CN103556076B - A kind of production method of modified high strength Q690F super-thick steel plate - Google Patents

A kind of production method of modified high strength Q690F super-thick steel plate Download PDF

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CN103556076B
CN103556076B CN201310559835.6A CN201310559835A CN103556076B CN 103556076 B CN103556076 B CN 103556076B CN 201310559835 A CN201310559835 A CN 201310559835A CN 103556076 B CN103556076 B CN 103556076B
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steel plate
temperature
rolling
slab
speed
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CN103556076A (en
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杨云清
曹志强
杜江
汤伟
唐治宇
李�杰
李玉路
张青学
张勇伟
高擎
钱亚军
华浩
翟运涛
阳小兵
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Hunan Hualing Xiangtan Iron and Steel Co Ltd
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Abstract

A production method for modified high strength Q690F 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 → out-line quenching → tempering → finishing → service check → UT (Ultrasonic Testing).The chemical constitution percentage composition of steel is C≤0.14, Si=0.20 ~ 0.40, Mn=1.00 ~ 1.20, P≤0.015, S≤0.003, Als=0.03 ~ 0.05, Nb+V+Ti≤0.10, Cu+Ni≤1.0, Cr=0.40 ~ 0.60, Mo=0.45 ~ 0.70, B≤0.0025, surplus is Fe and inevitable impurity.Control CEV≤0.57, CEV is by CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 formula calculate.The modified high strength Q690F super-thick steel plate of the high-performance 100 ~ 120mm produced meets the needs that the heavy-duty machinery such as mine, harbour manufactures.

Description

A kind of production method of modified high strength Q690F super-thick steel plate
Technical field
The invention belongs to smelting iron and steel technology, particularly a kind of production method of modified high strength Q690F super-thick steel plate.
Background technology
Super-thick steel plate refers to the steel plate of thickness >=60mm.The method that prior art produces super-thick steel plate mainly contains: static ingot and electroslag remelting steel ingot method, continuously cast bloom slab method, welding 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 adopting steel ingot rolling, 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, uneven in the performance of thickness direction, 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.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 napproaches uniformity can be thought.If reduce blank skin temperature, the temperature T in sotck thinkness direction sbe through pressure cooled heterogeneous, blank skin temperature can make resistance to deformation or the yield strength σ of coating metal after reducing sincrease, distortion difficulty increases, thus suppresses the distortion of blank coating metal, and increases the distortion of central zone with this, thus makes the compression stress ot of thickness direction texceed yielding stress σ s, produce evenly distortion.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 reduced steel slab surface temperature, improves the deformation resistance of steel slab surface, distortion during rolling is introduced the heart portion of slab, but must high-speed rolling, otherwise slab returns red after strain concentrates on slab top layer.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 is not less than 890MPa, and thickness is the production method of the high tensile steel plate of 8 ~ 100mm, and its 70mm adopts steel ingot stocking with upper steel plate.It is NM400 steel plate that Chinese patent CN201110093666.2 " wood based panel equipment quenched and tempered high tensile strength plate and production method thereof " discloses one actual, thickness is the production method of 70 ~ 120mm steel plate, steel plate adopts continuously cast bloom stocking, after quenching, tempering temperature is 300 ~ 350 DEG C, and this type of steel plate can not use as structural part.Chinese patent CN201210387796.1 " a kind of heavy 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 adopts and swings cooling and to quench not saturating problem to solve super-thick steel plate, steel plate maximum length can not exceed low-pressure stage length and steel plate length is less than 9 meters, and these patent disclosure data are high-carbon No. 45 steel for Mould Machining.
The improvement of the heavy equipment manufacturing technologies such as world's pick coal machine, steel casting is replaced with welded construction, the modified high strength special heavy plate (100 ~ 120mm) of yield strength 500 ~ 890MPa series is used to deliver goods in technical qualification, except meeting the routine inspection intensity of steel plate, except unit elongation, impelling strength 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, current existing domestic and international manufacturing enterprise does not also have production report and the production actual achievement of continuously cast bloom stocking.After continuously cast bloom stocking modifier treatment production low compression ratio super-thick steel plate in there is 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 transverse impact merit in heart portion 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 provides a kind of production method of modified high strength Q690F super-thick steel plate: adopt 300mm thick Clean Steel continuously cast bloom to be aided with heat and the large pressure of thermograde fast speed rolling change rolled piece center deformation condition, increase steel plate heart portion strong deformation, and utilize press quenching to force cooling as conditioning heat treatment, 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 Q690F super-thick steel plate of thickness 100 ~ 120mm, steel plate yield strength is not less than 690MPa, tensile strength is not less than 760 MPa, yield tensile ratio is less than 0.92, unit elongation is not less than 15%, uniform elongation is not less than 8%,-60 DEG C of KV 2 (laterally) be not less than 47J, the steel plate heart-60 DEG C, portion KV 2(transverse direction) 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 machinery such as mine, harbour manufactures.
