CN103589969A - Production method of quenched and tempered high-intensity Q890D super-thick steel plate - Google Patents
Production method of quenched and tempered high-intensity Q890D super-thick steel plate Download PDFInfo
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Abstract
A production method of a quenched and tempered high-intensity Q890D super-thick steel plate comprises processing steps as follows: liquid iron pretreatment, converter steelmaking, secondary refining, continuous casting including dynamic soft reduction and electromagnetic stirring, heating, rolling, pre-straightening, online quenching, offline quenching, tempering, finishing, performance examination and ultrasonic flaw detection. Steel comprises chemical composition in percentage as follows: not more than 0.16% of C, 0.20%-0.40% of Si, 1.30%-1.40% of Mn, not more than 0.015% of P, not more than 0.003% of S, 0.03%-0.05% of Als, not more than 0.10% of Nb+V+Ti, not more than 1.0% of Cu+Ni, 0.35%-0.45% of Cr, 0.45%-0.70% of Mo, not more than 0.0025% of B and the balance of Fe and unavoidable impurities. The produced high-performance quenched and tempered high-intensity Q890D super-thick steel plate with a thickness ranging from 100 mm to 120 mm can meet the manufacturing requirement of heavy machinery for a mine, a port and the like.
Description
Technical field
The invention belongs to smelting iron and steel technology, particularly a kind of production method of modified high strength Q890D super-thick steel plate.
Background technology
Super-thick steel plate refers to the steel plate of thickness >=60mm.The method that prior art is produced super-thick steel plate mainly contains: static ingot and electroslag remelting steel ingot method, continuously cast bloom slab method, weld compound strand method, vertical continuous metal cast process.
General steel mill continuously cast bloom maximum ga(u)ge is 300mm, and only a few steel mill also has thick 400mm continuously cast bloom to produce.Along with the development of Wide and Thick Slab production technology, use the common intensity rank special heavy plate technology of 260～300mm slab production, 60～100mm very universal; Thickness is greater than 100mm common intensity rank super-thick steel plate, is all in the world to adopt steel ingot rolling, and the technique of this respect has relevant report; Thickness is greater than the modified high strength special heavy plate of 100mm, and after the rolling of employing steel ingot, modifier treatment is produced.
The high strength special heavy plate heart portion rolling deformation of continuous casting billet milling modifier treatment is not deep and thorough, produces many bad consequences: properties percent of pass is low, particularly poor impact toughness, performance at thickness direction is inhomogeneous, Z-direction poor performance, steel plate heart portion ballistic work is low, and steel plate inspection qualification rate is low.Thickness is greater than the modified high strength special heavy plate of 100mm, uses thick 300mm continuous casting billet milling modifier treatment to produce and has no relevant report.The steel ingot rolling super-thick steel plate rate of becoming a useful person is low, and general Wide and Thick Slab factory can not produce.
In the conventional special heavy plate operation of rolling of prior art, blank temperature is even, the temperature distribution T of its thickness direction
ncan think uniformly approximate.If reduce blank skin temperature, the temperature T of sotck thinkness direction
sbe cooled heterogeneous through forcing, after blank skin temperature reduces, can make resistance to deformation or the yield strength σ of top layer metal
sincrease, distortion difficulty increases, thereby suppresses the flow of metal of blank top layer, and increases the distortion of central zone with this, thereby makes the compression stress ot of thickness direction
tsurpass yielding stress σ
s, produce distortion more uniformly.Adopt sotck thinkness direction thermograde to control the technology of deformation of rolled wire, be referred to as thermograde rolling technique (Fig. 1, Fig. 2).
Thermograde rolling method is that steel slab surface temperature is reduced, and improves the deformation resistance of steel slab surface, and the heart portion of slab is introduced in the distortion during by rolling, but necessary high-speed rolling concentrates on slab top layer otherwise slab returns red after strain.The rolling method of thermograde rolling special heavy plate provides possibility for improving steel plate heart portion performance, and this technology can improve heart portion performance and the Z-direction performance of modified high strength special heavy plate.
