CN102560274A - Hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and production method thereof - Google Patents

Hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and production method thereof Download PDF

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Publication number
CN102560274A
CN102560274A CN2011104108026A CN201110410802A CN102560274A CN 102560274 A CN102560274 A CN 102560274A CN 2011104108026 A CN2011104108026 A CN 2011104108026A CN 201110410802 A CN201110410802 A CN 201110410802A CN 102560274 A CN102560274 A CN 102560274A
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China
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steel
strength steel
high strength
1000mpa
steel plate
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宋欣
王根矶
刘春明
邹阳
顾林豪
陈楠
何元春
白学军
姜中行
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Shougang Corp
Qinhuangdao Shouqin Metal Materials Co Ltd
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Shougang Corp
Qinhuangdao Shouqin Metal Materials Co Ltd
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Abstract

The invention provides hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and a production method thereof. The steel comprises the following chemical components by weight percent: 0.15%-0.20% of C, 0.10%-0.40% of Si, 1.00%-1.50% of Mn, 0.30%-0.50% of Cr, 0.30%-0.50% of Mo, 0.20%-0.50% of Ni, 0.0010%-0.0030% of B, 0.010%-0.030% of Nb, 0.030%-0.050% of V, 0.010%-0.020% of Ti, 0.030%-0.050% of Alt, less than or equal to 0.020% of P and less than or equal to 0.010% of S. The steel can meet the property requirement of the1000MPa-grade hardened and tempered ultrahigh-strength steel.

