CN102605287A - Steel for high-ductility anti-seismic structure with yield ratio smaller than or equal to 0.70 and production method of steel - Google Patents
Steel for high-ductility anti-seismic structure with yield ratio smaller than or equal to 0.70 and production method of steel Download PDFInfo
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Abstract
The invention relates to steel for a high-ductility anti-seismic structure with the yield ratio smaller than or equal to 0.70 and a production method of the steel. The steel consists of chemical components including, by weight, from 0.03 to 0.10% of C, from 0.16 to 0.62% of Si, from 1.00 to 2.20% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.010% of S, from 0.12 to 0.645% of Cu, from 0.12 to 0.64% of Cr, from 0.06 to 0.32% of Mo, from 0.010 to 0.062% of Nb, from 0.12 to 0.38% of Ni and from 0.0015 to 0.020% of Zr or from 0.0010 to 0.020% of RE or a combination of the Ni and the Zr, the chemical components meet formulas that Cu+Cr is larger than or equal to 0.60% and smaller than or equal to 1.2%, Pcm is smaller than or equal to 0.24%, and Zr+Re is smaller than or equal to 0.025%. The production method includes steps: smelting and externally refining; protectively pouring in a whole process; heating a casting blank; roughing; precisely rolling; realizing laminar cooling; and naturally cooling to reach the room temperature. Pcm is smaller than or equal to 0.24, the yield ratio (ReL/Rm is larger than or equal to 0.70) is low, safety factors are high, the steel is non-quenched and tempered steel, the steel is delivered in a rolling control state, a production process is simple, and the production method is easy in implementation.
Description
Technical field
The present invention relates to structural engineering with steel and method of manufacture thereof, specifically belong to yield tensile ratio less than 0.7 H.T. anti-seismic structure with steel and working method thereof.
Background technology
Along with the high speed development of domestic economy, the steelwork industry is just becoming a good great market of domestic and international steel industry.The requirement of developing a circular economy and building a conservation-minded society according to State Council; In Steel Structure Work, answer widespread use high-performance steel; Reduce steel consumption, improve the SF and the work-ing life of steel, improve the steel service efficiency; Walk the cycle development process of " resource-product-waste-renewable resource ", obtain big as far as possible society and economic benefit with the least possible resource.But the considerable damage that Wenchuan and Japanese violent earthquake cause has caused the thinking of metallurgy industry worker to the structural steel anti-seismic performance, when using the high-performance steel, must pay attention to the anti-seismic performance of steel.Therefore; In recent years; Great Steel Structure Works such as high-rise building, ocean platform, steel for pipe, large bridge, factories and miness and stadiums are increasingly high to the performance requriements of steel; When requiring steel to have good basic mechanical performance, also require steel to have excellent anti-seismic performance, i.e. low yield strength ratio.
The present invention relevant for the report of low yield strength ratio structure iron, has also applied for related patent U.S. Patent No. both at home and abroad in the past.Disclose a kind of deformability good superstrength Welded Steel Pipe and method of manufacture thereof like Japanese Patent JP2007260716, this steel chemical composition is: C:0.03-0.12%, and Si :≤0.50%, Mn:1.80-3.0%, P≤0.010%; S≤0.002%, Cu≤0.70%, Ni:0.01-3.0%, Cr≤1.0%; Mo≤1.0%, Nb:0.01-0.08%, V≤0.10%, Ti:0.005-0.025%; B≤0.005%, Ca≤0.01%, REM≤0.02%, Zr≤0.03%; Mg≤0.01%, N:0.001-0.006%, Pcm≤0.22%, all the other are Fe and unavoidable impurities.But this invention steel has added more valuable alloy Ni, Mo, and steel plate must carry out the reheat treatment process, has increased production cost, and its chemical ingredients, production technique and product strength rank are different with steel of the present invention.
