CN102605246A - Steel for low-strain-ageing sensitive welding structure and production method of steel - Google Patents
Steel for low-strain-ageing sensitive welding structure and production method of steel Download PDFInfo
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Abstract
The invention relates to steel for a low-strain-ageing sensitive welding structure with the yield ratio smaller than 0.8 and a production method of the steel. The steel consists of components including, by weight percentage, from 0.08 to 0.16% of C, from 0.15 to 0.50% of Si, from 1.02 to 1.80% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S, from 0.012 to 0.045% of Nb, from 0.005 to 0.032% of Ti, from 0.015 to 0.060% of Als, from 0.0015 to 0.008% of Ca, from 10 to 40X10-4% of [N], smaller than or equal 20X10-4% of [O] and smaller than or equal to 1.5X10-4% of [H], and the components meet the formulas including that 6.0C+Mn is larger than or equal to 1.95% and smaller than or equal to 2.3%, [N]+[O]+[H] is smaller than 50X10-4%, and P+S is smaller than or equal to 0.010%. The production method includes steps: smelting and desulfurizing; treating in a ladle; realizing vacuum treatment; continuously casting; heating and realizing high-pressure descaling for a casting blank; roughing; precisely rolling; realizing laminar cooling; and naturally cooling to reach room temperature. Low-strain-ageing sensitivity can be reduced to 20%, below 20% and even below 10% from existing 40%, and a seismic performance, namely the yield ratio ReL/Rm, is smaller than or equal to 0.80.
Description
Technical field
The present invention relates to welded construction engineering steel and method of manufacture thereof, specifically belong to yield tensile ratio less than 0.8 low strain aging sensitivity steel for welded structures and working method thereof.
Background technology
Before the present invention, the patent No. is that 200680010439.6 Chinese invention patent discloses a kind of hot-rolled steel sheet and method of manufacture and molded article formed from hot-rolled steel sheet, this invention steel C 0.01～0.2%, Si≤0.2%; Mn≤3.0%, P≤0.1%, S≤0.02%, Al≤0.1%; N≤0.02%, its P, S impurity content height, and tissue is a principal phase with martensite; Require the second phase ferritic area percentage between 1.0～30%, the armor plate strength rank is higher, has essential distinction with steel of the present invention.Other has the patent No. is that 200610124380.5 Chinese invention patent discloses a kind of low-temperature flexibility of steel plate and method of strain ageing low temperature tenacity improved; This invention steel C≤0.10%; P, S impurity content height; The armor plate strength rank is low, and yield tensile ratio is not paid attention to, the steel poor seismic behavior.Also having the patent No. is that 201110282948.7 Chinese invention patent discloses a kind of have-40 ℃ of strain aging ductility steel plates and working methods thereof, its C 0.09～0.13%, and Si 0.20～0.50%, and Mn 1.00～1.50%; P≤0.010%, S≤0.003%, N 0.002～0.005%, and Al 0.020～0.060%; Nb 0.03～0.05%, and Ti 0.007～0.020%, and Ni 0.20～0.45%; Cu 0.15～0.30%, and this steel contains more Cu, Ni element, and cost of alloy is high; And steel plate must carry out normalizing treatment, has increased the explained hereafter cost, and the armor plate strength rank is also lower.