Description

Modified super-high strength steel of a kind of ys 1000MPa level and method of manufacture thereof
Technical field
The present invention relates to the modified super-high strength steel of a kind of ys 1000MPa level, relate to a kind of method of manufacture of this rank steel grade simultaneously, belong to technical field of ferrous metallurgy.
Background technology
Engineering machinery requires material to have higher intensity, good impelling strength, cold formability and good welding property with steel; Along with engineering machinery develops to maximization, lightness, particularly outstanding to above-mentioned performance demands.Modified super-high strength steel has intensity, toughness, plasticity, weldability etc. preferably, has been widely used in all kinds of engineering machinery welding structural elements, and for adapting to its maximization, light-weighted requirement, the quenching and tempering, high rank is increasingly high.At home, the production of modified super-high strength steel >=1000MPa still has certain degree of difficulty; Many patents or paper provided only is the data of experimental stage, the industrial production that distance is actual and use a certain distance is still arranged; The working method of this steel grade is not produced and made to report.
Modified super-high strength steel is because of having relatively high expectations to various performance index, and is in process of production, comparatively strict for smelting, rolling, heat treated range request; Receive the influence of factors such as manufacturing cost, Technology, production unit, for modified super-high strength steel, many enterprises still can not produce.
The present invention successfully develops the modified super-high strength steel and the working method thereof of different thickness specification according to the knowhow of reality.
Summary of the invention
The purpose of this invention is to provide a kind of modified super-high strength steel of clothes intensity 1000MPa level and method of manufacture thereof.Its chemical ingredients of the present invention is (weight), C:0.15%~0.20%; Si:0.10%~0.40%; Mn:1.00%~1.50%; Cr:0.30%~0.50%; Mo:0.30%~0.50%; Ni:0.20%~0.50%; B:0.0010%~0.0030%; Nb:0.010%~0.030%; V:0.030%~0.050%; Ti:0.010%~0.020%; Alt:0.030%~0.050%; P :≤0.020%; S :≤0.010%; Carbon equivalent Ceq (%)=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15:0.55~0.60; All the other are Fe and inevitable impurity.The modified super-high strength steel manufacturing step of a kind of ys 1000MPa level is following:
Molten steel is smelted: operational path-desulfurizing iron is skimmed → converter smelting → LF stove refining → RH refining; In smelting process, strict control carbon, phosphorus, sulphur composition also guarantees that carbon equivalent is in span of control; Carbon equivalent is influenced by multiple elements such as carbon, manganese, copper, nickel, and wherein carbon is the element of omnidistance control, and other each alloy is all different with method because of the operation of alloy property and alloying.
The steel billet casting: adopt terminal strong cold-peace gently to depress technology in the casting cycle, and pulling rate, secondary cooling system, tundish molten steel overheat are optimized and control, control casting billet surface and internal soundness are for follow-up steel plate rolling creates conditions.
Steel billet heating: adopt walking beam heating furnace that steel billet is heated to 1160 ℃~1240 ℃ of design temperatures, rationally control 950 ℃~1260 ℃ of each heating zone temperature, remaining oxygen and steel billet time inside furnace 250min~400min, guarantee the abundant austenitizing of steel billet.
Steel plate rolling: for hardened and tempered steel plate, under the certain prerequisite of composition system, control requires not strict to the operation of rolling; In the operation of rolling, adopt two stage cooling controlling and rolling controlling process, guarantee the roughing end temp 950 ℃ and more than, about 820 ℃ of finish rolling end temps; For guaranteeing to roll back surface of steel plate strip shape quality, can adopt than thin specification steel plate directly rolling, air cooling behind the steel plate rolling; Adopt controlled rolling than thick steel plates, need not to adopt strong water-cooling pattern to cool off behind the steel plate rolling; In the finish rolling stage, steel plate is treated that temperature thickness does not also have strict demand.
Quench treatment: according to the composition system and the complete austenitic temperature of steel plate of different size steel plate, rationally set 880 ℃~950 ℃ of quenching temperatures and soaking time 10min~30min, all the other processes are carried out process furnace heated mould shape parameter.Temper: tempering temperature is set 450 ℃~600 ℃ of tempering temperatures and soaking time 8min~50min according to quench back plate property and experimental study result, and all the other processes are carried out process furnace heated mould shape parameter.
The invention has the beneficial effects as follows; Through above technical process; The modified super-high strength steel stable mechanical property of producing; Wherein: go up ys ReH >=1000MPa, tensile strength Rm >=1040MPa, elongation after fracture A=10%~18% ,-40 ℃ of impact value AKv=30J~90J, have intensity, plasticity, toughness preferably, can reach the performance requriements of the modified super-high strength steel of 1000MPa level.
Welding test: through selecting suitable welding material and weldprocedure, 20mm and 40mm specification steel plate are carried out " breeches joint crack test ", test-results shows that modified super-high strength steel welding property that the present invention produces is than more excellent.
Description of drawings
Fig. 1 is the metallographic structure of embodiment 12mm specification steel plate typical case quenching attitude.
Fig. 2 is the metallographic structure of embodiment 20mm specification steel plate typical case quenching attitude.
Fig. 3 is the metallographic structure of embodiment 40mm specification steel plate typical case quenching attitude.
Fig. 4 is the metallographic structure of embodiment 50mm specification steel plate typical case quenching attitude.
Fig. 5 is the metallographic structure of embodiment 12mm specification steel plate typical case tempering attitude.
Fig. 6 is the metallographic structure of embodiment 20mm specification steel plate typical case tempering attitude.
Fig. 7 is the metallographic structure of embodiment 40mm specification steel plate typical case tempering attitude.
Fig. 8 is the metallographic structure of embodiment 50mm specification steel plate typical case tempering attitude.
Embodiment
The chemical ingredients scope of " the modified super-high strength steel of 1000MPa level " according to the present invention accomplishes at the 4300mm of company of first Qin Wide and Thick Slab production line that steel billet is smelted, (slab specification: 250mm * 1600mm * 2700mm~4100mm), steel plate rolling (rolling specs: 12mm, 20mm, 40mm, 50mm), quenching and tempering are handled in the slab casting.The actual chemical ingredients of modified super-high strength steel is as shown in table 1 in this instance:
Table 1 steel billet is smelted composition (wt%)
Figure BDA0000118653950000031
The instance rolling technological parameter is as shown in table 2:
Table 2 controlled rolling processing parameter
Figure BDA0000118653950000032
Annotate: the H-finished product thickness
Actual quenching technology is as shown in table 3:
Table 3 quenching temperature and soaking time
Steel plate thickness/mm Quenching temperature/℃ Soaking time/min
12 900±20 10
20 900±20 15
40 920±20 30
50 920±20 30
Actual tempering process is as shown in table 4:
Table 4 tempering Heating temperature and soaking time
Steel plate thickness/mm Tempering temperature/℃ Soaking time/min
12 550±10 12
20 540±10 20
40 520±10 40
50 520±10 50
The modified back of steel plate performance statistics value is as shown in table 5:
The modified back of table 5 plate property statistics
Figure BDA0000118653950000041
Annotate: ReH (going up ys), Rm (tensile strength), A (elongation after fracture), AKv (impact) Min~Max/Ave (minimum value~peak/MV)
20mm specification steel plate The experiment results is as shown in table 6:
Table 6 20mm specification steel plate The experiment results
Figure BDA0000118653950000042
40mm specification steel plate The experiment results is as shown in table 6:
Table 7 40mm specification steel plate The experiment results

Claims (3)

