CN101956147A - High-strength low-crack sensitive slab and manufacture method thereof - Google Patents
High-strength low-crack sensitive slab and manufacture method thereof Download PDFInfo
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Abstract
The invention relates to a high-strength low-crack sensitive slab and a manufacture method thereof. The slab is prepared from the following chemical components in percentage by weight: 0.06-0.09 percent of C, 0.1-0.3 percent of Si, 1.35-1.55 percent of Mn, 0.02-0.04 percent of Nb, 0.02-0.04 percent of V, 0.01-0.02 percent of Ti, 0.15-0.25 percent of Ni, 0.1-0.2 percent of Cr, 0.15-0.25 percent of Cu, 0.02-0.04 percent of Al, not more than 0.006 percent of N, not more than 0.016 percent of P, less than 0.004 percent of S and the balance of Fe and impurities. The manufacture method of the high-strength low-crack sensitive slab comprises the following sequential steps of: heating a casting blank; descaling; controlling rolling; controlling cooling, straightening, and the like. The slab of the invention can reach the thickness of 80 mm, and the yield strength over 420 MPa and has excellent comprehensive mechanical performance, simple and convenient production process and low cost.
Description
Technical field
The present invention relates to a kind of High Strength Structural Steel and preparation technology thereof, be specifically related to a kind of thickness can reach 80mm, yield strength is in the high strength low-crackle sensitive slab and the manufacture method thereof of 420MPa level.
Background technology
In recent years, buildings develops to superelevation layer and large space direction always, for this reason, requires steel to have high strength and big cross section characteristic.Like this, requirement to mechanical property, welding property and the thickness of steel is also more and more higher, as, at present the performance of steel plate that Highrise buildings adopts generally need reach following standard: yield strength 〉=390MPa, yield tensile ratio≤0.85, Z (〉=the welding property of 40mm) becoming reconciled (can be born the input of bigger welding heat, for example 〉=50kJ/cm) to performance (relative reduction in area) 〉=15%, high low temperature (≤0 ℃) toughness, big thickness.
For this reason, industry is devoted to develop the High Strength Structural Steel that to meet above-mentioned performance requriements always.As, patent publication No. is that the patent of invention of CN101413087A has disclosed a kind of Highrise buildings steel plate and production method thereof.But this steel grade carbon content is higher, and the welding property of steel plate affects adversely; And for example, patent publication No. is that the patent of invention of CN101397625A has been put down in writing a kind of yield strength 420MPa level superfine grain steel sheet and manufacture method thereof, and this steel plate welding property is good, but is only applicable to be no more than the thick steel plate of 20mm, middle time of staying temperature is longer, influences rhythm of production.For another example, patent publication No. is the heat treating method that the patent of invention of CN101343685A discloses a kind of yield strength 420MPa grade high-strength steel plate for building, but this steel plate carbon content is higher, needs normalizing treatment, production technique cost height.
Summary of the invention
The objective of the invention is to propose a kind of high strength low-crackle sensitive slab and manufacture method thereof, this steel grade comprehensive mechanical property and welding property are good, and thickness is big, its preparation technology is simple and easy to do, controllability is good, and cost is low, thereby has overcome deficiency of the prior art.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of high strength low-crackle sensitive slab, it is characterized in that chemical ingredients that described slab comprises and weight percent thereof are: the Fe and the impurity element of C 0.06～0.09%, Si 0.1～0.3%, Mn 1.35～1.55%, Nb 0.02～0.04%, V 0.02～0.04%, Ti 0.01～0.02%, Ni 0.15～0.25%, Cr 0.1～0.2%, Cu 0.15～0.25%, Al 0.02～0.04%, N≤0.006%, P≤0.016%, S＜0.004% and surplus.
Say further: welding crack sensibility indices P cm≤0.19% of described slab, wherein, Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B.
Thickness≤the 80mm of described slab.
Described slab is after the overheated multi-run welding that is input as 50kJ/cm and 70kJ/cm, its heat affected zone summer of-40 ℃ than impacting toughness all greater than 70J.