The patent No. is that 201110218100.8 Chinese patent discloses a kind of low yield strength ratio high-plastic ultra-fine crystal grain high-strength steel and method of manufacture thereof; Its chemical ingredients is: C:0.06-0.09%, Si:0.15-0.25%, Mn:1.20-1.50%, P≤0.015%, S≤0.005%, Nb:0.020-0.040%, V:0.010-0.030%, Ti:0.008-0.015%, Cr:0.10-0.30%, Ni:0.10-0.30%, Cu:0.10-0.30%, Al:0.010-0.050%, surplus is Fe and unavoidable impurities.This invention steel chemical composition is different with steel of the present invention, and its production technique employing TMCP+ off-line heat-treatment technology method, has increased production cost.Also having the patent No. is that the Chinese patent of 200910012359.X discloses a kind of method of manufacture of making cantilever steel pipe with high strength and high toughness with hot-rolled coil; Its chemical ingredients is C:0.10-0.20%, Si:0.10-0.45%, Mn:0.70-1.45%, Ni:0.02-0.80%, Cr:0.15-0.65%, Mo:0.20-0.65%, Cu:0-0.30%, Nb:0.010-0.060%, V:0.020-0.070%, Ti:0.002-0.030%, Al:0.010-0.065%, B:0.0005-0.0040%, Zr:0-0.0005%, P＜0.020%, S＜0.010%, N＜0.0080%, and all the other are Fe.The deficiency of its existence: valuable alloying element Ni, Mo content are higher, and steel plate must quench+temper, have increased production cost.
The patent No. is hot-rolled steel sheet and the working method thereof that the Chinese patent of 201010218179.X discloses a kind of tensile strength 590MPa level; Its chemical ingredients is C:0.05-0.10%, Si:0.10-0.25%, Mn:1.10-1.50%, P:0.03-0.08%, S≤0.008%, Cr:0.50-0.80%, Als:0.015-0.065%; The deficiency of its existence: P content is higher; The tensile strength rank is lower, and steel plate thickness also is merely 2.5-6.0mm.
Also having Chinese patent number is 200910061106.1,200910012361.7,200910012360.2 and 200610125365.2 patent documentation, and the deficiency of its existence: steel plate all must carry out the complicated heat treatment operation, has increased production cost.
Summary of the invention
The object of the invention is to overcome the deficiency that the present technique field exists at present; High, the excellent earthquake resistance of low-temperature flexibility of a kind of low-carbon (LC) Cu (Cr)-Mo system is provided; Good cold and hot working performance and welding property; Simultaneously ME is simple, and production cost is low, and the H.T. anti-seismic structure of yield tensile ratio≤0.70 that is easy to scale operation is with steel and working method thereof.
Realize the measure of above-mentioned purpose:
The H.T. anti-seismic structure of a kind of yield tensile ratio≤0.70 is used steel, and its chemical ingredients and weight percent are: C:0.03～0.10%, Si:0.16～0.62%; Mn:1.00～2.20%, P≤0.010%, S≤0.010%; Cu:0.12～0.645%, Cr:0.12～0.64%, Mo:0.06～0.32%; Nb:0.010～0.062%; Ni:0.12～0.38%, and Zr:0.0015～0.020% or RE:0.0010～0.020% or its are compound, surplus is Fe and unavoidable impurities; And satisfy formula: 0.60%≤Cu+Cr≤1.20%, Pcm≤0.24%, Zr+RE≤0.025%.
It is characterized in that: also be added with V 0.015～0.050% or Ti≤0.030% or Als≤0.058% or wherein any two kinds and above compound with arbitrary proportion.
The H.T. anti-seismic structure of a kind of yield tensile ratio≤0.70 is used steel, and its chemical ingredients and weight percent are: C:0.03～0.10%, Si:0.16～0.62%; Mn:1.00～2.20%, P≤0.010%, S≤0.010%; Cu:0.65～1.20%, Mo:0.06～0.32%, Nb:0.010～0.062%; Ni:0.12～0.38%, and Zr:0.0015～0.020% or RE:0.0010～0.020% or its are compound, surplus is Fe and unavoidable impurities; And satisfy formula: Pcm≤0.24%, Zr+RE≤0.025%.
It is characterized in that: also be added with V 0.015～0.050% or Ti≤0.030% or Als≤0.058% or wherein any two kinds and above compound with arbitrary proportion.
The H.T. anti-seismic structure of a kind of yield tensile ratio≤0.70 is used steel, and its chemical ingredients and weight percent are: C:0.03～0.10%, Si:0.16～0.62%; Mn:1.00～2.20%, P≤0.010%, S≤0.010%; Cr:0.65～1.20%, Mo:0.06～0.32%, Nb:0.010～0.062%; Ni:0.12～0.38%, and Zr:0.0015～0.020% or RE:0.0010～0.020% or its are compound, surplus is Fe and unavoidable impurities; And satisfy formula: Pcm≤0.24%, Zr+RE≤0.025%.