1. the modified super-high strength steel of ys 1000MPa level is characterized in that the steel plate chemical ingredients is (weight), C:0.15%~0.20%; Si:0.10%~0.40%; Mn:1.00%~1.50%; Cr:0.30%~0.50%; Mo:0.30%~0.50%; Ni:0.20%~0.50%; B:0.0010%~0.0030%; Nb:0.010%~0.030%; V:0.030%~0.050%; Ti:0.010%~0.020%; Alt:0.030%~0.050%; P :≤0.020%; S :≤0.010%; All the other are Fe and inevitable impurity, carbon equivalent Ceq (%)=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15:0.50~0.60.
2. make the method for the modified super-high strength steel of ys 1000MPa level as claimed in claim 1, comprise composition proportion, converter smelting, external refining, RH vacuum-treat, slab casting, steel billet heating, controlled rolling, quench treatment, temper operation; It is characterized in that: the billet heating temperature span of control: 1160 ℃~1240 ℃; In the modifier treatment process, the quenching temperature scope: 880 ℃~950 ℃, Quenching Soaking Time: 10min~30min; Tempering range: 450 ℃~600 ℃, tempering insulation time: 8min~50min.
3. the modified super-high strength steel of ys 1000MPa level as claimed in claim 1 is characterized in that: the metallographic structure of quenching attitude is a lath martensite, and the metallographic structure of tempering attitude is a tempered sorbite.
CN2011104108026A 2011-12-12 2011-12-12 Hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and production method thereof Pending CN102560274A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104328350A (en) * 2014-11-25 2015-02-04 湖南华菱涟源钢铁有限公司 Hardened and tempered steel with yield strength of 960MPa level and manufacturing method of hardened and tempered steel
CN104561822A (en) * 2014-12-17 2015-04-29 秦皇岛首秦金属材料有限公司 High-strength/toughness extra-thick low-alloy quenched and tempered steel and preparation method thereof
WO2016095721A1 (en) * 2014-12-19 2016-06-23 宝山钢铁股份有限公司 Quenched-tempered high-strength steel with yield strength of 900 mpa to 1000 mpa grade, and manufacturing method therefor
CN107760983A (en) * 2016-08-18 2018-03-06 江苏鼎泰工程材料有限公司 A kind of production method of low-alloy super-strength steel and its casting
WO2018040859A1 (en) * 2016-08-31 2018-03-08 南京钢铁股份有限公司 Large-thickness q960e ultra-high strength steel production method
CN108359899A (en) * 2018-03-27 2018-08-03 本钢板材股份有限公司 A kind of super high strength construction steel BG960 and preparation method
CN111748732A (en) * 2019-03-28 2020-10-09 宝山钢铁股份有限公司 1000 MPa-grade high-toughness high-magnetism hot-rolled magnetic yoke steel and production method thereof

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CN101451218A (en) * 2007-12-07 2009-06-10 舞阳钢铁有限责任公司 Quenching and tempering type abrasion resistant steel and heat treating method thereof
CN101899630A (en) * 2009-05-25 2010-12-01 宝山钢铁股份有限公司 Quenching steel plate for engineering machinery with 900MPa-grade yield strength and production method thereof

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Publication number Priority date Publication date Assignee Title
CN101451218A (en) * 2007-12-07 2009-06-10 舞阳钢铁有限责任公司 Quenching and tempering type abrasion resistant steel and heat treating method thereof
CN101899630A (en) * 2009-05-25 2010-12-01 宝山钢铁股份有限公司 Quenching steel plate for engineering machinery with 900MPa-grade yield strength and production method thereof

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104328350A (en) * 2014-11-25 2015-02-04 湖南华菱涟源钢铁有限公司 Hardened and tempered steel with yield strength of 960MPa level and manufacturing method of hardened and tempered steel
CN104561822A (en) * 2014-12-17 2015-04-29 秦皇岛首秦金属材料有限公司 High-strength/toughness extra-thick low-alloy quenched and tempered steel and preparation method thereof
CN104561822B (en) * 2014-12-17 2016-06-22 秦皇岛首秦金属材料有限公司 A kind of high-strength tenacity spy's thick low-alloy quenched and tempered steel and preparation method thereof
WO2016095721A1 (en) * 2014-12-19 2016-06-23 宝山钢铁股份有限公司 Quenched-tempered high-strength steel with yield strength of 900 mpa to 1000 mpa grade, and manufacturing method therefor
US20170349966A1 (en) * 2014-12-19 2017-12-07 Baoshan Iron & Steel Co., Ltd. Quenched-tempered high-strength steel with yield strength of 900 mpa to 1000 mpa grade, and manufacturing method therefor
CN107760983A (en) * 2016-08-18 2018-03-06 江苏鼎泰工程材料有限公司 A kind of production method of low-alloy super-strength steel and its casting
CN107760983B (en) * 2016-08-18 2019-03-01 江苏鼎泰工程材料有限公司 A kind of production method of low-alloy super-strength steel and its casting
WO2018040859A1 (en) * 2016-08-31 2018-03-08 南京钢铁股份有限公司 Large-thickness q960e ultra-high strength steel production method
CN108359899A (en) * 2018-03-27 2018-08-03 本钢板材股份有限公司 A kind of super high strength construction steel BG960 and preparation method
CN111748732A (en) * 2019-03-28 2020-10-09 宝山钢铁股份有限公司 1000 MPa-grade high-toughness high-magnetism hot-rolled magnetic yoke steel and production method thereof

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Application publication date: 20120711