Chinese patent CN200710193023.9 " a kind of high tensile steel plate and preparation method thereof " discloses a kind of 100Kg level yield strength and has been not less than 890MPa, the production method of the high tensile steel plate that thickness is 8～100mm, and its 70mm adopts steel ingot stocking with upper steel plate.Chinese patent CN201110093666.2 " quenched and tempered high tensile strength plate and production method thereof for wood based panel equipment " discloses a kind of actual NM400 of being steel plate, thickness is the production method of 70～120mm steel plate, steel plate adopts continuously cast bloom stocking, after quenching, tempering temperature is 300～350 ℃, and this type of steel plate can not be used as structural part.Chinese patent CN201210387796.1 " a kind of large for thickness oceanographic engineering quenched and tempered high tensile strength plate and production method thereof " discloses a kind of yield strength 480MPa, tensile strength 600MPa, the production method of maximum ga(u)ge 140mm steel plate, steel plate adopts steel ingot stocking.Chinese patent 201310178923.1 " a kind of heat treating method of super-thick steel plate " discloses the above high tensile steel plate heat treating method of a kind of thickness 100mm, steel plate low-pressure stage in quenching press adopt to swing cooling to solve the super-thick steel plate not saturating problem of quenching, it is that steel plate length is less than 9 meters that steel plate maximum length can not surpass low-pressure stage length, and this patent publish data is No. 45 steel of high-carbon for Mould Machining.
The improvement of the heavy equipment manufacturing technologies such as world's pick coal machine, with welded construction, replace steel casting, use in yield strength 500～890MPa modified high strength special heavy plate of series (100～120mm) delivery technical qualification, except meeting the routine inspection intensity, unit elongation, impelling strength of steel plate requires, propose steel plate yield tensile ratio simultaneously and be less than 0.92, the transverse impact merit at steel plate center is greater than 27J, and thickness directional properties reaches Z25, and it is qualified that steel plate carries out UT (Ultrasonic Testing) one-level one by one.For above-mentioned technical requirements, existing domestic and international manufacturing enterprise does not also have production report and the production actual achievement of continuously cast bloom stocking at present.After continuously cast bloom stocking, in the super-thick steel plate of modifier treatment production low compression ratio, there are many defects:
A. armor plate strength is qualified but toughness is low, can not meet standard-required;
B. steel plate is difficult to meet the requirement that heart portion transverse impact merit is greater than 27J;
C. steel plate is difficult to meet the requirement that thickness directional properties reaches Z25;
D. High Strength Steel Plate evenly extends low (≤6%), and strength and ductility product is little;
E. steel-plate ultrasound wave inspection qualification rate is low.
Summary of the invention
This patent purport has the production method that a kind of modified high strength Q890D super-thick steel plate is provided: the thick Clean Steel continuously cast bloom of employing 300mm is aided with heat and thermograde is depressed greatly fast speed rolling change rolled piece center texturizing condition, increase steel plate heart portion strong deformation, and it is cooling as conditioning heat treatment to utilize press quenching to force, the tissue of steel plate refinement after reservation controlled rolling, steel plate carries out the technology such as off-line modifier treatment and produces the modified high strength Q890D super-thick steel plate of thickness 100～120mm, steel plate yield strength is not less than 830MPa, tensile strength is not less than 880MPa, yield tensile ratio is less than 0.95, unit elongation is not less than 11%,-20 ℃ of KV
2(laterally) is not less than 27J, steel plate heart portion-20 ℃ KV
2(laterally) is not less than 27J, and thickness directional properties reaches Z25, and UT (Ultrasonic Testing) one-level is qualified, meets the needs that the heavy-duty machineries such as mine, harbour are manufactured.
Technical scheme of the present invention:
A kind of production method of modified high strength Q890D super-thick steel plate.The production process route of steel: hot metal pretreatment → converter steelmaking → external refining → continuous casting (dynamic soft-reduction+induction stirring) → heating → rolling → pre-straightening → press quenching → off-line quenching → tempering → finishing → service check → UT (Ultrasonic Testing).
The chemical constitution quality percentage composition of steel is: C≤0.16, Si=0.20～0.40, Mn=1.30～1.40, P≤0.015, S≤0.003, Als=0.03～0.05, Nb+V+Ti≤0.10, Cu+Ni≤1.0, Cr=0.35～0.45, Mo=0.45～0.70, B≤0.0025, surplus is Fe and inevitable impurity.Control CEV≤0.60, CEV is by CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 formula calculate.