Technical scheme of the present invention:
A kind of production method of modified high strength Q690F 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 → out-line quenching → tempering → finishing → service check → UT (Ultrasonic Testing).
The chemical constitution mass percentage of steel is: C≤0.14, Si=0.20 ~ 0.40, Mn=1.00 ~ 1.20, P≤0.015, S≤0.003, Als=0.03 ~ 0.05, Nb+V+Ti≤0.10, Cu+Ni≤1.0, Cr=0.40 ~ 0.60, Mo=0.45 ~ 0.70, B≤0.0025, surplus is Fe and inevitable impurity.Control CEV≤0.57, CEV is by CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 formula calculate.
Critical process step:
(1) continuous casting: produce 300 × 2280mm section continuously cast bloom according to the mode of production of Clean Steel, wherein in continuous casting, bag superheating temperature is less than 10 DEG C, slighter compress amount 4mm, and induction stirring electric current is by 295 ~ 305A(6.9 ~ 7.1Hz) control.
(2) heat: heating of plate blank 1280 ~ 1300 DEG C, heat-up time 10 ~ 15min/cm, soaking time is greater than 60min, and upper surface temperature is higher than lower surface 10 ~ 20 DEG C, and slab is come out of the stove temperature >=1250 DEG C, heart portion.
(3) rolling: stage start rolling temperature>=1200 DEG C, finish to gauge red temperature 980 ~ 1050 DEG C, roughing adopts thermograde, large pressure, fast speed rolling, after slab broadening, milling train de-scaling high pressure water is used to cross passage cooling to slab sky continuously, large pressure fast speed rolling during steel slab surface temperature 950 ~ 900 DEG C, every time opens high pressure water cooling rolled piece, roughing speed is 2.0 ~ 2.5m/s, roughing ensures that finally the average draft of continuous two passage is not less than 16%, and workpiece thickness controls by ensureing after slab broadening that two percentage pass reductions are not less than the thickness of 16%.
stage finish rolling adopts thermograde, large pressure, fast speed rolling, start rolling temperature 830 ~ 850 DEG C, intermediate blank sky is crossed passage and uses milling train de-scaling high pressure water to cool intermediate blank continuously, large pressure fast speed rolling during intermediate blank surface temperature 800 ~ 820 DEG C, finish rolling roll speed is 4.3 ~ 5.5m/s, every time opens high pressure water cooling rolled piece, finish to gauge red temperature 810 ~ 830 DEG C control, open the lower limit set of cold temperature according to target finishing temperature, every time draft must>=12%, last three passages add up draft and are not less than 40%.
(4) pre-straightening: steel plate rolls rear pre-straightening machine roll gap and arranges several identical with steel plate nominal thickness, and speed 0.23 ~ 0.25m/s, steel plate carries out pre-straightening before entering water.
(5) press quenching: steel plate enters water temp 810 ~ 830 DEG C, rolls rear DQ section roller speed 0.23 ~ 0.25m/s, a, b, c, d about each section water yield 180 ~ 190 m 3/ min, speed of cooling is greater than 20 DEG C/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) out-line quenching: quenching temperature 920 ~ 930 DEG C, 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) off-line tempering: temperature 660 ~ 680 DEG C, time inside furnace thickness of slab mm × (3.0 ~ 3.5) min/mm, air cooling.
(8) service check and UT (Ultrasonic Testing).
Produce the modified high strength Q690F super-thick steel plate of thickness 100 ~ 120mm with aforesaid method, steel plate yield strength is not less than 690MPa, and tensile strength is not less than 760 MPa, and yield tensile ratio is less than 0.92, and unit elongation is not less than 15%, and uniform elongation is not less than 8% ,-60 DEG C of KV 2 (laterally) be not less than 47J, the steel plate heart-60 DEG C, portion KV 2(transverse direction) 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 machinery such as mine, harbour manufactures.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 Q690F super-thick steel plate of high performance 100 ~ 120mm, reduce production cost, meet the requirement meeting mine, harbour machinery manufacture.
B. heat and thermograde, the greatly fast speed rolling of pressure add the distortion of steel plate heart portion strongly, improve steel plate heart portion's performance and Z-direction performance, improve 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's refinement after the rolling of retention temperature gradient and controlled rolling, improves hardened and tempered steel plate heart portion performance, improves modified rear steel plate plasticity and toughness.
D. steel plate evenly extends and is greater than 8%, and strength and ductility product improves more than 30%, and high-strength steel workpiece opposing shock load ability improves.