The manufacture method of high strength low-crackle sensitive slab is characterized in that as mentioned above, and this method is:
Get with described slab and have the strand of identical chemical constitution after 1200 ℃ of insulations are handled 2 hours, carry out two stage rolling again, wherein fs roughing start rolling temperature is at 1050 ± 50 ℃, total reduction 〉=50%, subordinate phase finish rolling start rolling temperature is at 850～880 ℃, total reduction 〉=50%, after rolling promptly the speed of cooling with 9～12 ℃/s rolled piece is cooled to 470～580 ℃, through aligning, cooling, make target product again.
Particularly: strand is also handled through de-scaling after insulation is handled, and carries out two stage rolling again.
Described de-scaling is handled and is adopted high-pressure water descaling technology.
After the fs roughing was finished, rolled piece treated that on roller-way temperature to 850～880 ℃, then enters subordinate phase finish rolling.
Rolled piece is placed on the cold bed sky and is chilled to room temperature behind aligning, make target product.
This method specifically comprises the steps:
By the chemical constitution preparation raw materials for metallurgy of described slab, raw materials for metallurgy is handled through converter smelting, LF refining, RH vacuum outgas and continuous casting process successively, forms the continuously cast bloom of thickness more than 220mm;
Continuously cast bloom was handled 2 hours in 1200 ℃ of insulations, again it is carried out high-pressure water descaling and handle;
Continuously cast bloom is carried out two stage rolling, wherein the fs is a rough rolling step, subordinate phase is the finish rolling stage, the rough rolling step start rolling temperature is 1050 ± 50 ℃, total reduction 〉=50%, the rolled piece that roughing forms is treating to enter the finish rolling stage after temperature is to 850～880 ℃ on the roller-way, finish rolling stage total reduction 〉=50%, and the steel plate that rolls back formation enters the controlled chilling system immediately;
In the controlled chilling system, steel plate is handled, made its speed be cooled to 470～580 ℃ rapidly with 9～12 ℃/s with accelerated cooling device;
Steel plate is carried out straightening processing, then steel plate is placed on the cold bed sky and is chilled to room temperature, make target product.
In the above technological process,, can adopt a plurality of slabs simultaneously rolling according to the characteristics of production line in order to keep high efficiency production.
At deficiency of the prior art, this case contriver is through studying for a long period of time and putting into practice, the spy is developed and technical scheme of the present invention, promptly adopt low-carbon microalloyed composition design, by controlled rolling and controlled cooling technology, need not thermal treatment, prepare yield strength and reach the low-crackle sensitive slab that 420MPa level, thickness can reach 80mm, its performance index satisfy the demand of modern building.
Below the effect of contained component among the present invention and consumption are selected to specify:
C: be to guarantee the necessary element of armor plate strength.Being lower than 0.03% can not proof strength, is higher than 0.10% base metal tenacity and HAZ toughness and reduces.Therefore C content is chosen in 0.06%～0.09%.
Si: in steel, play the solution strengthening effect, improve the intensity of steel plate, but damage its low-temperature flexibility and welding property.Therefore the content of Si is controlled in 0.1%～0.3% the scope.
Mn: improve the hardening capacity of steel, and play the effect of solution strengthening and refinement ferrite crystal grain.When being lower than 0.8%, can't give full play to the effect that intensity is guaranteed.When being higher than 2.0%, base metal tenacity and HAZ toughness reduce.Therefore Mn content is chosen in 1.35%～1.55%.
Ni: be a kind of element that improves hardening capacity and help to improve low-temperature flexibility.But if interpolation is excessive, then base metal tenacity and HAZ toughness have the trend of reduction.Simultaneously Ni also is a noble metal, so its content is controlled at 0.15%～0.25%, helps the cost performance that reaches optimum.
Cr: can significantly improve the hardening capacity of steel and help intensity to improve.But if interpolation is excessive, then base metal tenacity and HAZ toughness reduce, so its content is controlled at 0.1%～0.2%.