(1) continuous casting: according to the mode of production of Clean Steel, produce 300 * 2280mm section continuously cast bloom, wherein in continuous casting, wrap superheating temperature and be less than 10 ℃, light draught 4mm, induction stirring electric current is by 295～305A(6.9～7.1Hz) control.
(2) heating: 1280～1300 ℃ of heating of plate blanks, heat-up time 10～15min/cm, soaking time is greater than 60min, upper surface temperature is higher than 10 ~ 20 ℃ of lower surfaces, slab heart portion temperature >=1250 ℃ of coming out of the stove.
(3) rolling:
stage start rolling temperature>=1200 ℃, 980～1050 ℃ of finish to gauge red temperatures, roughing adopts thermograde, depresses greatly, fast speed rolling, after slab broadening, use milling train de-scaling high pressure water continuously slab sky to be crossed to passage cooling, during 950～900 ℃ of steel slab surface temperature, depress greatly fast speed rolling, every time opens the cooling rolled piece of high pressure water, roughing speed is 2.0 ~ 2.5m/s, roughing guarantees that the last average draft of continuous two passage is not less than 16%, and workpiece thickness is controlled by guaranteeing after slab broadening that two percentage pass reductions are not less than 16% thickness.
stage finish rolling adopts thermograde, depresses greatly, fast speed rolling, 830 ~ 850 ℃ of start rolling temperatures, intermediate blank is empty to be crossed passage and uses milling train de-scaling high pressure water cooling to intermediate blank continuously, during 800～820 ℃ of intermediate blank surface temperatures, depress greatly fast speed rolling, finish rolling roll speed is 4.3 ~ 5.5m/s, every time opens the cooling rolled piece of high pressure water, 810 ~ 830 ℃ of controls of finish to gauge red temperature, open the according to target lower limit set of finishing temperature of cold temperature, every time draft must>=12%, last three passages accumulative total drafts are not less than 40%.
(4) pre-straightening: steel plate roll rear pre-straightening machine roll gap arrange number identical with steel plate nominal thickness, speed 0.23 ~ 0.25m/s, steel plate carries out pre-straightening before entering water.
(5) press quenching: steel plate enters 810 ~ 830 ℃ of water temps, rolls rear DQ section roller speed 0.23 ~ 0.25m/s, a, b, c, each section of upper and lower water yield 180 ~ 190 m of d
3/ min, speed of cooling is greater than 20 ℃/s; The water yield 390 ~ 400 m in ACC section
3/ min, the lower water yield 870 ~ 900m
3/ min, roller speed 0.80 ~ 0.85m/s steel plate swings and is cooled to room temperature.
(6) off-line quenches: 920 ~ 930 ℃ of quenching temperatures, and time inside furnace thickness of slab mm * (2.0 ~ 2.2) min/mm, steel plate should be greater than 15min in stove soaking time; Quenching press roller speed 2.25 ~ 2.35m/s, the high pressure section gap nozzle water yield 645 ~ 655m
3/ min.
(7) tempering: 630 ~ 650 ℃ of temperature, time inside furnace thickness of slab mm * (3.0 ~ 3.5) min/mm, air cooling.
(8) service check and UT (Ultrasonic Testing).
With aforesaid method, produce the modified high strength Q890D super-thick steel plate of thickness 100～120mm, steel plate yield strength is not less than 830MPa, and tensile strength is not less than 880MPa, and yield tensile ratio is less than 0.95, and unit elongation is not less than 11% ,-20 ℃ of KV
2(laterally) is not less than 27J, steel plate heart portion-20 ℃ KV
2(laterally) is not less than 27J, and thickness directional properties reaches Z25, and UT (Ultrasonic Testing) one-level is qualified, meets the needs that the heavy-duty machineries such as mine, harbour are manufactured.
Compared with prior art, the present invention has the following advantages:
A. adopt the thick continuously cast bloom of 300mm to produce the thick modified high strength Q890D super-thick steel plate of high performance 100 ~ 120mm, reduced production cost, met the requirement that mine, harbour machinery are manufactured.