E. use continuously cast bloom to produce high performance modified high strength Q690F super-thick steel plate, operation is simple, technique easily realizes, and general Wide and Thick Slab factory all can produce.
Accompanying drawing explanation
Fig. 1 is the temperature profile forcing the rear sotck thinkness direction of cooling.
Fig. 2 is the stress pattern forcing the rear sotck thinkness direction of cooling.
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 distribution of Tn-tradition rolling; Ts-adopts the distribution of blank non-uniform temperature; σ s-retrains yielding stress; σ t-thickness direction stress.
Embodiment
Content of the present invention is further illustrated below in conjunction with embodiment.
Embodiment 1: refining thickness of slab is the modified high strength Q690F super-thick steel plate of 100mm.
The chemical constitution mass percent of steel is: C=0.13, Si=0.24, Mn=1.12, P=0.010, S=0.001, Als=0.040, Nb=0.026, V=0.046, Ti=0.015, Ni=0.62, Cr=0.42, Mo=0.49, B=0.0018, surplus is Fe and inevitable impurity; CEV=0.55.
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 in continuous casting, bag superheating temperature is less than 10 DEG C, slighter compress amount 4mm, induction stirring electric current is by 300A(7Hz) control.
(2) heat: heating of plate blank 1290 ~ 1300 DEG C, heat-up time 11min/cm, soaking time 64min, upper surface temperature is higher than lower surface 15 DEG C, and slab is come out of the stove heart portion temperature 1258 DEG C.
(3) rolling: stage start rolling temperature 1230 DEG C, finish to gauge red temperature 1024 DEG C; After slab broadening, use milling train de-scaling high pressure water to cross 15 passage coolings to slab sky continuously, large pressure fast speed rolling during steel slab surface temperature 936 DEG C, every time opens high pressure water cooling rolled piece, and roughing roll speed is 2.1m/s.Roughing ensures the finally average draft 16.3%, 17.4% of continuous two passage.After slab broadening, two passes become 150mm workpiece thickness.
stage start rolling temperature 836 DEG C, intermediate blank sky is crossed 7 passages and is used milling train de-scaling high pressure water continuously to intermediate blank cooling, and intermediate blank surface temperature 809 DEG C is the fast speed rolling of pressure greatly, and finish rolling roll speed is 4.8m/s.Every time opens high pressure water cooling rolled piece, and finish to gauge red temperature 821 DEG C, opens the lower limit set of cold temperature according to target finishing temperature, every time draft must >=12%, last three passages add up draft and are not less than 40%.
(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 water temp 815 DEG C; Roll rear DQ section, roller speed 0.25m/s, a, b, c, d about each section water yield 185 m 3/ min, speed of cooling 29 DEG C/s; ACC section is by upper water yield 400m 3/ min, lower water yield 892m 3/ min, roller speed swings by 0.85m/s steel plate and is cooled to room temperature.
(6) out-line quenching: temperature 930 DEG C; 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: temperature 680 DEG C; Time inside furnace 300min; Air cooling.
Actual measurement the present embodiment 100mm plate property: yield strength 710MPa, tensile strength 781MPa, unit elongation 19.2%, evenly extend 8.9%, yield tensile ratio 0.909 ,-60 DEG C of KV 2(transverse direction) mean value 136J, the steel plate heart-60 DEG C, portion KV 2(transverse direction) mean value 88J, thickness directional properties Ψ mean value 45.2%, 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 Q690F super-thick steel plate of 120mm.
The chemical constitution mass percent of steel is:
C=0.13, Si=0.24, Mn=1.18, P=0.011, S=0.001, Als=0.040, Nb=0.026, V=0.042, Ti=0.016, Ni=0.61, Cr=0.44, Mo=0.48, B=0.0017, surplus is Fe and inevitable impurity; CEV=0.56.
Production craft step and parameter are:
(1) continuous casting: produce 300X2280mm section continuously cast bloom according to the mode of production of Clean Steel, wherein in continuous casting, bag superheating temperature is less than 10 DEG C, slighter compress amount 4mm, induction stirring electric current is by 300A(7Hz) control.
(2) heat: heating of plate blank 1290 ~ 1300 DEG C, heat-up time 13min/cm, soaking time 71min, upper surface temperature is higher than lower surface 18 DEG C, and slab is come out of the stove heart portion temperature 1261 DEG C.
