CN105039866A - 1400 MPa super-high strength alloy steel and manufacturing method thereof - Google Patents
1400 MPa super-high strength alloy steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of smelting and particularly relates to 1400 MPa super-high strength alloy steel and a manufacturing method thereof. The 1400 MPa super-high strength alloy steel is characterized by comprising 0.18-0.25% of C, 0.40-0.65% of Si, 1.10-1.40% of Mn, not greater than 0.009% of P, not greater than 0.002% of S, 0.30-0.80% of Cr, 0.20-0.60% of Ni, 0.20-0.60% of Mo, 0.008-0.0025% of B, 0.020-0.035% of Ti and balance Fe and inevitable impurities. The 6-60 mm super-high strength alloy steel plates produced through the method is great in strength and toughness matching and good in impact toughness at the low temperature of -40 DEG C. By controlling rolling, quenching and temper heat treatment, the metallographic phase mainly is tempered martensite organizations, the strength of extension is higher than 1400 Mpa, the yield strength is higher than 1170 Mpa, the transverse low temperature ballistic work at -40 DEG C is larger than 50 J, the surface brinell hardness is larger than 430 HBW, and the surface residual magnetization is less than 15 GS.
Description
Technical field
The invention belongs to technical field of smelting, be specifically related to a kind of 1400MPa level and surpass high-strength alloy steel and manufacture method thereof.
Background technology
In recent years, the manufacture of many large-scale defence engineering equipments gets more and more to the use of the strong alloy steel plate of 1400MPa level superelevation, the past great majority Q960 level steel plate meeting GB/T16270, its yield strength is greater than 960MPa, tensile strength is interval at 980-1150MPa, intensity can not meet superstrength requirement far away, and requires that steel plate has lower surface remanence and high-wearing feature in manufacture and use procedure.Therefore in the urgent need to developing the strong alloy steel plate of 1400MPa level superelevation of better, the easy welding of high and low temperature impelling strength of a kind of intensity, low residual induction, high rigidity.
CN102286687A discloses " manufacture method of high-strength plate Q960 produced by a kind of Steckel mill ", it is characterized in that the method comprises the following steps:
1) in smelting technology, adopt converter steelmaking, push up the dark decarburization of low top-bottom blowing; RH vacuum-treat is adopted to enter
One step decarburization, and carry out microalloying, obtain satisfactory steel billet; The chemical component weight per-cent of steel billet is: C
0.12 ~ 0.20%, Mn0.80 ~ 1.60%, Si0.02 ~ 0.40, P≤0.015, S≤0.005, B0.001 ~ 0.003, and add
Add appropriate Cr, Mo, V, Ni alloying element, and meet carbon equivalent Ceq=+Mn/6+Cr/5+Mo/4+V/14+Ni/40+Si/24≤0.60;
2) in rolling technology, Steckel mill is adopted to carry out controlled rolling, to roll front billet heating temperature be 1150 ~
1250 DEG C, reduction per pass is 10 ~ 25%, and pressure temperature is 900 ~ 1200 DEG C, and coiler furnace temperature is < 1000 DEG C.
The high-strength plate Q960 that above-mentioned method is produced, its yield strength is at more than 960Mpa, the requirement of more high strength can not be met, therefore, need to improve existing steel plate rolling technique, produce the strong alloy steel plate of 1400MPa level superelevation of better, the easy welding of high and low temperature impelling strength of a kind of intensity, low residual induction, high rigidity.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention adopts hot metal pretreatment, vacuum deaeration refining, controlled rolling technology, the strong alloy steel plate of Q-tempering manufacture technics 6-60mm specification 1400MPa level superelevation, meets the requirement of defence equipment manufacture to the strong low magnetic-type steel alloy of superelevation.