The patent No. is that 200780043094.9 Chinese invention patent discloses a kind of low yielding ratio dual phase steel pipe line steel with good anti-strain aging property, its staple C 0.05～0.12%, and Nb 0.005～0.03%; Ti 0.005～0.02%, and N 0.001%～0.01%, and Mn 0.5～2.0%; Si 0.01～0.5%; Also contain valuable alloying elements such as Cu, Cr, Mo, Ni, but this steel contains more Mo, Cr, Cu, Ni, cost of alloy is high; Steel plate is organized as multiple compositions such as ferritic and perlite, martensite, lower bainite, granular bainite, upper bainite, carbide, organize complicated, extremely strict to processing requirement, in big production, be difficult to control; And yield tensile ratio is also higher, the steel poor seismic behavior.Also have Chinese patent 200780018634.8 to disclose the excellent effective steel pipe of high-strength line-pipe and effective steel plate of high-strength line-pipe and their method of manufacture of a kind of anti-strain aging property, its C0.03～0.07%, Si≤0.6%, Mn 1.7～2.5%; P≤0.015%, S≤0.003%, Al≤0.1%, Mo≤0.15%; Ti 0.005～0.03%, and N 0.001～0.006%, and B 0.0006～0.0025%, also contains Ni≤1.5%; Cu≤1.0%, one or more in Cr≤1.0%, the weak point of this invention steel is: valuable alloy content such as Mn, Mo, Cr, Cu, Ni is high; Other has added the hardening capacity element B, and speed of cooling is fast, so its tissue is the master control tissue with bainite and martensite; Intensity is higher, and yield tensile ratio is not paid attention to, and is different with steel of the present invention.
The patent No. is the method for manufacture that 201010251848.3 Chinese invention patent discloses a kind of high-grade large-strain pipeline steel and steel pipe, its C 0.04～0.08%, and Mn 1.50～1.90%, and Si 0.15～0.30%, P≤0.010%; S≤0.003%, Al 0.005～0.03%, and Ca 0.002～0.005%, N≤0.005%; Also contain Nb 0.01～0.06%, Ti 0.015～0.03%, and V 0.01～0.05%, and Mo 0.15～0.30%; Ni 0.15～0.30%, and Cu 0.15～0.30%, and Cr 0.15～0.30%, and B 0.001～0.005%; Re 0.03～0.05%, but this steel Mo, Cu, Cr, Ni content are high, and cost of alloy is high, must temper; And strain aging sensitivity coefficient only requires to be not more than 40%, and armor plate strength and yield tensile ratio are also higher, and in sum, this invention steel has essence different with steel of the present invention.Chinese invention patent 200910128934.2 discloses a kind of high-strength thick steel sheet and method of manufacture thereof of excellent in distortion aging property in addition, its composition C 0.10～0.16%, and Si 0.15～0.30%; Mn 1.30～1.60%, and Al 0.015～0.050%, and Cu 0.15～0.35%; Ni 0.10～0.30%, and Mo 0.10～0.25%, and V 0.030～0.050%; Nb 0.005～0.015%, and Ca 0.0005～0.005%, and N 0.002～0.008%; This invention Mo, Cu, Cr, Ni content are high, and 2 crystalline azimuth differencees are arranged is that the average equivalent circular diameter D of the crystal grain that surrounds of the big angle crystal boundary more than 15 ° is below the 35 μ m, and are more than the 50 area % according to the crystal orientation random grain boundary branch rate R that difference measures that distributes; Follow-uply also must carry out temper, therefore, this invention steel is alloy and technology cost height not only; And the production difficulty is very big, and it is all different with steel of the present invention to take all factors into consideration its chemical ingredients, production technique and intensity rank.
In recent years; High speed development and progress of science and technology along with domestic economy; A large amount of high-performance anti-seismic steel that use in great Steel Structure Works such as high-rise building, large bridge, factories and miness and stadiums; When reducing steel consumption, also attach great importance to the SF and the work-ing life of steel.
At present, domestic widely used high-performance steel still belong to the C-Mn steel, and this type steel through certain hour, seasoning will take place after implementing cold deformation, cause steel strength and yield tensile ratio to improve, and toughness descends.That is to say that after steel generation strain aging, the anti-seismic performance of steel descends, ductile-brittle transition temperature improves.At cold zone, if this moment, violent earthquake took place, Cold Brittle Fracture takes place in steel easily, causes building collapsing.And China is the selecting for use in the process of anti-seismic structure steel, and mainly the static strength with steel is design considerations, considers less to the variation of obdurability after the steel timeliness.Take place suddenly or unexpected brittle rupture for fear of steelwork; The steel of being selected for use must have enough toughness deposits under working conditions; Therefore, from the safety and the aspect consideration in work-ing life of Steel Structure Work, should the strain aging sensitivity of steel be included in the anti-seismic performance index of structure iron.