Cu: the hardening capacity and the resistance to atmospheric corrosion that can improve steel plate.But too high Cu content easily makes steel produce the copper brittleness phenomenon, worsens the surface property of steel plate.Therefore its content is controlled at 0.15%～0.25%.
Nb: be the important element in the rolling controlled and cooling controlled steel, its adding can stop the recrystallize behind the austenite deformation, improves austenite recrystallization temperature.But if excessively add Nb, then base metal tenacity and HAZ toughness reduce.Therefore its content is controlled at 0.02%～0.04%.
V: be to make V (C, the element of N) separating out can improve the intensity of steel plate.But if interpolation is excessive, then base metal tenacity and HAZ toughness reduce, so its content is controlled at 0.02%～0.04%.
It is fixed nitrogen and deoxidation that Ti, Al mainly act on.Ti/N is advisable between 2.5～3.5.Ti is the also stable tissue of heating once more except the precipitation strength effect, but its too high levels can make the toughness of steel descend.Al is deoxidation effectively, but too high levels can be damaged the toughness of steel.
P: bring adverse influence can for the toughness of mother metal and the toughness of HAZ as impurity element, so its content should lack as much as possible, its content is controlled at and is not more than 0.016%.
S: be to form MnS and element that ductility is reduced.For the Z that guarantees slab to performance, its content is controlled at less than 0.004%.
The metallographic structure of the slab that employing mentioned component and technology are obtained is acicular ferrite, bainite and perlite.Its tensile strength reaches 560～605MPa, the yield strength of steel plate also can reach 420MPa when thickness 80mm, yield tensile ratio≤0.82, unit elongation 24～30% ,-40 ℃ of ballistic works be greater than 200J, Z to relative reduction in area greater than 60%, anti-cold-bending property is good, welding property is good, its carbon equivalent Ceq≤0.37, Pcm≤0.19.
Compared with prior art, the present invention has following beneficial effect at least:
(1) goes up according to the low-carbon microalloy principle from the composition design.By adding Nb, improve austenite recrystallization and stop temperature, can make steel plate be difficult for growing up at high temperature rolling crystal grain, reduce rolling load, improve the efficient of milling train.Utilize the high-temperature stability of the titanium niobium carboritride of TiN and other, the pinning crystal boundary, the growing up fast of austenite crystal when stoping heating when guaranteeing armor plate strength, improved the toughness and the weldability of steel plate.
(2) rolling technology adopts the controlled rolling of two stages, and control deepfreeze after rolling the finishing immediately, need not online heat treatment step, can also adopt simultaneously a plurality of slabs simultaneously rolling according to the characteristics of production line, so the production efficiency height, and the room temperature texture of the target product steel plate that forms is acicular ferrite, bainite and perlite.The acicular ferrite of a large amount of high dislocation densities improves the low-temperature flexibility of steel plate effectively when guaranteeing armor plate strength.
(3) slab interalloy constituent content of the present invention is low, and noble element is few, and production process reduces compared to prior art, and cost reduces greatly.
Description of drawings
Fig. 1 is the metallographic structure photo of high strength low-crackle sensitive slab in the embodiment of the invention 1;
Fig. 2 is the metallographic structure photo of high strength low-crackle sensitive slab in the embodiment of the invention 2;
Fig. 3 is the metallographic structure photo of high strength low-crackle sensitive slab in the embodiment of the invention 3;
Fig. 4 is the metallographic structure photo of high strength low-crackle sensitive slab in the embodiment of the invention 4;
Fig. 5 is the metallographic structure photo of high strength low-crackle sensitive slab in the embodiment of the invention 5.
Specific embodiments
For a more detailed description below in conjunction with preferred embodiment of the present invention and accompanying drawing to technical scheme of the present invention.But these embodiment only are the descriptions to better embodiment of the present invention, and can not produce any restriction to scope of the present invention.
Embodiment 1
Composition and weight percent thereof that this high strength low-crackle sensitive slab is comprised are: C 0.06%, Si0.24%, Mn 1.42%, P 0.016%, S 0.0013%, Cr 0.11%, Ni 0.18%, Al 0.04%, Cu 0.19%, Nb 0.03%, Ti 0.015%, V 0.03%, N 0.0033, surplus is iron and unavoidable impurities element.
