steel and the production method of single ferritic structure under steel plate room temperature.
A kind of high-elongation low yield strength ratio ferrite weathering steel, its component and weight percent content: C:0.0008 ~ 0.0030%, Si:0.03 ~ 0.09%, Mn:0.09 ~ 0.25%, P :≤0.008%, S :≤0.002%, Nb:0.010 ~ 0.040%, Ti:0.010 ~ 0.050%, N :≤0.0045%, Ca:0.0010 ~ 0.0030%, Mg:0.0010 ~ 0.0040%, RE:0.006 ~ 0.016%, O :≤0.0018 %, remaining for Fe and is inevitably mingled with；Mechanical property: elongation percentage A50mm≥70%；Yield tensile ratio≤0.70；It it is single ferritic structure under steel plate room temperature.
It is characterized in that: be added with Sn:0.07 ~ 0.13% or Sb:0.06 ~ 0.09% or Zn:0.06 ~ 0.11% or compound interpolation.
Produce a kind of high-elongation low yield strength ratio ferrite weathering steel, its step:
1) carry out desulfurizing iron converter smelting, control C:0.0008 ~ 0.0030% in molten steel, P≤0.008%, S≤0.002%；
2) in RH stove, carry out application of vacuum: in processing procedure add Mg, Ca element, and make Ca 0.0010 ~ 0.0030%, Mg 0.0010 ~ 0.0040%, O≤0.0018 %；
3) strand is heated, control heating-up temperature at 1240～1290 DEG C；
4) carry out segmentation rolling, control roughing end temp and be not less than 1000 DEG C；Control finish rolling finishing temperature, at 880～970 DEG C, controls finish rolling every time reduction ratio of finish to gauge previous three passes and is not less than 6%, and last three passages add up reduction ratio and are not less than 30%；
5) air cooling is to room temperature stand-by.
It is as follows that steel main chemical compositions of the present invention limits reason:
C is to improve the maximally effective element of steel strength, the tensile strength increasing steel of carbon content and yield strength improve therewith, but elongation percentage declines, and corrosion resistance also can decline, and the welding heat affected zone of steel there is also phenomenon of hardening, cause the generation of welding cold cracking.Steel of the present invention is to ensure that steel plate obtains good elongation percentage and decay resistance and obtains ferritic structure single under room temperature, and carbon element content is designed as 0.0008 ~ 0.0030%.
Si can improve the decay resistance of steel, often it is added in stainless steel, low-alloy steel, corrosion resistant alloy, to improve the corrosion resistance of these alloys, them are made to have the performances such as resistance to chloride stress-corrosion cracking, resistance to spot corrosion, resistance to anti-oxidant, the seawater corrosion resistance of hot concentrated burn into.Research shows, in damp and hot atmospheric environment, Si can be obviously improved the atmospheric corrosion resistance of carbon steel and low alloy steel, additionally, Si can also improve the corrosion resistance of low-alloy steel splash zone in the seawater, but too much Si content can cause welding performance to decline, therefore combining mechanical property requirements, it is 0.03 ~ 0.09% that the Si content of steel of the present invention controls.
Mn is important Strengthening and Toughening element, and along with the increase of Mn content, the intensity of steel substantially increases, and impact transition temperature changes hardly.Mn containing 1% about can improve tensile strength 100MPa, and too much Mn can cause steel grade toughness to decline.Meanwhile, Mn slightly improves the effect of atmospheric corrosion resistance of steel.The comprehensive mechanics of steel, decay resistance, Mn content is designed as 0.09 ~ 0.25% by steel of the present invention.
P, S are the impurity elements in steel.P has the corrosion resistance effect that improves, but P is a kind of element being prone to segregation, produces macrosegregation in the local of steel, reduces plasticity and toughness, highly unwanted to low-temperature flexibility.S element is prone to segregation and enrichment in steel, is the element to decay resistance evil.The present invention strictly controls P≤0.008%, and S≤0.002%, to meet the requirement of degree of purity and decay resistance.
Nb, Ti are two kinds of strong carbide and nitride forming element, add appropriate Nb, Ti element in steel, make the C in steel, atom N be fixed to carbide, nitride, present gap-free atom state.But should not add the Ti element of excess in steel, more Ti can make the roughening of its carbonitride particle thus lose Grain boundary pinning effect.Additionally, a certain amount of Nb, Ti also can play the effect improving steel grade toughness.Nb, Ti element wt percentage composition is controlled as Nb:0.010 ~ 0.040%, Ti:0.010 ~ 0.050% by the present invention.
Ca, Mg have desulfurization, deoxidation, minimizing inclusion distribution in steel and change the effect of field trash shape, and the Al deoxidization steel processed through Ca, Mg can reduce field trash number in steel inclusion sum and unit are, controls molten steel total oxygen content simultaneously.Additionally, Ca, Mg dissolve can improve pH value, it is possible to the pH value that the hydrolysis on local anode that suppression causes because of dissolved ferric iron causes reduces, and i.e. suppresses corrosion reaction, improves corrosion resistance.If but Ca, Mg are excessive, may result in processability and weldability reduces, steel Ca, Mg content of the present invention controls as Ca:0.0010 ~ 0.0030%, Mg:0.0010 ~ 0.0040%, O :≤0.0018 %.