The present invention is directed to China's national defense equipment ultra-high strength steel plate technical market demand, improve low level steel Q960 intensity and wear resistance skill target deficiency, adopt low P, S, Mo, Cr, Ni, B alloy designs, utilize converter to smelt fast, through LF external refining and the degassed refining of RH, improve Molten Steel Cleanliness, a kind of method improving armor plate strength, low-temperature impact toughness through controlled rolling, Quench and temper technology is provided, obtains tempered martensite metallographic structure.
Main component of the present invention: C:0.18-0.25%; Si:0.40-0.65%; Mn:1.10-1.40%; P≤0.009%; S≤0.002%; Cr:0.30-0.80%; Ni:0.20-0.60%; Mo:0.20-0.60%; B:0.0008-0.0025%; Ti:0.020-0.035%; All the other are Fe and inevitable impurity.
In above-mentioned composition, its Cr+Ni+Mo total content >=0.70%.
Processing step of the present invention comprises:
KR hot metal pretreatment; Converter smelting; LF external refining; RH vacuum outgas; Heating of plate blank; Roughing; Finish rolling; Q-tempering.
Be specially following step:
KR hot metal pretreatment → converter smelting → deoxidation alloying → CAS → LF refining → RH → CCM → cutting scale inspection → casting blank stacking slow cooling 48 hours → strand heating → high-pressure water descaling → roughing → finish rolling → aligning → ball blast → quenching → tempering → aligning → cutting, sampling → inspection → finished product.
Step is as follows more specifically:
(1) KR hot metal pretreatment: S content controls lower than 0.002%;
(2) converter smelting: BOF oxygen argon gas top and bottom complex blowing takes off C, adopts the pushing off the slag of hydraulic pressure slide plate;
(3) LF external refining: heat-up time 15-18 minute;
(4) RH vacuum outgas: process 20 minutes, argon gas soft blow 10-12 minute after line feeding under being less than 200Pa vacuum tightness;
(5) heating of plate blank: soaking temperature range 1180-1200 DEG C, soaking time scope 3.8-4.0 hour;
(6) roughing: start rolling temperature 1020-1050 DEG C;
(7) finish rolling: start rolling temperature scope 980-1000 DEG C, finishing temperature scope 840-850 DEG C, high pressure water sprays 1-3 time, thinning scale on surface;
(8) quench: Heating temperature 890-910 DEG C, cooling by water velocity range 20-35 DEG C/s.Form the sub-alloy of high-density, obtain the martensitic microstructure of fine uniform;
(9) tempering: 200-280 DEG C of tempering 180-200 minute.
Compared with the Q960 production method in background technology, adopt the present invention to produce the strong alloy steel plate of 6-60mm superelevation, reach excellent obdurability coupling ,-40 DEG C of low-temperature impact toughness are excellent.By controlled rolling, quenching and tempering thermal treatment, metallographic is mainly tempered martensite, tensile strength > 1400MPa, yield strength > 1170MPa,-40 DEG C of horizontal low-temperature impact work > 50J, surface Brinell hardness > 430HBW, surface remanence < 15GS.Its intensity of steel plate of the present invention better, the easy welding of high and low temperature impelling strength, low residual induction, 1400Mpa grade super strength can be reached.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described, so that those skilled in the art more understands the present invention, but does not therefore limit the present invention.
Embodiment 1
Slab melting composition is:
C:0.18%; Si:0.45%; Mn:1.30%; P:0.008%; S:0.002%; Cr:0.55%; Ni:0.45%; Mo:0.25%; B:0.0012%; Ti:0.023%, Cr+Ni+Mo:1.25%, all the other are Fe and inevitable impurity.
