CN110423946A - A kind of production method of low compression ratio super-high strength steel Q960E special heavy plate - Google Patents

A kind of production method of low compression ratio super-high strength steel Q960E special heavy plate Download PDF

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Publication number
CN110423946A
CN110423946A CN201910821629.5A CN201910821629A CN110423946A CN 110423946 A CN110423946 A CN 110423946A CN 201910821629 A CN201910821629 A CN 201910821629A CN 110423946 A CN110423946 A CN 110423946A
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steel
rolling
high strength
temperature
compression ratio
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Inventor
张青学
刘丹
高擎
罗登
彭宁琦
李红英
吴光亮
周文浩
张成元
王双双
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Central South University
Hunan Valin Xiangtan Iron and Steel Co Ltd
Hunan Hualing Xiangtan Iron and Steel Co Ltd
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Central South University
Hunan Hualing Xiangtan Iron and Steel Co Ltd
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Priority to CN201910821629.5A priority Critical patent/CN110423946A/en
Publication of CN110423946A publication Critical patent/CN110423946A/en
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Abstract

The present invention is a kind of production method of low compression ratio super-high strength steel Q960E special heavy plate, the chemical component mass percent of steel is C=0.15 ~ 0.20, Si=0.15~0.35, Mn=1.0~1.50, P≤0.012, S≤0.003, Nb=0.020 ~ 0.035, V=0.030 ~ 0.060, Ti=0.010 ~ 0.025, Als=0.020~0.045, Cr=0.50~0.80, Mo=0.40~0.60, Ni=1.00 ~ 1.40, B=0.0008 ~ 0.0025, CEV≤0.68, surplus are Fe and other microelements.Its processing step includes molten iron pretreatment → converter smelting → LF external refining → VD vacuum processing → continuous casting → heating → rolling → aligning → quenching → tempering → finishing → service check → flaw detection.Break through the limitation of traditional slab production super-high strength steel compression ratio, realize that rolling reduction 2.2 ~ 3.0 produces big thickness super-high strength steel, steel plate thickness direction performance difference is small, poor mechanical property: yield strength≤30MPa, tensile strength≤25MPa, elongation percentage≤2%, -40 DEG C of impact of collision function≤20J, side knock function≤15J.