The production technique of this high strength low-crackle sensitive slab is as follows:
Chemical constitution configuration raw materials for metallurgy by above-mentioned slab carries out converter smelting-LF refining-RH vacuum outgas-continuous casting-continuously cast bloom (thickness is 220mm)-heating (insulation is handled)-high-pressure water descaling-controlled rolling, the cold-aligning-air cooling of control successively to room temperature-finished product.
Say that further the concrete technology in above-mentioned insulation processing, controlled rolling, cold stage of control is:
Continuously cast bloom is heated to 1200 ℃ of insulations 2 hours, promptly carries out two stage rolling again behind high-pressure water descaling, fs roughing start rolling temperature is 1041 ℃, the thick 100mm of intermediate blank; Subordinate phase finish rolling start rolling temperature is 880 ℃, final thickness of slab 40mm; Air cooling after being cooled to 580 ℃ with the speed of cooling of 9 ℃/s immediately after rolling.
Via the finished product that above-mentioned production technique forms, i.e. the metallographic structure of high strength low-crackle sensitive slab is acicular ferrite, bainite and perlite (as shown in Figure 1), and its mechanical property sees Table 1.
Embodiment 2
Composition and weight percent thereof that this high strength low-crackle sensitive slab is comprised are: C 0.06%, Si0.19%, Mn 1.47%, P 0.008%, S 0.0023%, Cr 0.11%, Ni 0.18%, Al 0.04%, Cu 0.18%, Nb 0.03%, Ti 0.013%, V 0.03%, N 0.0044, surplus is iron and unavoidable impurities element.
The production technique of this 420MPa level low-crackle sensitive slab is substantially the same manner as Example 1, but its controlled rolling, the control the cold stage technology there are differences, specific as follows:
In two stage rolling operations, stage roughing start rolling temperature is 1016 ℃, the thick 120mm of intermediate blank; Two-stage finish rolling start rolling temperature is 859 ℃, final thickness of slab 50mm; Be cooled to air cooling after 521 ℃ of the temperature with the speed of cooling of 11 ℃/s immediately after rolling.
Via the finished product that above-mentioned production technique forms, i.e. the metallographic structure of high strength low-crackle sensitive slab is acicular ferrite, bainite and perlite (as shown in Figure 2), and its mechanical property is as shown in table 1.
Embodiment 3
Composition and weight percent thereof that this high strength low-crackle sensitive slab is comprised are: C 0.07%, Si0.21%, Mn 1.35%, P 0.016%, S 0.0018%, Cr 0.14%, Ni 0.18%, Al 0.04%, Cu 0.18%, Nb 0.03%, Ti 0.015%, V 0.03%, N 0.0027, surplus is iron and unavoidable impurities element.
The production technique of this high strength low-crackle sensitive slab is as follows:
Chemical constitution configuration raw materials for metallurgy by above-mentioned slab carries out converter smelting-LF refining-RH vacuum outgas-continuous casting-continuously cast bloom (thickness is 320mm)-heating (insulation is handled)-high-pressure water descaling-controlled rolling, the cold-aligning-air cooling of control successively to room temperature-finished product.
Say that further the concrete technology in above-mentioned insulation processing, controlled rolling, cold stage of control is:
Continuously cast bloom is heated to 1200 ℃ of insulations 2 hours, promptly carries out two stage rolling again behind high-pressure water descaling, stage roughing start rolling temperature is 1095 ℃, the thick 100mm of intermediate blank; Two-stage finish rolling start rolling temperature is 873 ℃, final thickness of slab 50mm; Air cooling after being cooled to 470 ℃ with the speed of cooling of 10 ℃/s immediately after rolling.
Via the finished product that above-mentioned production technique forms, i.e. the metallographic structure of high strength low-crackle sensitive slab is acicular ferrite, bainite and perlite (as shown in Figure 3), and its mechanical property sees Table 1.