B. heat and thermograde, depress fast speed rolling greatly and strongly increased steel plate heart portion distortion, improved steel plate heart portion's performance and Z-direction performance, improved the ultrasonic flaw detection qualification rate of steel plate.
C. utilize press quenching to force cooling as conditioning heat treatment, the tissue of steel plate heart portion refinement after the rolling of retention temperature gradient and controlled rolling, improves hardened and tempered steel plate heart portion performance, has improved modified rear steel plate plasticity and toughness.
D. steel plate evenly extends and is greater than 7%, and strength and ductility product improves more than 16%, and high-strength steel workpiece opposing shock load ability improves.
E. use continuously cast bloom to produce high performance modified high strength Q890D super-thick steel plate, operation is simple, technique easily realizes, and generally Wide and Thick Slab factory all can produce.
Accompanying drawing explanation
Fig. 1 is for forcing the temperature profile of cooling rear sotck thinkness direction.
Fig. 2 is for forcing the stress pattern of cooling rear sotck thinkness direction.
Fig. 3 is the modified high strength special heavy plate microstructure picture figure that the inventive method is produced.
In figure: the blank uniform temperature of Tn-tradition rolling distributes; Ts-adopts the non-homogeneous temperature distribution of blank; σ s-retrains yielding stress; σ t-thickness direction stress.
Embodiment
Below in conjunction with embodiment, further illustrate content of the present invention.
Embodiment 1: refining thickness of slab is the modified high strength Q890D super-thick steel plate of 100mm.
The composition mass percent of steel is: C=0.14, and Si=0.27, Mn=1.34, P=0.011, S=0.001, Als=0.038, Nb=0.018, V=0.050, Ti=0.022, Ni=0.22, Cr=0.38, Mo=0.54, B=0.0018, surplus is Fe and inevitable impurity; CEV=0.57.
(1) continuous casting: produce 300X2280mm section continuously cast bloom according to the mode of production of Clean Steel, wherein wrap superheating temperature in continuous casting and be less than 10 ℃, light draught 4mm, induction stirring electric current by 300A(7Hz) control.
(2) heating: 1290～1300 ℃ of heating of plate blanks, heat-up time 11min/cm, soaking time 64min, upper surface temperature is higher than 15 ℃ of lower surfaces, come out of the stove 1258 ℃ of heart portion temperature of slab.
(3) rolling:
1230 ℃ of stage start rolling temperatures, 1024 ℃ of finish to gauge red temperatures; After slab broadening, to slab, empty to cross 14 passages cooling continuously to use milling train de-scaling high pressure water, during 926 ℃ of steel slab surface temperature, depresses greatly fast speed rolling, and every time opens the cooling rolled piece of high pressure water, and roughing roll speed is 2.1m/s.Roughing guarantees the last average draft 16.3%, 17.4% of continuous two passage.After slab broadening, two passages are rolled into 150mm workpiece thickness.
(4) pre-straightening: pre-straightening machine roll gap arranges 100mm, speed 0.25 m/s, and steel plate carries out pre-straightening before entering water.
(5) press quenching: steel plate enters 820 ℃ of water temps; Roll rear DQ section, roller speed 0.25m/s, a, b, c, each section of upper and lower water yield 185 m of d
3/ min, 29 ℃/s of speed of cooling; ACC section is by upper water yield 400m
3/ min, lower water yield 892m
3/ min, roller speed swing and are cooled to room temperature by 0.85m/s steel plate.
(6) off-line quenches: 930 ℃ of temperature; Time inside furnace 200min, steel plate is at stove soaking time 18min; Quenching press roller speed 2.3m/s, the high pressure section gap nozzle water yield 650 m
3/ min.
(7) tempering: 650 ℃ of temperature; Time inside furnace 300min; Air cooling.
Actual measurement the present embodiment 100mm plate property: yield strength 882MPa, tensile strength 948MPa, unit elongation 18.2%, evenly extend 8.4%, yield tensile ratio 0.930 ,-20 ℃ of KV
2(laterally) mean value 101.6J, steel plate heart portion-20 ℃ KV
2(laterally) mean value 68.4J, thickness directional properties Ψ mean value 32.5%, clod wash are qualified; Steel plate is qualified according to GB2970 standard flaw detection one-level.