Description

A kind of production method of low compression ratio super-high strength steel Q960E special heavy plate
Technical field
The invention belongs to steelmaking technical field, in particular to a kind of production of low compression ratio super-high strength steel Q960E special heavy plate Method.
Background technique
As coal mine machinery and engineering machinery develop towards enlarged heavy-duty, low-intensity steel plate and general thickness steel plate are It is not able to satisfy part special construction part production requirement.Because being limited to the requirement of Heavy plate production compression ratio, special heavy plate production is adopted mostly With steel ingot rolling and continuous casting billet composite rolling, high production cost, the period is long, and production efficiency is low.
CN 102330017A discloses a kind of method under the conditions of small reduction ratio using continuous casting billet production super-thick steel plate, raw The intensity rank for producing steel plate is Q345, and yield strength 300MPa or so, tensile strength 500MPa or so, alloying component content is low, It is small that plate blank coarse micro-grain quality controls difficulty.
CN 106244922A discloses a kind of big thickness Q960E super-high strength steel production method, sotck thinkness 320mm, production Finished steel plate is with a thickness of 70mm, width specifications < 2800mm, compression ratio > 4, it then follows the compression that traditional Heavy Plate Production requires General requirement than > 3.
CN 105177424A discloses a kind of high strength special heavy plate and its production method, and alloying component content is high, steel ingot Rolling lumber recovery is low, high production cost, and the production cycle is long.
Summary of the invention
The present invention is intended to provide a kind of production method of the special thick ultra-high strength steel plate of low compression ratio, produced steel plate use blank Thickness 300mm, steel plate finished product thickness specification 90-120mm, width 2000-3000mm break through traditional continuous casting material thickness to rolling The limitation of steel plate thickness reduces requirement of the special heavy plate production to compression ratio, and compression ratio is 2.2 ~ 3.0.
Technical solution of the present invention:
A kind of production method of low compression ratio super-high strength steel Q960E special heavy plate, production process route are molten iron pretreatment → converter Smelting → LF external refining → VD vacuum processing → continuous casting → heating → rolling → aligning → quenching → tempering → finishing → performance Inspection → flaw detection.The chemical composition mass percentage of steel is C=0.15 ~ 0.20, Si=0.15~0.35, Mn=1.0~1.50, P ≤ 0.012, S≤0.003, Nb=0.020 ~ 0.035, V=0.030 ~ 0.060%, Ti=0.010 ~ 0.025, Als=0.020~ 0.045, Cr=0.50~0.80, Mo=0.40~0.60, Ni=1.00 ~ 1.40, B=0.0008 ~ 0.0025, CEV≤0.68, it is remaining Amount is Fe and other microelements;Critical process step includes:
(1) it smelts: producing and control according to clean steel, 6 ~ 18 DEG C of the continuous casting degree of superheat, section 300mm × 2270mm, electromagnetic agitation electricity Flow 250-290A, frequency 5-6.5HZ, dynamic soft-reduction 6-7mm;
(2) roll: 1220~1250 DEG C of slab heating temperature, the operation of rolling is rolled using two-stage control, and roughing has twice Secondary reduction ratio is greater than 15%, single pass rolling reduction >=35mm, and 800 ~ 820 DEG C of finish rolling start rolling temperature, 800 ~ 830 DEG C of finishing temperature;It rolls It is quickly cooled down afterwards by Mulpic, high pressure section hydraulic pressure 4.5-5bar, water 170-180m3/ min, roller speed 0.25-0.3m/s;Steel Plate swing in low pressure stage and is cooled to room temperature, hydraulic pressure 0.8-1.2bar, water 480-530m3/ min, roller speed 0.45-0.5 m/ s;
(3) quenched: 870-930 DEG C of hardening heat, heating time is plate thickness mm × (1.8~2.1) min/mm;Tempering temperature 550 ~650 DEG C, plate thickness mm × (2.2~2.5) min/mm is air-cooled to room temperature after coming out of the stove.
The final steel plate obtained based on tempered sorbite, yield strength are greater than 960Mpa, and tensile strength 980 ~ 1100MPa, elongation percentage are greater than 13%, and longitudinally, laterally Charpy-V impact power (- 40 DEG C) respectively reaches 60 and 40J or more.
The principle of the present invention:
(1) Design of Chemical Composition: C content increases, and conducive to the harden ability and intensity for improving steel, the present invention designs steel plate thickness specification Greatly, height is required to harden ability, C content lower limit is 0.15%;C content height will affect the welding performance of steel, in addition, C content is more than When 0.2%, certain acicular martensitic structure can be generated, influences the low-temperature flexibility of steel, C content upper control limit of the present invention is 0.20%.The intensity, hardness and harden ability of steel can be improved in Mn element, particularly with the think gauge high strength steel for requiring high-hardenability Plate must assure that higher Mn content;Mn element is easy segregation element, and Mn too high levels, slab segregation control difficulty is big, and gives birth to It produces low compression ratio slab and height is required to slab internal soundness, therefore it is 1.00~1.50% that the present invention, which designs Mn content,.It is big to meet Requirement of the thickness specification steel plate to harden ability, design add Cr, Mo, Ni to improve harden ability and intensity, Ni content >=1% are added When, it is remarkably improved post-curing effect and the property of softening resistant to high temperatures;Tempering resistance equally can be improved in the addition of Cr, Mo element, But additional amount excessively high Cr, Mo will lead to carbon equivalent height, influence solderability, therefore use the conjunction based on Ni element, supplemented by Cr, Mo Golden component system.Meanwhile to avoid this adverse effect, need to add micro B to improve harden ability.B content in steel is super When 0.0030%, phase containing B can be generated, these borides are precipitated along crystal boundary and cause hot-short, influence toughness and the surface of steel Quality.Nb can inhibit the recrystallization of high temperature deformation process, can be improved Unhydrated cement temperature range, but the solubility of Nb by C, The influence of Mn content, Nb content control of the present invention is 0.020 ~ 0.035%.The reply and length of steel drawing process middle plate strip tissue Greatly, it will lead to the reduction of intensity;Center portion position because of the reason of harden ability caused by phase transformation strengthening it is insufficient.For the intensity for making up steel Loss and raising steel plate center portion intensity, the intensity for improving steel is precipitated using the tempering of V, acts on big thickness specification high-strength steel Middle performance is particularly evident.