It is characterized in that: also be added with V 0.015～0.050% or Ti≤0.030% or Als≤0.058% or wherein any two kinds and above compound with arbitrary proportion.
Produce the method for the H.T. anti-seismic structure of a kind of yield tensile ratio≤0.70, its step with steel:
1) smelts and carry out external refining;
2) adopt the whole process protection to pour into base;
3) to the strand heating, the control Heating temperature is at 1260～1340 ℃, and heating rate is controlled at 7～10min/cm, and under 1180～1250 ℃, is incubated 30min at least;
4) carry out roughing: the controlled rolling passage is 3～5 passages, and the control finishing temperature is 1000～1080 ℃;
5) carry out finish rolling: the controlled rolling passage is 5～8 passages, and always the rate of pressing down is 37～80%, and finishing temperature is 770～840 ℃;
6) carry out the laminar flow cooling: cooling termination temperature is controlled to be 580～680 ℃;
7) naturally cool to room temperature.
The reason of chemical ingredients limited amount among the present invention below is detailed:
C content of the present invention is chosen in 0.03～0.10%; C is the principal element that improves intensity; Yield tensile ratio to reducing steel is favourable, but high carbon content can worsen plasticity, toughness, the welding property of steel and the tendency that increases carbon segregation, influences the cold and hot working performance of steel.Therefore, consider the over-all properties level of steel, carbon content is defined as 0.03～0.10%.
Si content of the present invention is chosen in 0.16～0.62%, and Si mainly improves the intensity of steel with the solution strengthening form, also be the deoxidant element in the steel, and is also little to the yield tensile ratio influence of steel.But Si too high levels, the significantly low-temperature flexibility and the welding property of reduction steel.The intensity of overall equilbrium steel and toughness, the Si upper content limit is decided to be 0.62% among the present invention.
Mn content of the present invention is chosen in 1.00～2.20%, and Mn guarantees steel strength and the indispensable element of toughness.In the operation of rolling, Mn crystal grain thinning, the intensity and the toughness of raising steel.But the Mn too high levels then can form more MnS inclusion, reduces the low temperature fracture toughness of steel, improves steel plate in length and breadth to performance difference.
P of the present invention≤0.010%, S≤0.010%, P, S are the detrimental impurity elements in the steel.High P is prone to cause segregation, influences the homogeneity of structure of steel, reduces the toughness of steel; S and Mn are prone to form MnS and are mingled with, and be very unfavorable to low-temperature flexibility, and cause the anisotropy of performance.
Nb content of the present invention is chosen in 0.010～0.062%, and Nb is the important element of crystal grain thinning, can significantly improve austenite recrystallization temperature, is easy at high temperature rollingly, reduces mill load, prolongs its work-ing life.In the controlled rolling and controlled cooling process, niobium is easy in matrix or along the dislocation disperse, separate out tiny NbC particle, and the grain refining effect is obvious, thereby improves the intensity and the low-temperature flexibility of steel.Nb also forms and is evenly distributed with C, N, stable high carbonitride particle, effectively suppresses growing up of austenite crystal, enlarges the TR of material hot-work and welding.
V content of the present invention is limited in 0.015～0.050%, and V is a kind of suitable intensive carbide forming element.Add fashionablely when Nb and V are compound, can obviously improve the generation of transverse crack phenomenon.But the V too high levels, the precipitation strength effect is remarkable, but the toughness variation is unfavorable for controlling low yield strength ratio.
Ni content of the present invention is chosen in 0.12～0.38%, and Ni is little to the steel strength contribution, but can obviously improve the low-temperature flexibility of steel, and particularly to high steel of solution strengthening constituent content such as Cu, Cr, its effect that improves low-temperature flexibility is just more obvious.But the Ni too high levels, except that increasing production cost, surface of steel plate is prone to produce the iron scale that is difficult to come off.
Mo content of the present invention is chosen in 0.06～0.32%, and the solution strengthening effect of Mo is very big, and the adding of Mo can also promote the formation of high density dislocation bainite, produces build up.When Mo and Nb add fashionablely simultaneously, molybdenum can also increase the carbide nucleation site, promotes carbide to form, and produces precipitation strength.But the Mo too high levels can reduce the low-temperature flexibility of steel and the welding crack sensibility of raising steel.