Embodiment 4
Composition and weight percent thereof that this high strength low-crackle sensitive slab is comprised are: C 0.09%, Si0.22%, Mn 1.35%, P 0.01%, S 0.0024%, Cr 0.12%, Ni 0.19%, Al 0.04%, Cu0.17%, Nb 0.03%, Ti 0.016%, V 0.03%, N 0.0033, surplus is iron and unavoidable impurities element.
The preparation technology of this high strength low-crackle sensitive slab is substantially the same manner as Example 3, but its controlled rolling, the control the cold stage technology there are differences, specific as follows:
The continuously cast bloom that 320mm is thick is heated to 1200 ℃ of insulations 2 hours, behind high-pressure water descaling, carries out two stage rolling, and wherein, stage roughing start rolling temperature is 1052 ℃, the thick 130mm of intermediate blank; Two-stage finish rolling start rolling temperature is 860 ℃, final thickness of slab 60mm; Air cooling after being cooled to 511 ℃ with the speed of cooling of 10 ℃/s immediately after rolling.
Via the finished product that above-mentioned production technique forms, i.e. the metallographic structure of high strength low-crackle sensitive slab is acicular ferrite, bainite and perlite (as shown in Figure 4), and its mechanical property sees Table 1.
Embodiment 5
The chemical constitution and the preparation technology of present embodiment high strength low-crackle sensitive slab are substantially the same manner as Example 3, but its controlled rolling, the control the cold stage technology there are differences, specific as follows:
In two stage rolling operations, stage roughing start rolling temperature is 1063 ℃, the thick 140mm of intermediate blank; Two-stage finish rolling start rolling temperature is 857 ℃, final thickness of slab 80mm; After rolling immediately with the speed of cooling of 12 ℃/s be cooled to temperature be 524 ℃ after air cooling.
Via the finished product that above-mentioned production technique forms, i.e. the metallographic structure of high strength low-crackle sensitive slab is ferrite, acicular ferrite, bainite and perlite (as shown in Figure 5), and its mechanical property sees Table 1.
The comprehensive mechanical property of table 1 embodiment 1-5 high strength low-crackle sensitive slab
The above only is in order to explain the present invention's preferred embodiment; be not that the attempt tool is to do any formal restriction to the present invention; be with, all have in following any modification or change of doing relevant the present invention of identical invention spirit, all must be included in the category that the invention is intended to protection.
Claims (10)
1. high strength low-crackle sensitive slab, it is characterized in that chemical ingredients that described slab comprises and weight percent thereof are: the Fe and the impurity element of C 0.06～0.09%, Si 0.1～0.3%, Mn 1.35～1.55%, Nb 0.02～0.04%, V 0.02～0.04%, Ti 0.01～0.02%, Ni 0.15～0.25%, Cr 0.1～0.2%, Cu 0.15～0.25%, Al 0.02～0.04%, N≤0.006%, P≤0.016%, S＜0.004% and surplus.
2. high strength low-crackle sensitive slab according to claim 1, it is characterized in that: the yield strength of described slab is more than 420MPa, its welding crack sensibility indices P cm≤0.19%, wherein, Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B.
3. high strength low-crackle sensitive slab according to claim 1 and 2 is characterized in that: the thickness≤80mm of described slab.
4. high strength low-crackle sensitive slab according to claim 1 and 2 is characterized in that: described slab is after the multi-run welding of overheated 50kJ/cm of being input as and 70kJ/cm, and toughness is impacted all greater than 70J at-40 ℃ summer ratio in its heat affected zone.
5. the manufacture method of high strength low-crackle sensitive slab according to claim 1 is characterized in that this method is:
Get with described slab and have the strand of identical chemical constitution after 1200 ℃ of insulations are handled 2 hours, carry out two stage rolling again, wherein fs roughing start rolling temperature is at 1050 ± 50 ℃, total reduction 〉=50%, subordinate phase finish rolling start rolling temperature is at 850～880 ℃, total reduction 〉=50%, after rolling promptly the speed of cooling with 9～12 ℃/s rolled piece is cooled to 470～580 ℃, through aligning, cooling, make target product again.