Can find out from the above-mentioned prior art of quoting,, all the yield tensile ratio (anti-seismic performance) of steel not paid attention to though the invention steel capital has certain distortion aging property; Cause inventing steel can't satisfy steel when taking into account strain aging anti-seismic performance requirement, and when representing with the impact value under the certain temperature, it is worth more than 100J; But can not explain to have good low temperature strain aging sensitivity, because compare with mother metal, it declines by a big margin; Sensitivity coefficient is higher; Be that distortion aging property is poor,, also only require to be not more than 40% even represent with sensitivity coefficient; The strict steelwork technical requirements that can not meet the demands of this value, alloy and technology cost are higher simultaneously.In order to improve distortion aging property, prior art all limits N content to some extent, but unqualified to O, H content; And O, H have very big influence to the performance of steel, and O can form a large amount of oxide inclusions in the steel, worsen the low-temperature impact toughness of steel; Simultaneously; These oxide compounds can become the forming core core of carbide, nitride etc., influence their distribution and size, further influence steel performance; H reduces the plasticity of steel in the steel, mainly shows to extend and the section contraction, and steel contains H and is prone to cause hydrogen embrittlement, belongs to strain aging type fragility, and brittle failure, main intercrystalline fracture promptly take place suddenly under stress; The increase of free N in the steel, the low-temperature flexibility of severe exacerbation welding zone, the responsive fragility of the low temperature strain aging of raising steel.Therefore; Take all factors into consideration the characteristic of steel of the present invention, except the content to N, O, H limits, also must limit its total amount; With the further low temperature strain aging sensitivity that improves steel; In conjunction with combining closely of special component and technology, produce the low strain aging sensitivity steel for welded structures of a kind of low-cost high-strength, to satisfy the demand of great Steel Structure Works such as modern large bridge, building, boats and ships, factories and miness.
Summary of the invention
The invention reside in and solve the deficiency that exists in the prior art; Provide a kind of low temperature strain aging sensitivity coefficient by existing 40% drop to 20% and below; Anti-seismic performance is yield tensile ratio ReL/Rm≤0.80, and has excellent low-temperature flexibility and welding property, and operation is simple; Production cost is low, also is easy to the low strain aging sensitivity steel for welded structures of HS and the working method thereof of scale operation.
Realize the measure of above-mentioned purpose:
A kind of low strain aging sensitivity steel for welded structures, its component and weight percent are: C:0.08～0.16%, Si:0.15～0.50%; Mn:1.02～1.80%, P≤0.010%, S≤0.005%; Nb:0.012～0.045%, Ti:0.005～0.032%, Als:0.015～0.060%; Ca:0.0015～0.008%, [N]: 10～40 * 10
-4%, [O]≤20 * 10
-4%, [H]≤1.5 * 10
-4%, all the other are Fe and unavoidable impurities;
And satisfy formula: 1.95%≤6.0C+Mn≤2.3%, [N]+[O]+[H]≤50 * 10
-4%, P+S≤0.010%.
It is characterized in that: also be added with following component and weight percent: Cr≤0.15% or Mo≤0.15% or Cu≤0.12% or its are compound, and satisfy Cr+Mo+Cu≤0.15%.
It is characterized in that:, add weight percent and be 0.12～0.25% Ni when the weight percent content of C during at 0.14%≤C≤0.16%.