Cu of the present invention, Cr content all are chosen in below 0.12～0.65 and reach 0.65～1.20%; Its reason is that Cu mainly plays the solution strengthening effect; Proper C r also can improve the intensity of steel, but the steel billet of Cu too high levels is prone to the generation map cracking in heat-processed, cause steel scrap; The Cr too high levels causes the fragility of steel to increase.Consider the comprehensive mechanical property of steel, Cu, Cr content also must satisfy 0.60%≤Cu+Cr≤1.20%.
Ti of the present invention≤0.030%, an amount of Ti can improve the toughness of weld metal, but excessive Ti can make it again to reduce.Ti and Nb, V add simultaneously, can further improve the steel austenite recrystallization temperature, enlarge the rolling technology scope.The second phase particle TiN of Ti, Ti (CN) particle can effectively stop the heating with welding process in austenite crystal grow up, make grain refining, the raising steel low-temperature flexibility.
Als content of the present invention is chosen in 0.010～0.058%, and Als is the main deoxidant element in the steel, also is the crystal grain thinning element.The Al too high levels is prone to cause be mingled with in the steel and increases, and reduces the purity of steel, is unfavorable for the low-temperature flexibility of steel.
Zr content of the present invention is chosen in 0.0015～0.020%, and an amount of Zr can purify steel with non-Spherical Inhomogeneity thing nodularization thick in the steel, improves the low-temperature flexibility and the lear energy of steel.
RE content of the present invention is chosen in 0.0010～0.020%.The main effect of RE is for making the sulfide inclusion nodularization in the steel, to improve in length and breadth to performance difference, improving toughness.
The present invention compared with prior art has Pcm≤0.24, promptly has lower welding crack sensibility, lower yield tensile ratio (R
EL/ R
m≤0.70), SF is big, and is improved work-ing life, and is non-hardened and tempered steel, with the delivery of controlled rolling state, need not pass through the complicated heat treatment operation, and production sequence is simple, is easy to scale operation.
Embodiment
Describe in detail in the face of the present invention down:
The test conditions of each embodiment: each is implemented and the chemical ingredients and the weight percent content of Comparative Examples are seen table 1;
Each is implemented and the main technologic parameters of Comparative Examples is seen table 2, and according to following steps production:
1) smelts and carry out external refining;
2) adopt the sequence casting protection to pour into base;
3) to the strand heating, the control Heating temperature is at 1260～1340 ℃, and heating rate is controlled at 7～10min/cm, and under 1180～1250 ℃, is incubated 30min at least;
4) carry out roughing: the controlled rolling passage is 3～5 passages, and the control finishing temperature is 1000～1080 ℃;
5) carry out finish rolling: the controlled rolling passage is 5～8 passages, and always the rate of pressing down is 37～80%, and finishing temperature is 770～840 ℃;
6) carry out the laminar flow cooling: cooling termination temperature is controlled to be 580～680 ℃;
7) naturally cool to room temperature.
For making the abundant austenitizing of strand; And make alloying elements such as Cu, Cr, Mo fully be dissolved in the austenite; Must be with above-mentioned strand 1260～1340 ℃ of heating, what need particularly point out is that the heating rate of steel billet must be controlled to be 7～10min/cm, and is below 800 ℃ the time in the strand temperature; Heating rate must be controlled between 7～8min/cm, and purpose is to guarantee that strand is unlikely to make steel billet crackle even fracture accident occur because of heating rate is too fast in heat-processed; When the strand temperature reached 800～1000 ℃, heating rate was controlled at 8～9min/cm; When the strand temperature reached more than 1000 ℃, heating rate can be increased to 10min/cm, to improve the heating efficiency of steel billet.In order to ensure steel billet internal and external temperature and each position full and uniformization of alloying constituent, strand must be incubated 30min at least under 1180～1250 ℃, but that soaking time is difficult for is long, otherwise the serious alligatoring of austenite crystal, worsens the low-temperature impact toughness of steel.
