CN103882335B - A kind of yield strength 800MPa level hot-rolled high-strength steel and production method thereof - Google Patents
A kind of yield strength 800MPa level hot-rolled high-strength steel and production method thereof Download PDFInfo
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- CN103882335B CN103882335B CN201210563251.1A CN201210563251A CN103882335B CN 103882335 B CN103882335 B CN 103882335B CN 201210563251 A CN201210563251 A CN 201210563251A CN 103882335 B CN103882335 B CN 103882335B
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Abstract
The invention provides a kind of yield strength 800MPa level hot-rolled high-strength steel and production method thereof, the composition of this steel plate is as follows: C:0.04%～0.07%, Si:0.20%～0.30%, Mn:1.65%～1.85%, P:0～0.015%, S:0～0.003%, Ni:0.25% ~ 0.35%, Cr:0.20%～0.30%, Cu:0.20%～0.30%, Mo:0.20%～0.30%, Nb:0.05%～0.07%, Ti:0.010%～0.020%, Als:0.03%～0.06% remaining be Fe and inevitable impurity.Production method be strand reheat temperature be 1200～1250 DEG C, the finishing temperature of roughing is 1010～980 DEG C；Roughing treats after terminating that temperature carries out finish rolling to 930 DEG C～950 DEG C, and the finishing temperature of finish rolling is 830～805 DEG C；Roller repairing is divided into two stages: 1) first stage is quickly quenching into 300～150 DEG C with the cooling rate more than 20 DEG C/s；2) second stage is slowly cooled to room temperature with the cooling rate of 30 DEG C/h of ＜.This high strength steel steel has higher yield strength, plasticity, toughness and preferable welding performance；Eliminate and roll rear off-line heat treatment, reduce production cost.
Description
Technical field
The invention belongs to metal material field, particularly relate to a kind of yield strength be 800MPa level and have excellent toughness and
The hot-rolled high-strength steel of welding performance and production method thereof.
Background technology
Along with the development of World Economics, the pressure of resource, environment and the energy strengthens day by day, environmental protection and energy-conservation be increasingly subject to
The attention of steel industry.Exploitation there is energy-conservation, efficient, the long-lived and high strength steel of excellent performance, meet oil, coal, chemical industry,
Needing of the national economy key industry development such as electric power, traffic is also the steel and iron industry important channel that realizes sustainable development.
It is currently used for shipbuilding, pressure vessel, offshore platform, oil and natural gas feed-line, railway transportation and work
The high strength steels of industry such as journey machinery, do not need only have higher tensile strength and yield strength, and need good tough
Property and welding performance, it is further desirable that obtain this type of high strength steel under the conditions of relatively low manufacturing cost.The most a lot
Steel research personnel have been carried out the development of substantial amounts of high strength steel, and the main thought of these work is by suitable
Alloy design and rolling mill practice (and rolling after-baking), obtain preferable tissue morphology and Organization Matching, to reach high-strength
The combination property that degree steel is excellent.
Patent " a kind of high intensity and the processing side of ultrahigh-strength steel plates disclosed in Publication No. CN 101928873 A
Method ", use the alloy design of C-Mn-Cr-Ni-Nb-B, carry out preheating, quench and being tempered by induction heating method after hot rolling
Method produce yield strength be 710～1550MPa high-strength steel sheet.Patent disclosed in Publication No. CN 1390972 A
" ultrahigh-strength low-alloy steel ", uses the alloy design of C-Mn-Cr-Mo-V, after hot rolling by modifier treatment (quenching+high
Temperature tempering) process produce the high-strength steel sheet that yield strength is 797～1260MPa.
Although it is 800MPa level steel plate that above-mentioned patent can produce yield strength, but it is all to make use of at hot rolling+off-line heat
The method of reason (quenched, tempering etc.), therefore production cost is higher.In order to reduction production cost, Publication No. CN
Patent " high-strength steel sheet and manufacture method thereof " disclosed in 101932745 A, by hot rolling and roll rear self tempering process obtain
Yield strength is the automobile high-strength steel of 817MPa, but which employs higher carbon content (0.33%), higher silicone content
(1.52%) and higher Fe content (2.3%), its elongation percentage is 7.5%, and strength and ductility product (TS × EL) is 11408MPa.%.This steel
Carbon equivalent higher (Ceq=0.713), welding performance is poor.Additionally this patent does not provide low-temperature flexibility, but its higher carbon
Content and silicone content show that its low-temperature flexibility is the most poor.