Slab soaking temperature (DEG C): 1180; Soaking time (hour): 3.9; Roughing temperature (DEG C): 1030; Finish rolling start rolling temperature (DEG C): 980; Finish rolling finishing temperature (DEG C): 840; High pressure water sprays number of times (secondary): 3; Quenching temperature (DEG C): 900; Speed of cooling (DEG C/s): 32; Tempering temperature (DEG C): 255, tempering time (minute): 185;
Its detailed step is as follows:
(1) KR hot metal pretreatment: S content controls lower than 0.002%;
(2) converter smelting: BOF oxygen argon gas top and bottom complex blowing takes off C, adopts the pushing off the slag of hydraulic pressure slide plate;
(3) LF external refining: about 16 minutes heat-up time;
(4) RH vacuum outgas: process 20 minutes, argon gas soft blow about 10 minutes after line feeding under being less than 200Pa vacuum tightness;
(5) heating of plate blank: soaking temperature range 1180 DEG C, soaking time scope 3.9 hours;
(6) roughing: start rolling temperature 1030 DEG C;
(7) finish rolling: start rolling temperature scope 980 DEG C, finishing temperature scope 840 DEG C, high pressure water sprays 3 times, thinning scale on surface;
(8) quench: Heating temperature 900 DEG C, cooling by water velocity range 32 DEG C/s.Form the sub-alloy of high-density, obtain the martensitic microstructure of fine uniform;
(9) tempering: 255 DEG C of tempering 185 minutes.
Plate property:
Specification: steel plate thickness 6mm; Yield strength (MPa): 1180; Tensile strength (MPa): 1490; Elongation after fracture (%): 17; V-type transverse impact merit (-40 DEG C): 55J, 58J, 60J(specimen size 5 × 10 × 55mm); Surface Brinell hardness (HBW): 450; Surface of steel plate remanent magnetism (GS): 12;
Embodiment 2
Slab melting composition is:
C:0.20%, Si:0.48%, Mn:1.35%, P:0.005%, S:0.001%, Cr:0.60%; Ni:0.30%; Mo:0.30%; B:0.0018%; Ti:0.030%, Cr+Ni+Mo:1.20%, all the other are Fe and inevitable impurity.
Slab soaking temperature (DEG C): 1200; Soaking time (hour): 4.0; Roughing temperature (DEG C): 1050; Finish rolling start rolling temperature (DEG C): 1000; Finish rolling finishing temperature (DEG C): 850; High pressure water sprays number of times (secondary): 2; Quenching temperature (DEG C): 895; Speed of cooling (DEG C/s): 35; Tempering temperature (DEG C): 280, tempering time (minute): 200
Concrete step is as follows:
(1) KR hot metal pretreatment: S content controls lower than 0.002%;
(2) converter smelting: BOF oxygen argon gas top and bottom complex blowing takes off C, adopts the pushing off the slag of hydraulic pressure slide plate;
(3) LF external refining: about 15 minutes heat-up time;
(4) RH vacuum outgas: process 20 minutes, argon gas soft blow about 12 minutes after line feeding under being less than 200Pa vacuum tightness;
(5) heating of plate blank: soaking temperature range 1200 DEG C, soaking time scope 4.0 hours;
(6) roughing: start rolling temperature 1050 DEG C;
(7) finish rolling: start rolling temperature scope 1000 DEG C, finishing temperature scope 850 DEG C, high pressure water sprays 2 times, thinning scale on surface;
(8) quench: Heating temperature 895 DEG C, cooling by water velocity range 35 DEG C/s, forms the sub-alloy of high-density, obtains the martensitic microstructure of fine uniform;
(9) tempering: 280 DEG C of tempering 200 minutes.
Plate property:
Specification: steel plate thickness 30mm; Yield strength (MPa): 1200; Tensile strength (MPa): 1512; Elongation after fracture (%): 15; V-type transverse impact merit (-40 DEG C): 102J, 115J, 108J(specimen size 10 × 10 × 55mm); Surface Brinell hardness (HBW): 462; Surface of steel plate remanent magnetism (GS): 8.
Embodiment 3
Slab melting composition is:
C:0.19%, Si:0.50%, Mn:1.40%, P:0.007%, S:0.001%, Cr:0.55%; Ni:0.45%; Mo:0.29%; B:0.0015%; Ti:0.022%, Cr+Ni+Mo:1.29%, all the other are Fe and inevitable impurity.