(3) rolling: stage start rolling temperature 1228 DEG C, finish to gauge red temperature 1031 DEG C; After slab broadening, use milling train de-scaling high pressure water to cross 15 passage coolings to slab sky continuously, large pressure fast speed rolling during steel slab surface temperature 941 DEG C, every time opens high pressure water cooling rolled piece, and roughing roll speed is 2.1m/s.Roughing ensures the finally average draft 16.2%, 16.9% of continuous two passage.After slab broadening, two passes become 160mm workpiece thickness.
stage start rolling temperature 837 DEG C, intermediate blank sky is crossed 7 passages and is used milling train de-scaling high pressure water continuously to intermediate blank cooling, and intermediate blank surface temperature 809 DEG C is the fast speed rolling of pressure greatly, and finish rolling roll speed is 4.7m/s.Every time opens high pressure water cooling rolled piece, and finish to gauge red temperature 819 DEG C, opens the lower limit set of cold temperature according to target finishing temperature, every time draft must >=12%, last three passages add up draft and are not less than 40%.
(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 water temp 815 DEG C; Roll rear DQ section, roller speed 0.23m/s, a, b, c, d about each section water yield 187 m 3/ min, speed of cooling 28 DEG C/s; ACC section is by upper water yield 396m 3/ min, lower water yield 898m 3/ min, roller speed swings by 0.85m/s steel plate and is cooled to room temperature.
(6) out-line quenching: temperature 930 DEG C; Time inside furnace 240min, 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: temperature 670 DEG C; Time inside furnace 375min; Air cooling.
Actual measurement the present embodiment 120mm plate property: yield strength 720MPa, tensile strength 797MPa, unit elongation 21.4%, evenly extend 9.2%, yield tensile ratio 0.903 ,-60 DEG C of KV 2(transverse direction) mean value 127J, the steel plate heart-60 DEG C, portion KV 2(transverse direction) mean value 69J, thickness directional properties Ψ mean value 43.5%, 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 Q690F super-thick steel plate, processing step is hot metal pretreatment → converter steelmaking → external refining → continuous casting → heating → rolling → pre-straightening → press quenching → out-line quenching → tempering → finishing → service check → UT (Ultrasonic Testing), it is characterized in that: the composition mass percentage of steel is C≤0.14, Si=0.20 ~ 0.40, Mn=1.00 ~ 1.20, P≤0.015, S≤0.003, Als=0.03 ~ 0.05, Nb+V+Ti≤0.10, Cu+Ni≤1.0, Cr=0.40 ~ 0.60, Mo=0.45 ~ 0.70, B≤0.0025, surplus is Fe and inevitable impurity, control CEV≤0.57, CEV is by CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 formula calculate,
Critical process step is:
(1) produce 300 × 2280mm section continuously cast bloom according to the mode of production of Clean Steel, wherein in continuous casting, bag superheating temperature is less than 10 DEG C, slighter compress amount 4mm, induction stirring electric current 295 ~ 305A, frequency 6.9 ~ 7.1Hz;
(2) heat: heating of plate blank 1280 ~ 1300 DEG C, heat-up time 10 ~ 15min/cm, soaking time is greater than 60min, and upper surface temperature is higher than lower surface 10 ~ 20 DEG C, and slab is come out of the stove temperature >=1250 DEG C, heart portion;
(3) rolling: stage start rolling temperature>=1200 DEG C, finish to gauge red temperature 980 ~ 1050 DEG C, roughing adopts thermograde, large pressure, fast speed rolling, after slab broadening, milling train de-scaling high pressure water is used to cross passage cooling to slab sky continuously, large pressure fast speed rolling during steel slab surface temperature 950 ~ 900 DEG C, every time opens high pressure water cooling rolled piece, roughing speed is 2.0 ~ 2.5m/s, roughing ensures that finally the average draft of continuous two passage is not less than 16%, and workpiece thickness controls by ensureing after slab broadening that two percentage pass reductions are not less than the thickness of 16%; stage finish rolling adopts thermograde, large pressure, fast speed rolling, start rolling temperature 830 ~ 850 DEG C, intermediate blank sky is crossed passage and uses milling train de-scaling high pressure water to cool intermediate blank continuously, large pressure fast speed rolling during intermediate blank surface temperature 800 ~ 820 DEG C, finish rolling roll speed is 4.3 ~ 5.5m/s, every time opens high pressure water cooling rolled piece, red temperature 810 ~ 830 DEG C after finish to gauge, open the lower limit set of cold temperature according to target finishing temperature, every time draft must>=12%, last three passages add up draft and are not less than 40%;
(4) pre-straightening: steel plate rolls rear pre-straightening machine roll gap and arranges several identical with steel plate nominal thickness, speed 0.23 ~ 0.25m/s, and steel plate carries out pre-straightening before entering water;
(5) press quenching: steel plate enters water temp 810 ~ 830 DEG C, rolls rear DQ section roller speed 0.23 ~ 0.25m/s, a, b, c, d about each section water yield 180 ~ 190 m 3/ min, speed of cooling is greater than 20 DEG C/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) out-line quenching: quenching temperature 920 ~ 930 DEG C, 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: temperature 660 ~ 680 DEG C, 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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