CN103695772B - Yield strength is 550MPa level fire resistant and weather resistant anti-shock construction(al)steel and production method thereof - Google Patents
Yield strength is 550MPa level fire resistant and weather resistant anti-shock construction(al)steel and production method thereof Download PDFInfo
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Abstract
Yield strength is 550MPa level fire resistant and weather resistant anti-shock construction(al)steel, its component and wt% are: C:0.041 ~ 0.125%, Si:0.31 ~ 0.62%, Mn:1.81 ~ 2.40%, P :≤0.008%, S :≤0.002%, Nb:0.041 ~ 0.065%, Ti:0.007 ~ 0.020%, Mo:0.41 ~ 0.63%, W:0.07 ~ 0.10%, Mg:0.0071 ~ 0.0098%, O :≤0.0012%; Production stage: desulfurizing iron; Converter smelting; Vacuum-treat, adds Mg element; Conventional continuous casting also heats strand; Segmentation rolling; Cool after finish to gauge, stand-by.Advantage of the present invention: chemical composition, technique are simple, steel plate yield strength is at 550 ~ 700MPa, and anti-seismic performance well i.e. yield tensile ratio≤0.83, the excellent i.e. 600 DEG C of yield strengths of fire performance are not less than 2/3 under room temperature, and corrosion resistance nature is better than CortenB.In addition, steel grade also has excellent impelling strength and welding property.
Description
Technical field
The present invention relates to a kind of construction(al)steel and production method thereof, belonging to a kind of yield strength is particularly 550MPa level fire resistant and weather resistant anti-shock construction(al)steel and production method thereof.
Background technology
Nigh-level synthesis thing is fast-developing, in intensity, fire resistance, weather resistance, anti-seismic performance etc., new requirement is all proposed to the steel plate for making the structural part such as post, beam, this is because: use high strength steel grade can perfect frame hardness of steel grade, avoid in following process, welding process, producing quality problems because thickness of steel product is excessive, also structural weight can be alleviated simultaneously, reduce laid down cost, reduce steel wastage, improve reliability of structure; The damage because the factor such as fire, earthquake causes structure can be reduced, extend personnel's evacuation time, reduce life and property loss, increase building safety use properties; Can reduce or exempt because of application, safeguard the expensive expense caused, reduce steel, because of corrosion, potential safety hazard is caused to structure.
Through retrieval, Chinese Patent Application No. CN201110080774.6 document discloses a kind of low-cost high-strength high-toughness shock-proof refractory steel and preparation technology thereof.This steel grade comprises following component by weight percentage: C:0.05% ~ 0.09%, Si:0.10% ~ 0.30%, Mn:0.60% ~ 1.00%, Mo:0.20% ~ 0.40%, Cr < 0.10%, Cu < 0.10%, Ni < 0.10%, Nb:0.02% ~ 0.04%, V:0.01% ~ 0.04%, Ti:0.01% ~ 0.04%, Al:0.02% ~ 0.04%, N≤0.006%, P≤0.010%, S≤0.006%, and Fe and impurity.Its preparation technology comprises the isothermal holding, two-phase control rolling and the refrigerating work procedure that carry out successively.Steel grade of the present invention adopts Mo+Nb alloy system, and composition is simple, and noble alloy constituent content is few, cost of alloy is low, and yield strength is high, and anti-seismic performance is good, and there is good impelling strength, simultaneously owing to have employed advanced controlled rolling and controlled cooling technique, process costs is also lower.It is 460MPa level that the document relates to steel grade intensity, and P, S content is relatively high, also has a certain impact to the follow-up welding property of steel grade, and in addition, this steel grade does not have good weathering performance yet.