Patent " hot-rolled super-strength martensitic steel and manufacture method thereof " disclosed in Publication No. CN 101041879A,
Providing and a kind of utilize hot rolling to produce the method that yield strength is 860MPa hot-rolled coil, but this high strength steel is by big merit
The coiling machine of rate uses ultralow temperature to batch after hot rolling and produces, and can only produce the hot-rolled coil that thickness is 1 4mm.
It can be seen that original technology utilizes hot rolling and rolls rear off-line heat-treating methods production 800MPa high strength steel,
Production cost is higher；Use the 800MPa level steel plate that the alloy design of higher carbon, high silicon and Gao Meng obtains, toughness and welding performance
Poor；And the method utilizing ultralow temperature to batch produces or Thin Specs hot-rolled coil, then need high-power coiling machine and can only give birth to
Produce Thin Specs roll bending.It is thus desirable to a kind of 800MPa level utilizing hot-rolling method production to have excellent toughness and welding performance is high-strength
The method of degree steel plate.
Summary of the invention
It is an object of the invention to overcome the problems referred to above and deficiency and provide a kind of yield strength is that 800MPa level hot rolling is high
Strength steel and production method thereof, this high strength steel not only has a higher yield strength, and have higher plasticity, toughness and
Preferably welding performance；Use and be cooled to 250～150 DEG C and the technique being slowly cooled to room temperature soon after rolling, eliminate and roll rear off-line
Heat treatment, reduces production cost.
The present invention is achieved in that the composition of this yield strength 800MPa level hot-rolled high-strength steel plate by weight percentage
Count as follows: C:0.04%～0.07%, Si:0.20%～0.30%, Mn:1.65%～1.85%, P:0～0.015%, S:0～
0.003%, Ni:0.25% ~ 0.35%, Cr:0.20%～0.30%, Cu:0.20%～0.30%, Mo:0.20%～0.30%, Nb:
0.05%～0.07%, Ti:0.010%～0.020%, Als:0.03%～0.06% remaining be Fe and inevitable impurity.
The present invention uses low C and low Si and adds the alloy design of Ni, Cr, Mo, Cu, Nb, Ti, significantly reduces steel
Carbon equivalent, not only contributes to low-temperature flexibility, and ensures that steel plate has preferable welding performance and low-temperature flexibility.
Present component design reason is as follows:
C: form interstitial solid solution in steel, play solution strengthening effect, the intensity of steel and with low cost can be significantly increased.
But carbon content is too high, unfavorable to low-temperature flexibility and welding performance.In the present invention, carbon content is 0.04%～0.07%.
Si: be deoxidant element when steel-making, play solution strengthening effect in steel, the intensity of steel can be significantly increased, but add
Entering and too much can damage the elongation percentage of steel, toughness and welding performance, the silicone content of the present invention is 0.20%～0.30%.
Mn: improve the quenching degree of steel, reduces the transition temperature of steel, has solution strengthening effect simultaneously.But Fe content is too much
Time on the one hand can produce segregation in strand heart portion, affect the uniformity of tissue after hot rolling, unfavorable to low-temperature flexibility, another aspect meeting
Make martensite transformation temperature decline, cause that room temperature texture has certain retained austenite, affect the intensity of steel.Due to manganese in steel
When content is higher, the segregation in strand heart portion can be increased the weight of and loosen.Fe content in the present invention is 1.65%～1.85%.
P: as the harmful element in steel, elongation percentage, low-temperature impact toughness and the welding performance of steel all being had infringement, it contains
Amount should control at reduced levels as far as possible.Therefore in the present invention, the content of P is≤0.015%.
S: as the harmful element in steel, the low-temperature flexibility of steel is had the biggest infringement.Sulfur forms sulfuration with manganese in steel
Manganese is mingled with, and not only affects the toughness of steel, elongation percentage, Z-direction performance, welding performance, but also can affect petroleum natural gas pipeline and use
Anti-hydrogen induced cracking (HIC) performance of steel.Its content should control at reduced levels as far as possible.Therefore in the present invention content of S be≤
0.003%.