6. the manufacture method of high strength low-crackle sensitive slab as claimed in claim 5 is characterized in that: strand is also handled through de-scaling after insulation is handled, and carries out two stage rolling again.
7. the manufacture method of high strength low-crackle sensitive slab as claimed in claim 6 is characterized in that: described de-scaling is handled and is adopted high-pressure water descaling technology.
8. the manufacture method of high strength low-crackle sensitive slab as claimed in claim 5 is characterized in that: after the fs roughing was finished, rolled piece treated that on roller-way temperature to 850～880 ℃, then enters subordinate phase finish rolling.
9. the manufacture method of high strength low-crackle sensitive slab as claimed in claim 5 is characterized in that: rolled piece is placed on the cold bed sky and is chilled to room temperature behind aligning, make target product.
10. the manufacture method of high strength low-crackle sensitive slab as claimed in claim 5 is characterized in that this method specifically comprises the steps:
By the chemical constitution preparation raw materials for metallurgy of described slab, raw materials for metallurgy is handled through converter smelting, LF refining, RH vacuum outgas and continuous casting process successively, forms the continuously cast bloom of thickness more than 220mm;
Continuously cast bloom was handled 2 hours in 1200 ℃ of insulations, again it is carried out high-pressure water descaling and handle;
Continuously cast bloom is carried out two stage rolling, wherein the fs is a rough rolling step, subordinate phase is the finish rolling stage, the rough rolling step start rolling temperature is 1050 ± 50 ℃, total reduction 〉=50%, the rolled piece that roughing forms is treating to enter the finish rolling stage after temperature is to 850～880 ℃ on the roller-way, finish rolling stage total reduction 〉=50%, and the steel plate that rolls back formation enters the controlled chilling system immediately;
In the controlled chilling system, steel plate is handled, made its speed be cooled to 470～580 ℃ rapidly with 9～12 ℃/s with accelerated cooling device;
Steel plate is carried out straightening processing, then steel plate is placed on the cold bed sky and is chilled to room temperature, make target product.
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| CN102409234A (en) * | 2011-11-14 | 2012-04-11 | 南京钢铁股份有限公司 | Method for manufacturing 355MPa grade low alloy steel plate with welding crack sensitivity index less than 0.23 |
| CN103667915A (en) * | 2013-08-02 | 2014-03-26 | 重庆钢铁(集团)有限责任公司 | Thermal mechanical control steel plate having favorable low-temperature flexibility and manufacturing method thereof |
| CN112813340A (en) * | 2020-06-18 | 2021-05-18 | 宝钢湛江钢铁有限公司 | Steel plate with excellent impact fracture resistance and manufacturing method thereof |
| RU2792549C1 (en) * | 2022-06-01 | 2023-03-22 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Method for the production of cold-resistant rolled steel sheet |
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| CN102181792A (en) * | 2011-04-01 | 2011-09-14 | 江苏省沙钢钢铁研究院有限公司 | Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof |
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| CN103667915A (en) * | 2013-08-02 | 2014-03-26 | 重庆钢铁(集团)有限责任公司 | Thermal mechanical control steel plate having favorable low-temperature flexibility and manufacturing method thereof |
| CN112813340A (en) * | 2020-06-18 | 2021-05-18 | 宝钢湛江钢铁有限公司 | Steel plate with excellent impact fracture resistance and manufacturing method thereof |
| CN112813340B (en) * | 2020-06-18 | 2022-07-05 | 宝钢湛江钢铁有限公司 | Steel plate with excellent impact fracture resistance and manufacturing method thereof |
| RU2792549C1 (en) * | 2022-06-01 | 2023-03-22 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Method for the production of cold-resistant rolled steel sheet |
| RU2815949C1 (en) * | 2023-08-09 | 2024-03-25 | Публичное акционерное общество "Северсталь" (ПАО "Северсталь") | Method of producing hot-rolled sheets from low-alloy steel |
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