(2) rolling mill practice: to guarantee that roll-force infiltrates into center portion, it need to guarantee heating of plate blank uniform well-burnt, inside and outside temperature difference It is small;And heating temperature is excessively high, will lead to abnormal grain growth.Rule of thumb formula calculates NbCN2Solid solubility temperature is 1199.9 DEG C, slab heating temperature is limited to 1250 DEG C and 1220 DEG C up and down.Because rolling reduction is small, it is desirable that the two passage single tracks pressure of roughing end Amount is not less than 35mm, it is ensured that recrystallization zone rolling sufficiently refinement crystal grain, finishing stands are to protect based on plate shape.Mulpic is utilized after rolling High pressure section is quickly cooled down, and low pressure stage swing is cooled to room temperature, and the dislocation strengthening effect of rolling is retained to the greatest extent, and passes through Phase transformation thinning microstructure provides size lesser original austenite grains for heat-treated steel plate.
(3) heat treatment process: austenitizing temperature and soaking time influence the alloying element solid solution in material, influence through hardening Property and grain size.Big thickness specification steel plate quenching process is asynchronous because temperature change at different-thickness position and phase transformation, leads There are larger internal stress for cause, need to carry out high tempering processing, are guaranteeing mechanical property simultaneously, are utmostly going de-stress.
The present invention is produced by reasonable chemical component, rolling mill practice and Design of Heat Treatment Process using 300mm slab 90-120mm is thick, and 2000 ~ 3000mm wide ultrahigh-strength steel plates, performance indicator is met the requirements of the standard.The invention has the advantages that (1) slab Big thickness specification super-high strength steel is produced, compression ratio is small, only 2.2-3.0, breaks through billet size limitation, and lumber recovery is up to 90%, remote high 60-75% lumber recovery is produced in steel ingot;It is with short production cycle, it is at low cost.(2) operation of rolling makes full use of limited reduction ratio to refine Crystal grain remains rolled hardening using effective cooling way after rolling and acts on, and passes through the further thinning microstructure of phase transformation.(3) more Kind strengthening mechanism synergistic effect, steel plate thickness direction performance uniformity is good, and thickness effect is small, thickness direction mechanical property difference: Yield strength≤30MPa, tensile strength≤25MPa, elongation percentage≤2%, -40 DEG C of impact of collision function≤20J, side knock function≤ 15J。
Detailed description of the invention
Fig. 1 is 90mmQ960E metallographic structure figure in embodiment 1.
Fig. 2 is 120mmQ960E metallographic structure figure in embodiment 2.
Specific embodiment
The contents of the present invention are further illustrated below with reference to embodiment.
The production of embodiment 1:90mmQ960E steel plate
The composition mass percent of steel be C=0.16, Si=0.22, Mn=1.22, P=0.011, S=0.0021, Nb=0.029, V= 0.050, Ti=0.015, Als=0.030, Cr=0.62, Mo=0.51, Ni=1.15, B=0.0015, CEV=0.67, surplus Fe With other microelements.
Production craft step includes:
(1) converter, refining are produced according to clean steel and are controlled, hydrogen content 1.3ppm in molten steel, total oxygen content 8ppm, nitrogen content 35ppm.13 ~ 15 DEG C of the continuous casting degree of superheat, section 300mm × 2270mm, electromagnetic agitation electric current 265A, frequency 6HZ, dynamic soft-reduction 6.3mm。
(2) rolling mill practice: after the heated stove heating of slab, tapping temperature be 1240 DEG C, soaking time 41 minutes, roughing exhibition 3 reduction in pass 32mm, 37mm and 38mm after wide, reduction ratio is respectively 14%, 19% and 24%.Workpiece thickness is 120mm, essence Rolling finishing temperature is 801 ~ 824 DEG C, is rolled into the steel plate with a thickness of 90mm × 3000mm, is quickly cooled down after through Mulpic, high Press section hydraulic pressure 4.7-4.8bar, water 172-175m3/ min, roller speed 0.26-0.28m/s.Steel plate swing in low pressure stage cold But to room temperature, hydraulic pressure 0.9-1.0bar, water 491-502m3/ min, roller speed 0.47-0.48 m/s.
(3) hardening and tempering process: quenching temperature is 920 DEG C, cool time 180min, and tempering temperature is 630 DEG C, is returned The fiery time is 216min, and steel plate is air-cooled to room temperature after tempering.
The sample mechanics performance test results such as table 1 of steel.
The production of embodiment 2:120mmQ960E steel plate
The composition mass percent of steel are as follows: C=0.17, Si=0.22, Mn=1.25, P=0.010, S=0.0018, Nb=0.026, V= 0.052, Ti=0.018, Als=0.025, Cr=0.64, Mo=0.53, Ni=1.17, B=0.0014, CEV=0.68, surplus Fe With other microelements.Production craft step includes:
(1) converter, refining are produced according to clean steel and are controlled, hydrogen content 1.0ppm in molten steel, total oxygen content 9ppm, nitrogen content 30ppm.11 ~ 14 DEG C of the continuous casting degree of superheat, section 300mm × 2270mm, electromagnetic agitation electric current 267A, frequency 5.5HZ, Dynamic Light pressure Lower 6.5mm.
(2) rolling mill practice: after the heated stove heating of slab, tapping temperature be 1235 DEG C, soaking time 45 minutes, roughing exhibition 3 reduction in pass 34mm, 43mm and 45mm after wide, reduction ratio is respectively 13%, 18% and 23%.Workpiece thickness is 150mm, essence Rolling finishing temperature is 805 ~ 828 DEG C, is rolled into the steel plate with a thickness of 120mm × 2500mm, is quickly cooled down after through Mulpic, high Press 4.8 ~ 4.9bar of section hydraulic pressure, 174 ~ 178m of water3/ min, 0.26 ~ 0.27m/s of roller speed.Steel plate swing in low pressure stage cold But to room temperature, 1.0 ~ 1.1bar of hydraulic pressure, 512 ~ 524m of water3/ min, 0.45 ~ 0.46 m/s of roller speed.
(3) hardening and tempering process: quenching temperature is 920 DEG C, cool time 228min, and tempering temperature is 610 DEG C, is returned The fiery time is 276min, and steel plate is air-cooled to room temperature after tempering.
The sample mechanics performance test results such as table 1 of steel.
The sample mechanics performance test results of 1 embodiment steel of table