Slab soaking temperature (DEG C): 1190; Soaking time (hour): 3.9; Roughing temperature (DEG C): 1035; Finish rolling start rolling temperature (DEG C): 995; Finish rolling finishing temperature (DEG C): 843; High pressure water sprays number of times (secondary): 3; Quenching temperature (DEG C): 896; Speed of cooling (DEG C/s): 33; Tempering temperature (DEG C): 260, tempering time (minute): 190;
Concrete step is as follows:
(1) KR hot metal pretreatment: S content controls lower than 0.002%;
(2) converter smelting: BOF oxygen argon gas top and bottom complex blowing takes off C, adopts the pushing off the slag of hydraulic pressure slide plate;
(3) LF external refining: about 18 minutes heat-up time;
(4) RH vacuum outgas: process 20 minutes, argon gas soft blow 11 minutes after line feeding under being less than 200Pa vacuum tightness;
(5) heating of plate blank: soaking temperature range 1190 DEG C, soaking time scope 3.9 hours;
(6) roughing: start rolling temperature 1035 DEG C;
(7) finish rolling: start rolling temperature scope 995 DEG C, finishing temperature scope 843 DEG C, high pressure water sprays 3 times, thinning scale on surface;
(8) quench: Heating temperature 896 DEG C, cooling by water velocity range 33 DEG C/s, forms the sub-alloy of high-density, obtains the martensitic microstructure of fine uniform;
(9) tempering: 260 DEG C of tempering 190 minutes.
Plate property:
Specification: steel plate thickness 60mm; Yield strength (MPa): 1220; Tensile strength (MPa): 1550; Elongation after fracture (%): 18; V-type transverse impact merit (-40 DEG C): 121J, 106J, 116J(specimen size 10 × 10 × 55mm); Surface Brinell hardness (HBW): 445; Surface of steel plate remanent magnetism (GS): 10.
Claims (8)
1. 1400MPa level surpasses a high-strength alloy steel, it is characterized in that, the composition of described steel alloy is as follows:
C:0.18-0.25%; Si:0.40-0.65%; Mn:1.10-1.40%; P≤0.009%; S≤0.002%; Cr:0.30-0.80%; Ni:0.20-0.60%; Mo:0.20-0.60%; B:0.0008-0.0025%; Ti:0.020-0.035%; All the other are Fe and inevitable impurity.
2. a kind of 1400MPa level as claimed in claim 1 surpasses high-strength alloy steel, it is characterized in that,
In described steel alloy, Cr+Ni+Mo total content >=0.70%.
3. a kind of 1400MPa level as claimed in claim 2 surpasses the manufacture method of high-strength alloy steel, and its processing step comprises:
KR hot metal pretreatment; Converter smelting; LF external refining; RH vacuum outgas; Heating of plate blank; Roughing; Finish rolling; Q-tempering.
4. a kind of 1400MPa level as claimed in claim 3 surpasses the manufacture method of high-strength alloy steel, and its processing step comprises:
(1) KR hot metal pretreatment: S content controls lower than 0.002%;
(2) converter smelting: BOF oxygen argon gas top and bottom complex blowing takes off C, adopts the pushing off the slag of hydraulic pressure slide plate;
(3) LF external refining: heat-up time 15-20 minute;
(4) RH vacuum outgas: process 20 minutes, argon gas soft blow 10-12 minute after line feeding under being less than 200Pa vacuum tightness;
(5) heating of plate blank: soaking temperature range 1180-1200 DEG C, soaking time scope 3.8-4.0 hour;
(6) roughing: start rolling temperature 1020-1050 DEG C;
(7) finish rolling: start rolling temperature scope 980-1000 DEG C, finishing temperature scope 840-850 DEG C, high pressure water sprays 1-3 time, thinning scale on surface;
(8) quench: Heating temperature 890-910 DEG C, cooling by water velocity range 20-35 DEG C/s, form the sub-alloy of high-density, obtain the martensitic microstructure of fine uniform;
(9) tempering: 200-280 DEG C of tempering 180-200 minute.