Chinese Patent Application No. CN200910196233.2 document, disclose a kind of weather-resistant steel plate, its consisting of by weight percentage: C:0.06% ~ 0.09%, Si :≤0.30%, Mn:1.10% ~ 1.50%, P :≤0.015%, S :≤0.003%, Als:0.035% ~ 0.065%, Cu:0.25% ~ 0.50%, Ni:0.20% ~ 0.50%, Cr:0.40% ~ 0.70%, Mo:0.05% ~ 0.15%, Ti:0.008% ~ 0.018%, V:0.030% ~ 0.060%, Nb:0.015% ~ 0.030%, N≤0.0055%, Ca:0.001% ~ 0.004%, selectivity adds B:0.0004% ~ 0.0010%, all the other are for iron and be inevitably mingled with.Its manufacture method comprises: → TMCP → steel plate slow cooling is cut → heated to molten iron deep desulfuration → converter smelting → LF → RH → continuous casting → slab finishing → slab scale fire that rolls off the production line.The weather-resistant steel plate obtained like this has obdurability and strong plasticity coupling, low yield strength ratio, resistance to atmospheric corrosion, superior weldability and anti-fatigue performance, is particularly suitable for being used as without application high building structure, bridge structure.It is 490MPa level that the document relates to steel grade intensity, in steel, elementary composition relation limits complicated, containing more Cu, Cr, Ni noble element, not there is obvious fire performance yet, and need 300 DEG C of insulations at least 24 hours after steel plate rolling, this extends the production time undoubtedly, adds process cost, is unfavorable for scale operation.In addition, in steel, P content is higher, and containing martensitic stucture, and martensite is unstable tissue, and it extends steel plate, bending, impelling strength all can cause disadvantageous effect.
The deficiency of above-mentioned patent documentation general character: steel grade intensity rank is relatively not high; Steel plate possesses fire-resistant, weather resistance time different; Cu, Cr, Ni noble element containing more amount in steel.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, providing a kind of yield strength to be not less than 550MPa, having the yield strength of excellent fire-resistant, weather-proof and anti-seismic performance is simultaneously 550MPa level weather-resisting anti-seismic steel for building and production method thereof.
Realize the measure of above-mentioned purpose:
Yield strength is 550MPa level fire resistant and weather resistant anti-shock construction(al)steel, and its component and weight percent content are: C:0.041 ~ 0.125%, Si:0.31 ~ 0.62%, Mn:1.81 ~ 2.40%, P :≤0.008%, S :≤0.002%, Nb:0.041 ~ 0.065%, Ti:0.007 ~ 0.020%, Mo:0.41 ~ 0.63%, W:0.07 ~ 0.10%, Mg:0.0071 ~ 0.0098%, O :≤0.0012%, all the other are for Fe and be inevitably mingled with; Performance: yield strength: 550 ~ 700MPa, yield tensile ratio≤0.83,600 DEG C of yield strengths are not less than 2/3 under room temperature, and corrosion resistance nature is better than CortenB.
It is characterized in that: be added with Sn:0.09 ~ 0.12% or Zn:0.08 ~ 0.12% or two kinds with the mixture of arbitrary proportion.
Preferably S :≤0.001%.
Production yield strength is the method for 550MPa level fire resistant and weather resistant anti-shock construction(al)steel, its step:
1) carry out desulfurizing iron, and control S≤0.001% in molten iron;
2) carry out converter smelting, and control C:0.041 ~ 0.125% in molten steel, P≤0.008%;
3) in RH stove, carry out vacuum-treat, add Mg element, make Mg:0.0071 ~ 0.0098%, and control O≤0.0012%;
4) conventional continuous casting and to strand heating, control Heating temperature at 1200 ~ 1320 DEG C;
5) segmentation rolling is carried out, control roughing start rolling temperature at 1080 ~ 1190 DEG C, control finish rolling start rolling temperature not higher than 985 DEG C, control finish rolling finishing temperature at 810 ~ 860 DEG C, control previous three passes draught per pass and be not less than 5%, last three passages add up draft and are not less than 30%;
6) cool after finish to gauge, begin to cool down temperature and control at 720 ~ 800 DEG C, controlled cooling model speed, at 2.0 ~ 9.5 DEG C/sec, controls red temperature≤550 DEG C; Stand-by.