Claims (1)

1. a kind of production method of low compression ratio super-high strength steel Q960E special heavy plate, process route is molten iron pretreatment → converter smelting Refining → LF external refining → VD vacuum processing → continuous casting → heating → rolling → aligning → quenching → tempering → finishing → performance inspection Test → detect a flaw, it is characterised in that: the chemical composition mass percentage of steel be C=0.15 ~ 0.20, Si=0.15~0.35, Mn= 1.0~1.50, P≤0.012, S≤0.003, Nb=0.020 ~ 0.035, V=0.030 ~ 0.060%, Ti=0.010 ~ 0.025, Als= 0.020~0.045, Cr=0.50~0.80, Mo=0.40~0.60, Ni=1.00 ~ 1.40, B=0.0008 ~ 0.0025, CEV≤ 0.68, surplus is Fe and other microelements;Critical process step includes:
(1) it smelts: producing and control according to clean steel, 6 ~ 18 DEG C of the continuous casting degree of superheat, section 300mm × 2270mm, electromagnetic agitation electricity Flow 250-290A, frequency 5-6.5HZ, dynamic soft-reduction 6-7mm;
(2) roll: 1220~1250 DEG C of slab heating temperature, the operation of rolling is rolled using two-stage control, and roughing has two passages Reduction ratio is greater than 15%, single pass rolling reduction >=35mm, and 800 ~ 820 DEG C of finish rolling start rolling temperature, 800 ~ 830 DEG C of finishing temperature;After rolling It is quickly cooled down by Mulpic, high pressure section hydraulic pressure 4.5-5bar, water 170-180m3/ min, roller speed 0.25-0.3m/s;Steel plate Swing in low pressure stage and be cooled to room temperature, hydraulic pressure 0.8-1.2bar, water 480-530m3/ min, roller speed 0.45-0.5 m/s;
(3) quenched: 870-930 DEG C of hardening heat, heating time is plate thickness mm × (1.8~2.1) min/mm;Tempering temperature 550 ~650 DEG C, plate thickness mm × (2.2~2.5) min/mm is air-cooled to room temperature after coming out of the stove.
CN201910821629.5A 2019-09-02 2019-09-02 A kind of production method of low compression ratio super-high strength steel Q960E special heavy plate Pending CN110423946A (en)

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CN111394651A (en) * 2020-03-31 2020-07-10 湖南华菱湘潭钢铁有限公司 Atmospheric corrosion resistant steel for nuclear power heavy-duty supporting equipment and production method thereof
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CN113061815A (en) * 2021-03-24 2021-07-02 宝武集团鄂城钢铁有限公司 800 MPa-grade quenched and tempered high-strength steel with stable full-section impact performance and production method thereof

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111394651A (en) * 2020-03-31 2020-07-10 湖南华菱湘潭钢铁有限公司 Atmospheric corrosion resistant steel for nuclear power heavy-duty supporting equipment and production method thereof
CN111748678A (en) * 2020-07-08 2020-10-09 宝钢湛江钢铁有限公司 Low-compression-ratio large-thickness lamellar tearing-resistant steel plate and manufacturing method thereof
CN111748678B (en) * 2020-07-08 2022-05-17 宝钢湛江钢铁有限公司 Low-compression-ratio large-thickness lamellar tearing-resistant steel plate and manufacturing method thereof
CN113061815A (en) * 2021-03-24 2021-07-02 宝武集团鄂城钢铁有限公司 800 MPa-grade quenched and tempered high-strength steel with stable full-section impact performance and production method thereof

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