The bright steel of we is for the qualification reason of each parameter of rolling technology: roughing adopts high temperature to depress greatly; 3～5 passages are accomplished roughing; Finishing temperature is 1000～1080 ℃; Purpose is to guarantee that reduction in pass is 15～20mm, and carries out roughing and refine austenite crystal grain in the austenite recrystallization district fully, guarantees that steel have good obdurability coupling.Last pass is controlled to be 5～8 roads, and always the rate of pressing down is 37～80%, and finishing temperature is 770～840 ℃; The finish rolling stage must be rolling in austenite non-recrystallization district, and guarantee that passage and draft, purpose are that austenite crystal fully is elongated; Hinder growing up of proeutectoid ferrite crystal grain; Big deflection can increase the quantity of deformation bands, thereby phase deformed nucleus point is provided, and makes the ferrite crystal grain after the phase transformation more tiny evenly; In austenite non-recrystallization district when rolling; The increase of deflection can also impel transformation temperature to improve, thereby promotes ferritic quantity to increase, and reduces perlite quantity; Reduce the yield tensile ratio of steel; Guarantee the anti-seismic performance of steel plate, the purpose of control finishing temperature is for further refinement ferrite crystal grain, guarantees the obdurability of steel.Must cooperate follow-up laminar flow cooling technology behind the steel rolling of the present invention, promptly cooling termination temperature is controlled to be 580～680 ℃, because master control of the present invention is organized as ferritic and perlite; And the present invention contains the deterioration steel drift and hits alloying elements such as flexible Cu, Cr, Mo, therefore, has good low-temperature impact toughness for guaranteeing steel; Except the crystal grain thinning effect that utilizes the Ni to improve impelling strength and Nb; Also must combine controlled rolling and technology for controlled cooling,, reduce pearlite interlaminar spacing with further refine austenite and ferrite crystal grain; For the purpose of the present invention; When final cooling temperature is higher than 680 ℃, ferritic and pearlite colony are thick, cause the obdurability of steel relatively poor; When final cooling temperature was lower than 580 ℃, this moment, speed of cooling was too fast, cooling rate and tissue odds on the steel plate thickness direction, and promptly the steel plate top layer is the low-temperature transformation tissue, and heart portion is ferritic and pearlitic structure, causes plate property uneven, reduces low-temperature flexibility simultaneously.
Through inventor's repeated validation, the strict steel plate of above-mentioned determinant and processing parameter production that adopts has good obdurability coupling, excellent welding property and anti-seismic performance (R
EL/ R
m≤0.70) and cold-forming property, therefore, steel of the present invention need not to heat-treat processing, and technical process is simply effective, and production cost is low, is easy to scale operation.
Table 3 is mechanical property test the results list of each enforcement and Comparative Examples.
The chemical ingredients contrast of table 1 steel of the present invention and compared steel (wt, %)
The main technologic parameters tabulation of each enforcement of table 2 and Comparative Examples
Table 3 each implement and Comparative Examples the tabulation of mechanical property detected result
Steel plate of the present invention is to carry out normal temperature tensile property, Z to tensile property ,-20 ℃ of steel plate impact of collision flexible tests.Can find out that from table 3 at normal temperatures, the ys of steel of the present invention and compared steel are in same level, and tensile strength is than more than the high 100MPa of compared steel, and steel yield tensile ratio (R of the present invention
EL/ R
m) all less than 0.65, comparative steel is then greater than 0.77, this explanation steel of the present invention has more excellent anti-seismic performance; All more than 150J, the thickness direction relative reduction in area is more than 50% for ballistic work under the steel of the present invention-20 ℃ temperature, and all far above compared steel, this explanation steel of the present invention has good low-temperature flexibility and anti-lamellar tearing ability.In a word, steel of the present invention has more excellent comprehensive mechanical property.
Steel of the present invention need not pass through the complicated heat treatment operation with the delivery of controlled rolling state, and manufacturing course is simple, is easy to scale operation.Steel R of the present invention
EL>=420MPa, R
m>=650MPa, A>=25%, R
EL/ R
m≤0.70 ,-20 ℃ of KV
2>=150J has excellent low-temperature flexibility and anti-seismic performance.Steel of the present invention is of many uses, can be applicable to various Steel Structure Works such as all kinds of high-rise buildings, ocean platform, pipeline, large bridge, factories and miness and stadiums.
Claims (7)
1. the H.T. anti-seismic structure of yield tensile ratio≤0.70 is used steel, and its chemical ingredients and weight percent are: C:0.03～0.10%, Si:0.16～0.62%; Mn:1.00～2.20%, P≤0.010%, S≤0.010%; Cu:0.12～0.645%, Cr:0.12～0.64%, Mo:0.06～0.32%; Nb:0.010～0.062%; Ni:0.12～0.38%, and Zr:0.0015～0.020% or RE:0.0010～0.020% or its are compound, surplus is Fe and unavoidable impurities; And satisfy formula: 0.60%≤Cu+Cr≤1.20%, Pcm≤0.24%, Zr+RE≤0.025%.