The effect of each element in the present invention
C improves the most effective element of steel strength, tensile strength and the yield strength of the increase steel of carbon content improve thereupon, but unit elongation and impact toughness decreased, corrosion resistance also can decline, and the welded heat affecting zone of steel also there will be phenomenon of hardening, cause the generation of welding cold cracking.For ensureing that steel plate obtains good over-all properties, steel carbon element content of the present invention is designed to 0.041 ~ 0.125%.
Si can improve the corrosion resistance nature of steel, often be added in stainless steel, low alloy steel, non-corrosive metal, to improve the solidity to corrosion of these alloys, the performances such as resistance to muriate stress corrosion cracking, resistance to spot corrosion, resistance to hot concentrated burn into are anti-oxidant, seawater corrosion resistance that make them have.Research shows, in damp and hot atmospheric environment, Si obviously can improve the atmospheric corrosion resistance of carbon steel and low alloy steel, and in addition, Si can also improve the solidity to corrosion of low alloy steel splash(spray)zone in the seawater.The Si content of steel of the present invention is designed to 0.31 ~ 0.62%.
Mn is important highly malleablized element, and along with the increase of Mn content, the intensity of steel obviously increases, and impact transition temperature changes hardly.Mn containing 1% approximately can improve tensile strength 100MPa, and meanwhile, Mn slightly improves the effect of the atmospheric corrosion resistance of steel.Steel mechanical property of the present invention requires higher, and the corrosion resistance nature of comprehensive steel, Mn content is designed to 1.81 ~ 2.40% by steel of the present invention.
P, S are the impurity elements in steel.P tool improves erosion resistance effect, but P is a kind of element being easy to segregation, produces macrosegregation in the local of steel, reduces plasticity and toughness, very harmful to low-temperature flexibility.S element is easy to segregation and enrichment in steel, is the element to corrosion resistance nature evil.Steel of the present invention, strictly controls sulphur, phosphorus content level, i.e. P≤0.008%, S≤0.002%, preferred S :≤0.001% in metallurgical quality, to meet the requirement of steel grade to purity, impelling strength, welding property and corrosion resistance nature.
Ti, Nb are two kinds of strong carbide and nitride forming element, in the process of steel plate roller repairing, separate out carboritride, improve armor plate strength.Meanwhile, because precipitate melting temperature (Tm) is higher, steel plate can be improved the intensity of 600 DEG C, improve fire performance.Ti, Nb constituent content controls as Ti:0.007 ~ 0.020%, Nb:0.041 ~ 0.065% by the present invention.
Mo, W element can improve the homogeneity of corrosion, suppresses local corrosion.In addition, Mo, W improve the most effective element of steel plate hot strength.Especially Mo element, its content is higher usually, and its hot strength is higher, but Mo element cost is higher, and the excessive welding property that causes declines, and therefore, the control of Mo, W content is by the present invention: Mo:0.41 ~ 0.63%, W:0.07 ~ 0.10%.
Mg is that a metal activity is strong especially, fusing point and all lower alkaline-earth metal of boiling point.In steel, there are desulfurization, deoxidation, minimizing inclusion distribution and change the effect of inclusion shape, be all far smaller than inclusion number in the total and unit surface of aluminium deoxidation steel inclusion through Ca process through Al deoxidization steel inclusion number on inclusion sum and unit surface of Mg process; Reach in control molten steel total oxygen content with Mg process Al deoxidization steel and be slightly better than Ca process Al deoxidization steel, and being obviously better than independent aluminium-deoxidized steel, so the present invention's Clean Steel of magnesium process for producing Ultra Low-oxygen.In addition, Mg dissolves can improve pH value, and the pH value that the hydrolysis reaction on the local anode that causes because of dissolved ferric iron can be suppressed to cause reduces, and namely suppresses corrosion reaction, improves solidity to corrosion.Steel Mg content of the present invention controls in 0.0071 ~ 0.0098% scope, and O content controls as≤0.0012%.