Embodiment 2: refining thickness of slab is the modified high strength Q890D super-thick steel plate of 120mm.
The chemical constitution mass percent of steel is:
C=0.14, Si=0.27, Mn=1.38, P=0.010, S=0.001, Als=0.040, Nb=0.015, V=0.048, Ti=0.018, Ni=0.25, Cr=0.40, Mo=0.52, B=0.0017, surplus is Fe and inevitable impurity; CEV=0.58.
The production craft step of steel and parameter are:
(1) continuous casting: produce 300X2280mm section continuously cast bloom according to the mode of production of Clean Steel, wherein wrap superheating temperature in continuous casting and be less than 10 ℃, light draught 4mm, induction stirring electric current by 300A(7Hz) control.
(2) heating: 1290～1300 ℃ of heating of plate blanks, heat-up time 13min/cm, soaking time 71min, upper surface temperature is higher than 18 ℃ of lower surfaces, come out of the stove 1261 ℃ of heart portion temperature of slab.
(3) rolling:
1228 ℃ of stage start rolling temperatures, 1031 ℃ of finish to gauge red temperatures; After slab broadening, to slab, empty to cross 13 passages cooling continuously to use milling train de-scaling high pressure water, during 930 ℃ of steel slab surface temperature, depresses greatly fast speed rolling, and every time opens the cooling rolled piece of high pressure water, and roughing roll speed is 2.1m/s.Roughing guarantees the last average draft 16.2%, 16.9% of continuous two passage.After slab broadening, two passages are rolled into 160mm workpiece thickness.
(4) pre-straightening: pre-straightening machine roll gap arranges 120mm, speed 0.23 m/s, and steel plate carries out pre-straightening before entering water.
(5) press quenching: steel plate enters 816 ℃ of water temps; Roll rear DQ section, roller speed 0.23m/s, a, b, c, each section of upper and lower water yield 190 m of d
3/ min, 29 ℃/s of speed of cooling; ACC section is by upper water yield 400m
3/ min, lower water yield 898m
3/ min, roller speed swing and are cooled to room temperature by 0.85m/s steel plate.
(6) off-line quenches: 930 ℃ of temperature; Time inside furnace 244min, steel plate is at stove soaking time 16min; Quenching press roller speed 2.3m/s, the high pressure section gap nozzle water yield 650 m
3/ min.
(7) tempering: 630 ℃ of temperature; Time inside furnace 375min; Air cooling.
Actual measurement the present embodiment 120mm plate property: yield strength 882MPa, tensile strength 936MPa, unit elongation 17.8%, evenly extend 7.9%, yield tensile ratio 0.942 ,-20 ℃ of KV
2(laterally) mean value 109.4J, steel plate heart portion-20 ℃ KV
2(laterally) mean value 69.6J, thickness directional properties Ψ mean value 36.7%, clod wash are qualified; Steel plate is qualified according to GB2970 standard flaw detection one-level.
Claims (1)
1. the production method of a modified high strength Q890D super-thick steel plate, processing step is hot metal pretreatment → converter steelmaking → external refining → continuous casting (dynamic soft-reduction+induction stirring) → heating → rolling → pre-straightening → press quenching → off-line quenching → tempering → finishing → service check → UT (Ultrasonic Testing), it is characterized in that:
The chemical constitution mass percent of steel is C≤0.16, Si=0.20～0.40, Mn=1.30～1.40, P≤0.015, S≤0.003, Als=0.03～0.05, Nb+V+Ti≤0.10, Cu+Ni≤1.0, Cr=0.35～0.45, Mo=0.45～0.70, B≤0.0025, surplus is Fe and inevitable impurity, controls CEV≤0.60, and CEV is by CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 formula calculate;
Critical process step is:
(1) continuous casting: according to the mode of production of Clean Steel, produce 300 * 2280mm section continuously cast bloom, wherein in continuous casting, wrap superheating temperature and be less than 10 ℃, light draught 4mm, induction stirring electric current is by 295～305A(6.9～7.1Hz) control;