Produce a kind of method of low strain aging sensitivity steel for welded structures, its step:
1) smelts and desulfurization, and control: the S in the molten steel≤0.002%, thickness of slag layer≤50 millimeter;
2) handle control ladle furnace slag oxidation iron level≤2% at ladle;
3) carry out vacuum-treat, the inclusion floating rate is controlled at 93% at least in the molten steel;
4) carry out continuous casting, and adopt the cast of Ar envelope whole process protection;
5) according to routine strand is heated and high pressure descaling;
6) carry out roughing, and control: its finishing temperature is at 1030～1080 ℃, and total draft is 60～75%, and the steel plate material thickness after rolling is by the control of (h+60) millimeter, and in the formula: h representes with the millimeter to be the steel sheet product one-tenth-value thickness 1/10 of unit;
7) carry out finish rolling, control: its start rolling temperature is controlled at (980-h) ± 5 ℃, and in the formula: h representes with the millimeter to be the steel sheet product one-tenth-value thickness 1/10 of unit;
8) carry out the laminar flow cooling, before the laminar flow cooling, earlier steel plate was shelved 6～15 seconds; After the cooling, again steel plate is shelved 10～20 seconds, and control its surface temperature of shelving the back steel plate at 600～780 ℃, the surface of steel plate temperature difference≤15 ℃;
9) 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 0.08～0.16%; 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; And when C content is lower than 0.08%, except causing the steel strength deficiency, also cause the raising of yield tensile ratio.Therefore, consider the over-all properties level of steel, the spy is defined as 0.08～0.16% with carbon content.
Si content of the present invention is chosen in 0.15～0.50%, and the main effect of Si in steel is solution strengthening and deoxidation.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 0.50% among the present invention.
Mn content of the present invention is chosen in 1.02～1.80%, and Mn guarantees steel strength and the indispensable element of toughness.But the Mn too high levels then can form more MnS inclusion, reduces the low temperature fracture toughness of steel, strengthens in length and breadth to performance difference.
Take all factors into consideration C and the Mn effect in steel, especially C and Mn disadvantageous effect to steel each item performance index, simultaneously in order to ensure the comprehensive mechanical performance level that satisfies steel requirement of the present invention, special 1.95%≤6.0C+Mn≤2.3% that limits.
P of the present invention≤0.010%, S≤0.005%, 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, has a strong impact on the strain aging of steel simultaneously.Be not more than 100 * 10 in order to ensure sulfide inclusion content in the steel
-4% further purifies steel and the comprehensive mechanical performance level that improves steel, and the special total amount that limits P, S in the steel is no more than 0.010%.
Nb content of the present invention is chosen in 0.012～0.045%; Nb is a kind of strong carbide forming element; Have the effect of intensive crystal grain thinning, can significantly improve austenite recrystallization temperature, enlarge the rolling technology scope; Effectively avoid the appearance of mixed grain structure, guarantee that steel have good obdurability coupling.The carbonitride particle that Nb forms in steel can effectively suppress growing up of austenite crystal, improves intensity and toughness, has reduced the content of free C, N in the steel simultaneously, reduces the strain aging sensitivity of steel.
Ti of the present invention is chosen in 0.005～0.032%, and Ti also is a kind of strong carbonitride forming element, through solid carbon and fixed nitrogen, reduces the influence of strain aging.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.Ti and Nb add simultaneously, can further improve the steel austenite recrystallization temperature, enlarge the rolling technology scope.But therefore the too high low-temperature flexibility that will reduce mother metal of Ti, is limited to 0.032% on the special qualification Ti.
Als content of the present invention is chosen in 0.015～0.060%, and Als usually adds in the steel as deoxidant element.N combines to form the AlN particle in Als and the steel, reduces the concentration of free N in the steel, reduces the strain aging sensitivity of steel, and intensity and low-temperature flexibility through grain refining effect raising steel.Als surpasses at 0.060% o'clock, is prone to cause that the inclusion of Al increases in the steel, reduces the purity of steel, worsens the low-temperature flexibility of steel.Therefore, consider the integrated performance index of steel, the spy is limited to 0.015～0.060% with Als content.
N content of the present invention is chosen in 10～40 * 10
-4%, elements such as Nb, Ti, Al, C form nitride or carbonitride in N and the steel, are the important elements that makes steel mother metal tissue and weld structure grain refining.For giving full play to the beneficial effect of N, N content must not be lower than 10 * 10
-4%.But when N content is excessive, will cause the increase of free N in the steel, the low-temperature flexibility of severe exacerbation welding zone particularly improves the responsive fragility of low temperature strain aging of steel, and therefore, the content of N need be 40 * 10
-4Below the %.