Sn, Sb element can improve the resistance to general corrosion performance under dry and wet environment repeatedly, and improves acid-resistant corrosion, and excess then may result in steel plate serviceability and reduces.Additionally, also have the effect improving corrosion resistance under seawater spittle environment when pH value reduces.Its content is respectively chosen as Sn:0.07 ~ 0.13%, Sb:0.06 ~ 0.09% by the present invention.
Matrix can be cut off with the moisture in environment by forming diaphragm on steel surface with salinity or reaction of Salmon-Saxl, thus reach the effect of suppression corrosion by Zn.Zn content of the present invention is chosen as 0.06 ~ 0.11%.
RE rare earth element can improve the antioxygenic property of steel, reduces intergranular oxidation.Steel adds RE, it is possible to decrease the S content of rusty scale, promote that Si, Cu and P are at the enrichment of interior rusty scale and Fe2O3·H2The generation of O, advantageously forms the compound iron rusty scale that finer and close adhesiveness is good, thus is greatly improved the atmospheric corrosion resistance of steel plate.Meanwhile, RE and oxygen, sulphur have the strongest affinity, have purification and obvious metamorphism in steel.The RE being solid-solubilized in steel can be enriched in crystal boundary by flooding mechanism, reduces the tramp element segregation at crystal boundary, and result enhances crystal boundary, improves the performance relevant to crystal boundary, such as black brittleness, toughness etc..RE addition of the present invention is 0.006 ~ 0.016%.
Process control features is:
Through Deep Desulphurization of Hot Metal, converter top and bottom blowing, after application of vacuum, sufficiently lower P, S element and inclusion morphology, quantity, distribution, reach to suppress corrosion reaction to improve corrosion proof effect.After continuous casting, by billet heating temperature 1240 ~ 1290 DEG C, the rough rolling step start rolling temperature of steel is more than 1000 DEG C, and control finish rolling finishing temperature, at 840～970 DEG C, controls every time reduction ratio of previous three passes and is not less than 6%, and last three passages add up reduction ratio >=30%.Air cooling after finish to gauge.By above-mentioned technique, guaranteeing that steel plate obtains completely on the basis of ferritic structure, making steel plate have good elongation percentage and relatively low yield tensile ratio.
The steel of the present invention has the advantage that
1) high (A of steel plate elongation percentage50mm>=70%), anti-seismic performance good (yield tensile ratio≤0.70), and decay resistance is better than CortenB.
2) by S content (S≤0.002%) is controlled, utilize Ca, Mg deoxidation and control steel inclusion quantity, form, reaching to suppress corrosion reaction to improve corrosion proof effect.
Detailed description of the invention
The invention will be further described below:
Table 1 is various embodiments of the present invention and the chemical constituent of comparative example and weight percentage list；
Table 2 is the main technologic parameters value list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and the elongation percentage of comparative example, yield tensile ratio, weathering performance test results list.
Various embodiments of the present invention are carried out according to following processing step:
1) carry out desulfurizing iron converter smelting, control C:0.0008 ~ 0.0030% in molten steel, P≤0.008%, S≤0.002%；
2) in RH stove, carry out application of vacuum: in processing procedure add Mg, Ca element, and make Ca 0.0010 ~ 0.0030%, Mg 0.0010 ~ 0.0040%, O≤0.0018 %；
3) strand is heated, control heating-up temperature at 1240～1290 DEG C；
4) carry out segmentation rolling, control roughing end temp and be not less than 1000 DEG C；Control finish rolling finishing temperature, at 880～970 DEG C, controls finish rolling every time reduction ratio of finish to gauge previous three passes and is not less than 6%, and last three passages add up reduction ratio and are not less than 30%；
5) air cooling is to room temperature stand-by.
Table 1 various embodiments of the present invention and the chemical constituent of comparative example and weight percentage
Table 2 various embodiments of the present invention and the main technologic parameters of comparative example
| Embodiment | Slab heating temperature | Roughing finishing temperature | Finish rolling finishing temperature |
| 1 | 1283℃ | 1084℃ | 945℃ |
| 2 | 1264℃ | 1092℃ | 953℃ |
| 3 | 1260℃ | 1103℃ | 912℃ |
| 4 | 1271℃ | 1140℃ | 944℃ |
| 5 | 1291℃ | 1095℃ | 907℃ |
| 6 | 1265℃ | 1130℃ | 929℃ |
| 7 | 1287℃ | 1195℃ | 904℃ |
| 8 | 1270℃ | 1151℃ | 885℃ |
| Comparative example 1 | 1243℃ | 1083℃ | 847℃ |
| Comparative example 2 | 1220℃ | 1150℃ | 845℃ |
Table 3 various embodiments of the present invention and the mechanics of comparative example and weather resistance testing result
Note: steel grade weather resistance is to be evaluated by the rate of corrosion in neutral salt spray test 720h cycle.