Cr: increase the quenching degree of steel, the intensity of raising steel, but Cr too high levels, easily form the multiple carbon containing Cr in steel
Compound, although the intensity of steel and hardness improve, and but make the toughness of steel decline.Therefore in the present invention content of Cr be 0.20%～
0.30%。
Ni: improve quenching degree and reduce Cold Brittleness Transition Temperature.But Ni too high levels, not only makes cost of alloy increase, and
Martensite transformation temperature can be reduced, increase the ratio of twin crystal martensite and be unfavorable for the toughness of steel.Therefore the containing of Ni in the present invention
Amount is 0.25% ~ 0.35%.
Cu: be the anti-corrosion element of the one in steel, and solution strengthening effect can be played in steel.But for preventing it in steel
Causing hot-short, its content should be the not highest, and adds certain nickel.In the present invention, the content of Cu is 0.20%～0.30%.
Mo: in steel postpone pro-eutectoid ferrite change, increase steel quenching degree, crystal grain thinning, improve steel intensity and
Toughness.In the present invention, the content of Mo is 0.20%～0.30%.
Can significantly suppress the recrystallization of austenite, improve Austria Nb: the Nb(solid solution Nb in steel or strain induced precipitate Nb)
The recrystallization temperature of family name's body, makes hot rolling roll in recrystallization temperature interval and two temperature sections of non-recrystallization temperature range,
Microscopic structure by controlled rolling refinement steel.Changing Nb content in the present invention into is 0.05%～0.07%.
Ti: form carbide, nitride or carbonitride with C, the N in steel, suppression Austria when reheating and welding preheats
Growing up of family name's body crystal grain, crystal grain thinning, significantly improve armor plate strength, toughness and welding performance.Affine due to titanium and nitrogen in steel
Power is relatively strong, easily forms titanium nitride in steel, and therefore titanium also has the effect of fixed nitrogen, eliminates the free nitrogen in steel.But higher titanium
Content, can form thick titanium nitride in steel granular, affect intensity and the toughness of steel.Therefore in the present invention, the content of Ti is
0.010%～0.020%.
Yield strength 800MPa level hot-rolled high-strength steel production method of the present invention comprises the following steps: smelting → continuous casting → and again
Heating → roughing → treat temperature → finish rolling → cooling.It is characterized in that:
It is 1200～1250 DEG C that strand reheats temperature, promotes the abundant dissolving of the carbide of Nb, V in steel, is partly dissolved
Can effectively suppress growing up of austenite crystal containing Ti carbide.Temperature range at austenite recrystallization carries out roughing, roughing
Finishing temperature is 1010～980 DEG C, and austenite crystal is refined by passage by recrystallization；Roughing treats after terminating that temperature is to 930～950
Carrying out finish rolling in DEG C temperature range, the finishing temperature of finish rolling is 830～805 DEG C, at the non-recrystallization temperature of austenite～Ar3
Temperature range carries out finish rolling, though austenite does not occur recrystallization, but its shape becomes pie, there is substantial amounts of deformation inside it
Band, promotes structure refinement after phase transformation；Roller repairing is divided into two stages to cool down: 1) first stage is with the cooling rate more than 20 DEG C/s
It is quickly quenching into 300～150 DEG C, it is thus achieved that width is about the tiny martensite lath of 80～240nm；2) second stage is with ＜ 30
DEG C/cooling rate of h is slowly cooled to room temperature, and while making martensite produce, the martensite after phase transformation is carried out self tempering.
The basic ideas of the present invention: use low C and low Si and add the alloy design of Ni, Cr, Mo, Cu, Nb, Ti, using
Austenite recrystallization and non-recrystallization two-phase control rolling, roll after be quickly cooled to that Ms point is following and the technique of the room temperature of slow cooling, raw
Output yield strength is 800MPa level the high strength steel with good low-temperature toughness and welding performance.
Having the beneficial effects that of technical solution of the present invention: use thermo-mechanical rolling+direct quenching+self tempering technology, no
Need out-line quenching and or tempering, simplify production technology, reduce the production cost of steel；Use low C design and TMCP technique,
There is preferable low-temperature flexibility；Carbon equivalent is reduced to less than 0.51, and welding performance improves.In terms of implementation result, the height of the present invention
Strength steel sheet yield strength is 800～875MPa, and tensile strength is 960～1060MPa, and elongation percentage is 19～22% ,-20 DEG C of punchings
Hitting merit is 60～90J.
Accompanying drawing explanation
Fig. 1 is the microscopic structure of the embodiment of the present invention 1 steel plate.