O and H belong to the obnoxious flavour in the steel, for guaranteeing the total amount of oxide inclusion in purity of steel and the steel, improve the low temperature strain aging sensitivity of steel, need O and the strictness of H content are limited in lower level.
Excessive N, O, H can produce adverse influence to steel in the steel of the present invention, and especially excessive N will have a strong impact on the low temperature strain aging toughness of steel, and O, H have very big influence to the performance of steel; O can form a large amount of oxide inclusions in the steel; Worsen the low-temperature impact toughness of steel, simultaneously, these oxide compounds can become the forming core core of carbide, nitride etc.; Influence their distribution and size, further influence steel performance; H reduces the plasticity of steel in the steel, mainly shows to extend and the section contraction, and steel contains the appearance that H is prone to cause white point and hydrogen embrittlement, and the latter belongs to strain aging type fragility, and brittle failure, main intercrystalline fracture promptly take place suddenly under stress.Above-mentioned 3 kinds of elements all influence the low-temperature impact toughness of steel, and then influence the low temperature distortion aging property of steel.In addition; The inventor outside taking all factors into consideration the fundamental property of steel of the present invention, seek out the welded construction High Strength Steel with excellent anti shock stability and low temperature distortion aging property of requirement of the present invention through a large amount of tests demonstration discovery repeatedly; Except the content to N, O, H in the steel limits; Also must limit its total amount, therefore, special [N]+[O]+[H]≤50 * 10 that limit of steel of the present invention
-4%.
Ca content of the present invention is chosen in 0.0015～0.008%, and Ca is a deoxidant element, also is the oxide compound forming element.Add proper C a in the steel with inclusion balling, make the inclusion refinement, help improving the low-temperature flexibility and the HAZ toughness of steel.But Ca content is lower than at 0.0015% o'clock, does not have due beneficial effect; And Ca content surpasses at 0.008% o'clock, then can form oxide compound and the sulfide inclusion of many large-scale Ca, worsens the over-all properties level of steel.
The present invention is when the weight percent content of C during at 0.14%≤C≤0.16%, also adds weight percent and be 0.12～0.25% Ni.Because Ni can effectively improve the low-temperature flexibility of steel, significantly reduce low temperature strain aging tendency, improve the strain aging low-temperature impact toughness of steel.When 0.14%≤C in the steel≤0.16%; Not only worsen plasticity, toughness and the welding property of steel; Also can increase the tendency of carbon segregation, improve strain aging sensitivity, the strain aging phenomenon that causes in order to improve in the steel dislocation interactions among the C and steel; Therefore add 0.12～0.25% Ni, have excellent low-temperature flexibility, welding property and distortion aging property to guarantee steel.
Cr of the present invention, Mo, Cu are owing to all have intensive solution strengthening effect, and for the over-all properties and the cost of alloy of balance steel, the spy limits Cr+Mo+Cu≤0.15%.But when total amount is too high, then not only can worsen the low-temperature flexibility of steel, also increase the production cost of steel.
For parameter control reason in the production technique:
At first control S content be not more than 0.002% and the control thickness of slag layer be not more than 50mm, in order to avoid bring converter into, under oxidizing atmosphere, cause sulphur content to go up.