By table 3 data it can be seen that
1) elongation percentage of embodiments of the invention steel product, yield tensile ratio entirety are better than compared steel.
2) embodiments of the invention steel weather resistance is more than doubled relative to CortenB steel, also superior to compared steel.
The present invention is not limited to above-mentioned specific embodiment.
Claims (1)
1. a high-elongation low yield strength ratio ferrite weathering steel, its component and weight percent content: C:0.00082%, Si:0.03%, Mn:0.25%, P:0.008%, S:0.002%, Nb:0.040%, Ti:0.050%, Ca:0.0010%, Mg:0.0040%, RE:0.016%, O:0.0016%, Sn:0.07%, Sb:0.06%, Zn:0.06%, remaining for Fe and is inevitably mingled with；
Production stage:
1) desulfurizing iron converter smelting are carried out；
2) in RH stove, application of vacuum is carried out: adding Mg, Ca element in processing procedure, and make Ca 0.0010%, Mg is 0.0040%, and O is 0.0016%；
3) strand is heated, control heating-up temperature at 1283 DEG C；
4) carry out segmentation rolling, control roughing end temp at 1084 DEG C；Control finish rolling finishing temperature, at 945 DEG C, controls finish rolling every time reduction ratio of finish to gauge previous three passes and is not less than 6%, and last three passages add up reduction ratio and are not less than 30%；
5) air cooling is to room temperature stand-by.
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| CN107460412B (en) * | 2017-07-26 | 2020-01-07 | 河钢股份有限公司承德分公司 | High-strength and high-toughness corrosion-resistant steel and rolling method thereof |
| CN107502834B (en) * | 2017-08-25 | 2020-01-07 | 河钢股份有限公司承德分公司 | Fe-Cr-based multicomponent alloy and rolling process thereof |
| CN113136530A (en) * | 2021-03-10 | 2021-07-20 | 首钢集团有限公司 | Corrosion-resistant steel and preparation method and application thereof |
| CN113621873B (en) * | 2021-08-19 | 2022-04-08 | 宝武集团鄂城钢铁有限公司 | Weather-resistant structural steel with stabilized rust layer and preparation method thereof |
| CN114657459B (en) * | 2022-02-21 | 2022-11-18 | 长沙东鑫环保材料有限责任公司 | Nitrogen-vanadium-titanium-niobium rare earth microalloyed high-strength deep-drawing cold-rolled steel plate and production method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1715432A (en) * | 2004-06-29 | 2006-01-04 | 株式会社神户制钢所 | Corrosion resistance excellent steel for ship |
| CN101775541A (en) * | 2010-03-09 | 2010-07-14 | 武汉钢铁(集团)公司 | Quake-proof construction steel with yield strength of 160MPa and production method thereof |
| CN101775542A (en) * | 2010-03-09 | 2010-07-14 | 武汉钢铁(集团)公司 | Quake-proof construction steel with yield strength of 100MPa and production method thereof |
| CN103469058A (en) * | 2013-10-08 | 2013-12-25 | 武汉钢铁(集团)公司 | Ferrite bainitic steel with 450MPa-grade tensile strength and high broaching performance and production method thereof |
| CN103667905A (en) * | 2013-12-04 | 2014-03-26 | 武汉钢铁(集团)公司 | Ultra-fine grain structural steel with excellent plasticity and toughness and production method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5989723A (en) * | 1982-11-15 | 1984-05-24 | Kawasaki Steel Corp | Manufacture of steel sheet for working by continuous casting and direct hot rolling |
| JP4705508B2 (en) * | 2006-04-17 | 2011-06-22 | 新日本製鐵株式会社 | Low yield point steel for damper and manufacturing method thereof |
| JP2009242912A (en) * | 2008-03-31 | 2009-10-22 | Jfe Steel Corp | Method for melting and manufacturing titanium-added ultra-low carbon steel and method for producing titanium-added ultra-low carbon steel cast slab |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1715432A (en) * | 2004-06-29 | 2006-01-04 | 株式会社神户制钢所 | Corrosion resistance excellent steel for ship |
| CN101775541A (en) * | 2010-03-09 | 2010-07-14 | 武汉钢铁(集团)公司 | Quake-proof construction steel with yield strength of 160MPa and production method thereof |
| CN101775542A (en) * | 2010-03-09 | 2010-07-14 | 武汉钢铁(集团)公司 | Quake-proof construction steel with yield strength of 100MPa and production method thereof |
| CN103469058A (en) * | 2013-10-08 | 2013-12-25 | 武汉钢铁(集团)公司 | Ferrite bainitic steel with 450MPa-grade tensile strength and high broaching performance and production method thereof |
| CN103667905A (en) * | 2013-12-04 | 2014-03-26 | 武汉钢铁(集团)公司 | Ultra-fine grain structural steel with excellent plasticity and toughness and production method thereof |
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