Sn element can improve the resistance to general corrosion performance under dry wet environment repeatedly, and improves acid-resistant corrosion.In addition, the effect of erosion resistance is improved under also there is seawater spittle environment when pH value reduces.Its content is chosen as Sn:0.09 ~ 0.12% by the present invention respectively.
Zn can with salinity or reaction of Salmon-Saxl, by forming protective membrane thus is cut off by the moisture in matrix and environment on steel surface, thus reach the effect that suppression corrodes.Zn content of the present invention is chosen as 0.08 ~ 0.12%.
Steel tool of the present invention has the following advantages:
1) steel plate chemical composition, technique are simple, armor plate strength high (yield strength: 550 ~ 700MPa), anti-seismic performance good (yield tensile ratio≤0.83), and fire performance excellent (600 DEG C of yield strengths are not less than 2/3 under room temperature), corrosion resistance nature is better than CortenB.In addition, steel grade also has excellent impelling strength and welding property.
2) controlled by low S content (S≤0.002), utilize Mg deoxidation and control steel inclusion quantity, form, reach and suppress corrosion reaction to improve corrosion proof effect, and add the elements such as Sn, Zn in right amount and improve steel grade solidity to corrosion further.Steel of the present invention does not add the conventional raising such as Cu, Cr, Ni solidity to corrosion noble element.
3) steel of the present invention can be used for all having certain requirements building structure and device to armor plate strength, fire performance, weathering performance, anti-seismic performance.Can improve or reduce because of fire, the seismic personnel of burn into and property damage, reduce maintenance cost, improve safety in utilization.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation.
Various embodiments of the present invention are produced according to following steps:
1) carry out desulfurizing iron, and control S≤0.001% in molten iron;
2) carry out converter smelting, and control C:0.041 ~ 0.125% in molten steel, P≤0.008%;
3) in RH stove, carry out vacuum-treat, add Mg element, make Mg:0.0071 ~ 0.0098%, and control O≤0.0012%;
4) conventional continuous casting and to strand heating, control Heating temperature at 1200 ~ 1320 DEG C;
5) segmentation rolling is carried out, control roughing start rolling temperature at 1080 ~ 1190 DEG C, control finish rolling start rolling temperature not higher than 985 DEG C, control finish rolling finishing temperature at 810 ~ 860 DEG C, control previous three passes draught per pass and be not less than 5%, last three passages add up draft and are not less than 30%;
6) cool after finish to gauge, begin to cool down temperature and control at 720 ~ 800 DEG C, controlled cooling model speed, at 2.0 ~ 9.5 DEG C/sec, controls red temperature≤550 DEG C; Stand-by.
The chemical composition of table 1 various embodiments of the present invention and comparative example and weight percentage
The main technologic parameters of table 2 various embodiments of the present invention and comparative example
Table 3 various embodiments of the present invention and comparative example mechanics properties testing result
Note: what steel grade fire performance was not less than under room temperature with 600 DEG C of yield strengths 2/3 evaluates; Weather resistance is by the mass loss evaluation after week leaching corrosion test 264h, and concrete corrosion test condition is as follows:
Testing liquid: 1.0 × 10
-2mol/LNaHSO
3; Supply solution: 2.0 × 10
-2mol/LNaHSO
3;
Test temperature: 45 ± 2 DEG C; Relative humidity: 70 ± 5%; Week leaching wheel speed: 1 circle/60 minutes.
Can be found out by table 3 data:
1) yield strength of embodiments of the invention steel product, impelling strength entirety are better than compared steel.And compared steel 1, compared steel 2 yield strength all do not reach 550MPa;
2) embodiments of the invention steel fire performance is excellent, meet the regulation that 600 DEG C of yield strengths are not less than under room temperature 2/3, and compared steel 2 fire performance does not meet the demands;
3) embodiments of the invention steel weather resistance is more than doubled relative to CortenB steel, is also better than compared steel.