At rough rolling step, and control: its finishing temperature is at 1030～1080 ℃, and total draft is 60～75%, and the steel plate material thickness after rolling is by the control of (h+60) millimeter, and in the formula: h representes with the millimeter to be the steel sheet product one-tenth-value thickness 1/10 of unit; In finish rolling, control: its start rolling temperature is controlled at (980-h) ± 5 ℃, and in the formula: h representes with the millimeter to be the steel sheet product one-tenth-value thickness 1/10 of unit; At the laminar flow colling stages, before the laminar flow cooling, earlier steel plate was shelved 6～15 seconds; After the cooling, again steel plate is shelved 10～20 seconds, and control its surface temperature of shelving the back steel plate at 600～780 ℃, the surface of steel plate temperature difference≤15 ℃.The bright steel of we is for the qualification reason of each parameter of rolling technology: roughing adopts high temperature to depress greatly; Total draft is controlled to be 60～75%; Finishing temperature is 1030～1080 ℃, and purpose is the fully refinement once more in order to ensure reduction in pass and austenite crystal, guarantees the low-temperature flexibility of steel; Steel plate material thickness after the roughing is by the control of (h+60) millimeter; In conjunction with finish rolling start rolling temperature (980-h) ± 5 ℃; Purpose is to have high rate that always presses down and the abundant refinement of ferrite crystal grain in order to ensure the finish rolling stage; Further improve armor plate strength and low-temperature flexibility,, thereby effectively improve the low temperature distortion aging property so that steel plate has excellent obdurability coupling and cold-forming property; According to the qualification of finish rolling start rolling temperature (980-h) ± 5 ℃, steel of the present invention need not limit the finish rolling finishing temperature, improves rolling efficiency greatly, has given full play to the production capacity potentiality of milling train.Steel plate is waited for 6～15 seconds before the laminar flow cooling, purpose mainly is that ferritic is fully separated out, and ferritic belongs to soft phase constitution; At ferritic and perlite is in the steel of master control tissue, and yield tensile ratio reduces with the increase of ferrite content, therefore; The soft phase constitution of enough ferritics must be arranged in the steel, otherwise cooling causes the refinement of crystal grain will improve the yield tensile ratio of steel fast; Thereby the yield tensile ratio that causes steel plate worsens the anti-seismic performance of steel greater than 0.80, is not more than 0.80 in order to ensure yield tensile ratio; The special steel plate that limits is waited for 6～15 seconds before the laminar flow cooling; Simultaneously also make full and uniformization of steel billet temperature, make cooling back steel plate internal and external temperature more even, further improve the low-temperature flexibility and the distortion aging property of steel plate; Laminar flow evenly cools off and stops back wait 10～20 seconds; Control steel plate surface temperature this moment is 600～780 ℃; The temperature difference is not more than 15 ℃, and purpose is the proportional distribution of the water yield up and down of water pipe when limiting the laminar flow cooling, guarantees the cooling of steel plate rapid and uniform; Thereby make naturally cooling more even, further guarantee comprehensive properties of rolled steel.
In addition; For making the abundant austenitizing of strand; Must above-mentioned strand be heated to more than 1250 ℃, what need particularly point out is that the heating rate of steel billet is 7～15min/cm, preferred 9～12min/cm; To improve the heating efficiency of steel billet, be unlikely to again to make steel billet crackle even fracture accident occur because of heating rate is too fast.Full and uniform in order to ensure the steel billet internal and external temperature; Steel billet must be incubated in 1160～1230 ℃ of TRs; Soaking time must not be lower than 30min, but the long austenite that will cause of soaking time is thick, thereby causes the finished product microstructure coarsening; Influence the comprehensive mechanical performance of steel, so soaking time must not be greater than 50min.For eliminating the billet surface iron scale as far as possible, the steel billet tapping temperature is controlled to be 1140～1180 ℃, carry out 1～2 sub-high pressure water de-scaling simultaneously, high pressure water pressure is 20～25MPa.
Find through inventor's TE demonstration; The strict steel plate of above-mentioned determinant and processing parameter production that adopts has good obdurability coupling, excellent welding property, anti-seismic performance and cold-forming property, particularly has excellent low temperature distortion aging property, therefore; The steel of the present invention that obtains need not to carry out any complicated heat treatment operation again; Technical process is more simple effectively, and production cost is low, all can implement at each smelter.