5. a kind of 1400MPa level as claimed in claim 3 surpasses the manufacture method of high-strength alloy steel, it is characterized in that, in described step (3), LF external refining: heat-up time 15-18 minute.
6. a kind of 1400MPa level as claimed in claim 3 surpasses the manufacture method of high-strength alloy steel, it is characterized in that, in described step (8), and quench cooling rate 30-35 DEG C/s.
7. a kind of 1400MPa level as claimed in claim 3 surpasses the manufacture method of high-strength alloy steel, it is characterized in that, in described step (7), finish rolling: start rolling temperature scope 990 DEG C, finishing temperature scope 845 DEG C, high pressure water sprays 2 times, thinning scale on surface.
8. a kind of 1400MPa level as claimed in claim 3 surpasses the manufacture method of high-strength alloy steel, it is characterized in that, described steel plate tensile strength > 1400MPa, yield strength > 1170MPa,-40 DEG C of horizontal low-temperature impact work > 50J, surface Brinell hardness > 430HBW, surface remanence < 15GS.
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| CN105648329A (en) * | 2016-03-09 | 2016-06-08 | 山东钢铁股份有限公司 | Control rolling and high strength ship-plate steel and producing method thereof |
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| CN105648329A (en) * | 2016-03-09 | 2016-06-08 | 山东钢铁股份有限公司 | Control rolling and high strength ship-plate steel and producing method thereof |
| CN105861928A (en) * | 2016-06-17 | 2016-08-17 | 山东钢铁股份有限公司 | 4-8mm thick HB450 grade wear-resistant steel plate used for engineering machinery and manufacturing method thereof |
| CN106756495A (en) * | 2016-12-19 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of 1760MPa superelevation strong anti-bullet steel and its manufacture method |
| CN107937803A (en) * | 2017-11-01 | 2018-04-20 | 山东钢铁股份有限公司 | One kind has low-temperature impact toughness wear-resisting steel plate and preparation method thereof |
| CN112126848A (en) * | 2020-08-20 | 2020-12-25 | 舞阳钢铁有限责任公司 | High-toughness quenched and tempered Q960 steel plate and production method thereof |
| CN112680665A (en) * | 2020-12-17 | 2021-04-20 | 安阳钢铁股份有限公司 | High-toughness 1300MPa ultrahigh-strength steel and manufacturing method thereof |
| CN113308648A (en) * | 2021-05-14 | 2021-08-27 | 唐山钢铁集团高强汽车板有限公司 | Cold-rolled martensite steel substrate and production method thereof |
| CN113308648B (en) * | 2021-05-14 | 2022-11-15 | 唐山钢铁集团高强汽车板有限公司 | Cold-rolled martensite steel substrate and production method thereof |
| CN114606434A (en) * | 2022-01-26 | 2022-06-10 | 南京钢铁股份有限公司 | Low-carbon equivalent high-toughness wear-resistant steel plate and manufacturing method thereof |
| CN114941068A (en) * | 2022-03-28 | 2022-08-26 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth microalloyed high-toughness 960 MPa-grade ultrahigh-strength steel |
| CN114941068B (en) * | 2022-03-28 | 2024-01-30 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth microalloyed high-toughness 960 MPa-level ultrahigh-strength steel |
| CN114892089A (en) * | 2022-05-21 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Method for improving hardness uniformity of wear-resistant steel section |
| CN114892089B (en) * | 2022-05-21 | 2023-09-05 | 湖南华菱湘潭钢铁有限公司 | Method for improving hardness uniformity of wear-resistant steel section |
| CN116219279A (en) * | 2022-12-23 | 2023-06-06 | 鞍钢股份有限公司 | High-strength high-toughness steel for nuclear reactor containment vessel and manufacturing method thereof |
| CN116219279B (en) * | 2022-12-23 | 2024-04-16 | 鞍钢股份有限公司 | High-strength high-toughness steel for nuclear reactor containment vessel and manufacturing method thereof |
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