In general, compared steel 1 meets fire performance requirement, but weather resistance is poor; Compared steel 2 weather resistance is better than compared steel 1 relatively, but fire performance is undesirable.As can be seen here, steel of the present invention is that a kind of yield strength is not less than 550MPa, has excellent fire-resistant, weather-proof and anti-seismic performance structure iron for building, high comprehensive performance simultaneously.
Above-mentioned is detailed description for the embodiment of the present invention; the researchist in the technology of the present invention field can make the change of unsubstantiality in formal or content aspect according to above-mentioned steps; and do not depart from the scope of institute of the present invention essence protection; therefore, the present invention is not limited to above-mentioned concrete embodiment.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. produce and take the method that intensity is 550MPa level fire resistant and weather resistant anti-shock construction(al)steel, its step:
1) carry out desulfurizing iron, and control S≤0.001% in molten iron;
2) carry out converter smelting, and control C:0.041 ~ 0.125% in molten steel, P≤0.008%;
3) in RH stove, carry out vacuum-treat, add Mg element, make Mg:0.0071 ~ 0.0098%, and control O≤0.0012%;
4) conventional continuous casting and to strand heating, control Heating temperature at 1200 ~ 1320 DEG C; The component of strand and weight percent content are: C:0.041 ~ 0.125%, Si:0.31 ~ 0.62%, Mn:1.81 ~ 2.40%, P :≤0.008%, S :≤0.002%, Nb:0.041 ~ 0.065%, Ti:0.007 ~ 0.020%, Mo:0.41 ~ 0.63%, W:0.07 ~ 0.10%, Mg:0.0071 ~ 0.0098%, O :≤0.0012%, all the other are for Fe and be inevitably mingled with; Performance: yield strength: 550 ~ 700MPa, yield tensile ratio≤0.83,600 DEG C of yield strengths are not less than 2/3 under room temperature, and corrosion resistance nature is better than CortenB;
5) segmentation rolling is carried out, control roughing start rolling temperature at 1080 ~ 1190 DEG C, control finish rolling start rolling temperature not higher than 985 DEG C, control finish rolling finishing temperature at 810 ~ 860 DEG C, control previous three passes draught per pass and be not less than 5%, last three passages add up draft and are not less than 30%;
6) cool after finish to gauge, begin to cool down temperature and control at 720 ~ 800 DEG C, controlled cooling model speed, at 2.0 ~ 9.5 DEG C/sec, controls red temperature≤550 DEG C; Stand-by.
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| 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 |
| CN115181882B (en) * | 2022-09-09 | 2022-12-23 | 江苏省沙钢钢铁研究院有限公司 | 500 MPa-grade refractory deformed steel bar and production method thereof |
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| CN101418416A (en) * | 2007-10-26 | 2009-04-29 | 宝山钢铁股份有限公司 | Low welding crack sensitivity steel plate with yield strength of 800MPa grade and method for producing the same |
| CN102686760A (en) * | 2010-07-09 | 2012-09-19 | 住友金属工业株式会社 | Corrosion-resistant steel material for cargo oil tank |
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| JPH10140237A (en) * | 1996-11-08 | 1998-05-26 | Nisshin Steel Co Ltd | Production of cold rolled steel sheet and hot-dip metal coated cold rolled steel sheet for building material, excellent in fire resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101418416A (en) * | 2007-10-26 | 2009-04-29 | 宝山钢铁股份有限公司 | Low welding crack sensitivity steel plate with yield strength of 800MPa grade and method for producing the same |
| CN102686760A (en) * | 2010-07-09 | 2012-09-19 | 住友金属工业株式会社 | Corrosion-resistant steel material for cargo oil tank |
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