The present invention compared with prior art, the low temperature strain aging sensitivity by existing 40% drop to 20% and below in addition 10% below, anti-seismic performance is yield tensile ratio R
EL/ R
m≤0.80, have excellent low temperature distortion aging property, anti-seismic performance, low-temperature flexibility and welding property, and operation is simple, production cost is low, also 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 desulfurization, and control: the S in the molten steel≤0.002%, thickness of slag layer≤50 millimeter;
2) carry out ladle and handle, control ladle furnace slag oxidation iron level≤2%;
3) carry out vacuum-treat, the inclusion floating rate is controlled at 93% at least in the molten steel;
4) carry out continuous casting, and adopt the cast of Ar envelope whole process protection;
5) according to routine strand is heated and high pressure descaling
6) carry out roughing, and control: its finishing temperature is at 1030～1080 ℃, and total draft is 60～75%, and the steel plate material thickness after rolling is by the control of (h+60) millimeter, and in the formula: h representes with the millimeter to be the steel sheet product one-tenth-value thickness 1/10 of unit;
7) carry out finish rolling, control: its start rolling temperature is controlled at (980-h) ± 5 ℃, and in the formula: h representes with the millimeter to be the steel sheet product one-tenth-value thickness 1/10 of unit;
8) carry out the laminar flow cooling, before the laminar flow cooling, earlier steel plate was shelved 6～15 seconds; After the cooling, again steel plate is shelved 10～20 seconds, and control its surface temperature of shelving the back steel plate at 600～780 ℃, the surface of steel plate temperature difference≤15 ℃;
9) naturally cool to room temperature.
Each is implemented and the test detected result of Comparative Examples is seen table 3.
The chemical ingredients of each enforcement of table 1 and Comparative Examples and weight percent content tabulation
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
Through steel plate of the present invention being carried out normal temperature tensile property ,-20 ℃ of impact of collision tests; And with compared steel contrast, its result: under the normal temperature, the ys of steel of the present invention and compared steel are in same level; And tensile strength is higher slightly than compared steel, and steel yield tensile ratio (R of the present invention
EL/ R
m) all less than 0.80, comparative steel is then more than 0.82, this explanation steel of the present invention has more excellent anti-seismic performance; All more than 220J, far above compared steel, this explanation steel of the present invention has excellent low-temperature flexibility to steel of the present invention-20 ℃ following ballistic work.
Steel of the present invention belongs to low-alloy high-strength steel and makes the field, and like concrete regulation not, the residual strain amount that generally when the test strain aging sensitivity coefficient, adopts should be 5%, and residual strain amount that this test is adopted is 10%, requires more strict.TP: by the sampling of the regulation of GB/T2975 and be processed into the appearance base that stretches; Will be through sample after 10% the strain at 250 ± 10 ℃ of following even heating, and under this temperature, be incubated 1h, in air, be cooled to room temperature then; The regulation of pressing GB/T4160 is at last measured the strain aging sensitivity coefficient (Cv) of v-notch impact specimen, and test temperature is-20 ℃.Cv=(without the impact absorbing energy after the impact absorbing energy of strained timeliness-stand 10% strain and the artificial aging)/without impact absorbing energy * 100% of strained timeliness.Can be known that by table 3 experimental result the strain aging sensitivity coefficient of steel of the present invention is all below 20%, even be lower than 10%, comparative steel is then more than 35%, and obviously, steel of the present invention has more excellent low temperature distortion aging property.
In sum, steel of the present invention possesses good anti-seismic performance (R
EL/ R
m≤0.80), excellent low temperature distortion aging property, low-temperature flexibility and more excellent comprehensive mechanical property.Steel of the present invention is a non-hardened and tempered steel, has with low costly, and advantage such as manufacturing process is simple all can be implemented at each smelter, adaptable across requiring steel to have various Steel Structure Works such as good resistance shock stability and good low temperature distortion aging property.
Claims (4)
1. one kind low strain aging sensitivity steel for welded structures, its component and weight percent are: C:0.08～0.16%, Si:0.15～0.50%; Mn:1.02～1.80%, P≤0.010%, S≤0.005%; Nb:0.012～0.045%, Ti:0.005～0.032%, Als:0.015～0.060%; Ca:0.0015～0.008%, [N]: 10～40 * 10
-4%, [O]≤20 * 10
-4%, [H]≤1.5 * 10
-4%, all the other are Fe and unavoidable impurities;
And satisfy formula: 1.95%≤6.0C+Mn≤2.3%, [N]+[O]+[H]≤50 * 10
-4%, P+S≤0.010%.