Fig. 2 is the microscopic structure of the embodiment of the present invention 2 steel plate.
Fig. 3 is the microscopic structure of the embodiment of the present invention 3 steel plate.
Fig. 4 is the microscopic structure of the embodiment of the present invention 4 steel plate.
Fig. 5 is the microscopic structure of the embodiment of the present invention 5 steel plate.
Fig. 6 is the microscopic structure of the embodiment of the present invention 6 steel plate.
Detailed description of the invention
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention, according to the component proportion of technical scheme, carries out smelting and rolling.The change of embodiment of the present invention steel
Study and point be shown in Table 1.The main technologic parameters of embodiment of the present invention steel is shown in Table 2.The mechanical property of embodiment of the present invention steel is shown in Table 3.
The chemical composition (%) of table 1 embodiment
The main technologic parameters of table 2 embodiment steel
The mechanical property of table 3 embodiment steel
Claims (1)
1. a yield strength 800MPa level hot-rolled high-strength steel plate production method, including smelting, continuous casting, reheating, roughing, treats
Temperature, finish rolling, cooling, it is characterised in that: strand reheat temperature be 1200～1250 DEG C, the finishing temperature of roughing be 1010～
980℃；Roughing treats after terminating that temperature carries out finish rolling to 930 DEG C～950 DEG C, and the finishing temperature of finish rolling is 830～805 DEG C；Roll rear cold
But two stages it are divided into: 1) first stage is quickly quenching into 285～150 DEG C with the cooling rate more than 20 DEG C/s；2) second stage with
The cooling rate of 30 DEG C/h of ＜ is slowly cooled to room temperature；The composition of described steel plate is as follows: C:0.04%～
0.07%, Si:0.20%～0.30%, Mn:1.65%～1.79%, P:0～0.015%, S:0～0.003%, Ni:
0.25%～0.35%, Cr:0.20%～0.27%, Cu:0.20%～0.30%, Mo:0.20%～0.30%, Nb:
0.05%～0.07%, Ti:0.010%～0.020%, Als:0.03%～0.06% remaining be Fe and the most miscellaneous
Matter.
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| CN201210563251.1A CN103882335B (en) | 2012-12-21 | 2012-12-21 | A kind of yield strength 800MPa level hot-rolled high-strength steel and production method thereof |
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| CN103882335B true CN103882335B (en) | 2016-12-28 |
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| CN106191408B (en) * | 2016-08-12 | 2018-06-08 | 武汉钢铁有限公司 | A kind of yield strength 530MPa grades of Thin Specs Hot Rolling Automobile chassis beam steel and production method |
| CN114752850B (en) * | 2021-01-12 | 2023-03-14 | 宝山钢铁股份有限公司 | High-strength steel plate with yield strength of 785MPa and manufacturing method thereof |
| CN115537675B (en) * | 2022-09-15 | 2023-09-26 | 武汉钢铁有限公司 | 800 MPa-level surface-treatment-free commercial vehicle steel and production method thereof |
| CN116770198B (en) * | 2023-08-25 | 2023-11-03 | 张家港宏昌钢板有限公司 | Steel plate for low-compression-ratio hydropower and preparation method thereof |
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| DE4227154C2 (en) * | 1992-08-17 | 1996-02-15 | Benteler Werke Ag | Use of a steel as a material for pipes for reinforcing the side doors of passenger cars |
| CN1302144C (en) * | 2004-03-29 | 2007-02-28 | 宝山钢铁股份有限公司 | Superhigh strength thick steel plate capable of large-line energy welding and its manufacturing method |
| CN100434562C (en) * | 2005-11-30 | 2008-11-19 | 鞍钢股份有限公司 | Chromium-containing high-strength pipeline steel hot-rolled plate |
| CN101619423A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | Steel plate for high-strength high-toughness low-yield easily-welding structure and method for manufacturing same |
| CN101545079B (en) * | 2009-05-15 | 2011-09-21 | 首钢总公司 | X80 hot rolled steel plate with good toughness, high strength and low tensile ratio and production method thereof |
| CN101775561B (en) * | 2010-03-19 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | Low-yield-ratio and high strength thick plate and preparation process thereof |
| CN101942616B (en) * | 2010-09-15 | 2012-10-03 | 北京科技大学 | Bainite steel plate with high elongation, high strength and low carbon and production method thereof |
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