(2) heating: 1280～1300 ℃ of heating of plate blanks, heat-up time 10～15min/cm, soaking time is greater than 60min, upper surface temperature is higher than 10 ~ 20 ℃ of lower surfaces, slab heart portion temperature >=1250 ℃ of coming out of the stove;
(3) rolling:
stage start rolling temperature>=1200 ℃, 980～1050 ℃ of finish to gauge red temperatures, roughing adopts thermograde, depresses greatly, fast speed rolling, after slab broadening, use milling train de-scaling high pressure water continuously slab sky to be crossed to passage cooling, during 950～900 ℃ of steel slab surface temperature, depress greatly fast speed rolling, every time opens the cooling rolled piece of high pressure water, roughing speed is 2.0 ~ 2.5m/s, roughing guarantees that the last average draft of continuous two passage is not less than 16%, and workpiece thickness is controlled by guaranteeing after slab broadening that two percentage pass reductions are not less than 16% thickness;
stage finish rolling adopts thermograde, depresses greatly, fast speed rolling, 830 ~ 850 ℃ of start rolling temperatures, intermediate blank is empty to be crossed passage and uses milling train de-scaling high pressure water cooling to intermediate blank continuously, during 800～820 ℃ of intermediate blank surface temperatures, depress greatly fast speed rolling, finish rolling roll speed is 4.3 ~ 5.5m/s, every time opens the cooling rolled piece of high pressure water, 810 ~ 830 ℃ of controls of finish to gauge red temperature, open the according to target lower limit set of finishing temperature of cold temperature, every time draft must>=12%, last three passages accumulative total drafts are not less than 40%;
(4) pre-straightening: steel plate roll rear pre-straightening machine roll gap arrange number identical with steel plate nominal thickness, speed 0.23 ~ 0.25m/s, steel plate carries out pre-straightening before entering water;
(5) press quenching: steel plate enters 810 ~ 830 ℃ of water temps, rolls rear DQ section roller speed 0.23 ~ 0.25m/s, a, b, c, each section of upper and lower water yield 180 ~ 190 m of d
3/ min, speed of cooling is greater than 20 ℃/s; The water yield 390 ~ 400 m in ACC section
3/ min, the lower water yield 870 ~ 900m
3/ min, roller speed 0.80 ~ 0.85m/s steel plate swings and is cooled to room temperature;
(6) off-line quenches: 920 ~ 930 ℃ of quenching temperatures, and time inside furnace thickness of slab mm * (2.0 ~ 2.2) min/mm, steel plate should be greater than 15min in stove soaking time; Quenching press roller speed 2.25 ~ 2.35m/s, the high pressure section gap nozzle water yield 645 ~ 655m
3/ min;
(7) tempering: 630 ~ 650 ℃ of temperature, time inside furnace thickness of slab mm * (3.0 ~ 3.5) min/mm, air cooling;
(8) service check and UT (Ultrasonic Testing).
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| CN111910127B (en) * | 2020-08-07 | 2022-02-22 | 安阳钢铁股份有限公司 | Q890 steel plate for hydraulic support meeting welding heat input of 30kJ/cm and preparation method thereof |
| CN112853223A (en) * | 2021-01-04 | 2021-05-28 | 邯郸钢铁集团有限责任公司 | Steel Q890D for tempering-free ultrahigh-strength engineering machinery and production method thereof |
| CN112853223B (en) * | 2021-01-04 | 2022-06-28 | 邯郸钢铁集团有限责任公司 | Steel Q890D for tempering-free ultrahigh-strength engineering machinery and production method thereof |
| CN114807556A (en) * | 2022-05-24 | 2022-07-29 | 首钢京唐钢铁联合有限责任公司 | Method for producing Q960E ultrahigh-strength steel by online quenching |
| CN114990305A (en) * | 2022-05-24 | 2022-09-02 | 首钢京唐钢铁联合有限责任公司 | Method for producing Q890D ultrahigh-strength steel medium plate through online quenching |
| CN114990305B (en) * | 2022-05-24 | 2024-03-19 | 首钢京唐钢铁联合有限责任公司 | Method for producing Q890D ultra-high strength steel medium plate through on-line quenching |
| CN114807556B (en) * | 2022-05-24 | 2024-03-19 | 首钢京唐钢铁联合有限责任公司 | Method for producing Q960E ultrahigh-strength steel through online quenching |
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