2. the H.T. anti-seismic structure of a kind of yield tensile ratio as claimed in claim 1≤0.70 is used steel, it is characterized in that: also be added with V0.015～0.050% or Ti≤0.030% or Als≤0.058% or wherein any two kinds and above compound with arbitrary proportion.
3. the H.T. anti-seismic structure of yield tensile ratio≤0.70 is used steel, and its chemical ingredients and weight percent are: C:0.03～0.10%, Si:0.16～0.62%; Mn:1.00～2.20%, P≤0.010%, S≤0.010%; Cu:0.65～1.20%, Mo:0.06～0.32%, Nb:0.010～0.062%; Ni:0.12～0.38%, and Zr:0.0015～0.020% or RE:0.0010～0.020% or its are compound, surplus is Fe and unavoidable impurities; And satisfy formula: Pcm≤0.24%, Zr+RE≤0.025%.
4. the H.T. anti-seismic structure of a kind of yield tensile ratio as claimed in claim 3≤0.70 is used steel, it is characterized in that: also be added with V0.015～0.050% or Ti≤0.030% or Als≤0.058% or wherein any two kinds and above compound with arbitrary proportion.
5. the H.T. anti-seismic structure of yield tensile ratio≤0.70 is used steel, and its chemical ingredients and weight percent are: C:0.03～0.10%, Si:0.16～0.62%; Mn:1.00～2.20%, P≤0.010%, S≤0.010%; Cr:0.65～1.20%, Mo:0.06～0.32%, Nb:0.010～0.062%; Ni:0.12～0.38%, and Zr:0.0015～0.020% or RE:0.0010～0.020% or its are compound, surplus is Fe and unavoidable impurities; And satisfy formula: Pcm≤0.24%, Zr+RE≤0.025%.
6. the H.T. anti-seismic structure of a kind of yield tensile ratio as claimed in claim 5≤0.70 is used steel, it is characterized in that: also be added with V0.015～0.050% or Ti≤0.030% or Als≤0.058% or wherein any two kinds and above compound with arbitrary proportion.
7. the H.T. anti-seismic structure of the described a kind of yield tensile ratio of production claim 1 to 6≤0.70 is with the method for steel, its step:
1) smelts and carry out external refining;
2) adopt the whole process protection to pour into base;
3) to the strand heating, the control Heating temperature is at 1260～1340 ℃, and heating rate is controlled at 7～10min/cm, and under 1180～1250 ℃, is incubated 30min at least;
4) carry out roughing: the controlled rolling passage is 3～5 passages, and the control finishing temperature is 1000～1080 ℃;
5) carry out finish rolling: the controlled rolling passage is 5～8 passages, and always the rate of pressing down is 37～80%, and finishing temperature is 770～840 ℃;
6) carry out the laminar flow cooling: cooling termination temperature is controlled to be 580～680 ℃;
7) naturally cool to room temperature.
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| CN106906411A (en) * | 2017-03-27 | 2017-06-30 | 武钢集团昆明钢铁股份有限公司 | A kind of public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building and preparation method thereof |
| CN106906411B (en) * | 2017-03-27 | 2018-10-09 | 武钢集团昆明钢铁股份有限公司 | A kind of public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building and preparation method thereof |
| CN107574379A (en) * | 2017-09-23 | 2018-01-12 | 许昌学院 | A kind of high-earthquake-resistant building structural steel and its production technology |
| CN108728740A (en) * | 2018-04-28 | 2018-11-02 | 唐山钢铁集团有限责任公司 | A kind of low yield strength ratio rail truck hot rolled strip and its production method |
| CN108754335A (en) * | 2018-08-22 | 2018-11-06 | 武汉钢铁有限公司 | A kind of the welding structure fire-resistant and weather-resistant steel and production method of yield strength >=550MPa |
| CN108754335B (en) * | 2018-08-22 | 2019-09-10 | 武汉钢铁有限公司 | A kind of the welding structure fire-resistant and weather-resistant steel and production method of yield strength >=550MPa |
| CN112011736A (en) * | 2020-08-13 | 2020-12-01 | 北京科技大学 | Preparation method of rare earth-containing 460 MPa-level earthquake-resistant corrosion-resistant fire-resistant steel for buildings |
| CN112011736B (en) * | 2020-08-13 | 2021-11-09 | 北京科技大学 | Preparation method of rare earth-containing 460 MPa-level earthquake-resistant corrosion-resistant fire-resistant steel for buildings |
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