2. a kind of low strain aging sensitivity steel for welded structures as claimed in claim 1; It is characterized in that: also be added with following component and weight percent: Cr≤0.15% or Mo≤0.15% or Cu≤0.12% or it is compound, and satisfy Cr+Mo+Cu≤0.15%.
3. a kind of low strain aging sensitivity steel for welded structures as claimed in claim 1 is characterized in that: when the weight percent content of C during at 0.14%≤C≤0.16%, add weight percent and be 0.12～0.25% Ni.
4. produce the method that aforesaid right requires 1 to 3 described a kind of low strain aging sensitivity steel for welded structures, its step:
1) smelts and desulfurization, and control: the S in the molten steel≤0.002%, thickness of slag layer≤50 millimeter;
2) handle control ladle furnace slag oxidation iron level≤2% at ladle;
3) carry out vacuum-treat, the inclusion floating rate is controlled at 93% at least in the molten steel;
4) carry out continuous casting, and adopt Ar envelope whole process protection cast;
5) according to routine strand is heated and high-pressure water descaling;
6) carry out roughing, and control: its finishing temperature is at 1030～1080 ℃, and total draft is 60～75%, and the steel plate material thickness after rolling is by the control of (h+60) millimeter, and in the formula: h representes with the millimeter to be the steel sheet product one-tenth-value thickness 1/10 of unit;
7) carry out finish rolling, control: its start rolling temperature is controlled at (980-h) ± 5 ℃, and in the formula: h representes with the millimeter to be the steel sheet product one-tenth-value thickness 1/10 of unit;
8) carry out the laminar flow cooling, before the laminar flow cooling, earlier steel plate was shelved 6～15 seconds; After the cooling, again steel plate is shelved 10～20 seconds, and control its surface temperature of shelving the back steel plate at 600～780 ℃, the surface of steel plate temperature difference≤15 ℃;
9) naturally cool to room temperature.
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| CN102876970A (en) * | 2012-09-21 | 2013-01-16 | 武汉钢铁(集团)公司 | Steel with yield strength larger than or equal to 390 MPa for high-rise buildings and production method of steel |
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| CN102876970A (en) * | 2012-09-21 | 2013-01-16 | 武汉钢铁(集团)公司 | Steel with yield strength larger than or equal to 390 MPa for high-rise buildings and production method of steel |
| CN102876970B (en) * | 2012-09-21 | 2014-06-18 | 武汉钢铁(集团)公司 | Steel with yield strength larger than or equal to 390 MPa for high-rise buildings and production method of steel |
| CN103602910A (en) * | 2013-10-22 | 2014-02-26 | 内蒙古包钢钢联股份有限公司 | Production method of low-cost and high-strength steel plate |
| CN104726773A (en) * | 2015-04-15 | 2015-06-24 | 武汉钢铁(集团)公司 | Normalizing-type high-strength pressure vessel steel plate with good low-temperature toughness at minus 50DEG C and manufacturing method of normalizing-type high-strength pressure vessel steel plate |
| CN109913629A (en) * | 2019-01-02 | 2019-06-21 | 武汉钢铁有限公司 | A kind of yield strength 630MPa grades of easy welding structure steels and preparation method thereof |
| CN110468336A (en) * | 2019-09-23 | 2019-11-19 | 包头钢铁（集团）有限责任公司 | A kind of low strain dynamic aging sensitivity steel for welded structures and its preparation process |
| CN111748737A (en) * | 2020-06-28 | 2020-10-09 | 武汉钢铁有限公司 | Easily-welded ultrahigh-strength steel with cold crack sensitivity coefficient less than or equal to 0.25 and production method thereof |
| CN111748737B (en) * | 2020-06-28 | 2021-10-22 | 武汉钢铁有限公司 | Easily-welded ultrahigh-strength steel with cold crack sensitivity coefficient less than or equal to 0.25 and production method thereof |
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