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CN105603306A - Dual-phase steel with transformation induced plasticity characteristic and production method thereof - Google Patents

Dual-phase steel with transformation induced plasticity characteristic and production method thereof Download PDF

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Publication number
CN105603306A
CN105603306A CN201610048034.7A CN201610048034A CN105603306A CN 105603306 A CN105603306 A CN 105603306A CN 201610048034 A CN201610048034 A CN 201610048034A CN 105603306 A CN105603306 A CN 105603306A
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Prior art keywords
phase steel
production method
dual
als
chemical composition
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Pending
Application number
CN201610048034.7A
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Chinese (zh)
Inventor
夏明生
于世川
杨晓江
刘立学
杜雁冰
李梦英
马德刚
杨丽芳
张茜
王健
李桂兰
刘春雨
关淑巧
李娜
解鸽
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Tangshan Iron and Steel Group Co Ltd
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Tangshan Iron and Steel Group Co Ltd
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Priority to CN201610048034.7A priority Critical patent/CN105603306A/en
Publication of CN105603306A publication Critical patent/CN105603306A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0242—Flattening; Dressing; Flexing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention discloses dual-phase steel with the transformation induced plasticity characteristic, and a production method thereof. The dual-phase steel is prepared from, by mass, 0.07-0.12% of C, 1.5-2.5% of Mn, smaller than or equal to 0.005% of S, smaller than or equal to 0.010% of P, smaller than or equal to 1.5% of Si, 0.03-1.0% of Als, smaller than or equal to 50 ppm of N and the balance Fe and inevitable impurities. The production process includes the procedures of hot rolling, cold rolling, annealing and smoothing. The strength level of the produced dual-phase steel subjected to cold rolling is 780 MPa or above, the structure obtained at the room temperature is ferrite, martensite and 5-10% of residual austenite, and the finished product has the combination of high strength and plasticity, and is used for machining and manufacturing anti-collision pieces and reinforcing pieces in automobile parts.

Description

A kind of dual phase steel and production method thereof with phase-change induced plastic feature
Technical field
The invention belongs to automobile cold-rolled high-strength steel sheet technical field, relate in particular to a kind of dual phase steel and production method thereof with phase-change induced plastic feature.
Background technology
Reach in order to meet the deadweight of reduction body of a motor car the object that reduces energy resource consumption, the security performance that simultaneously ensures vehicle body can not reduce, in Automobile Body Design, adopt more and more high strength steel, especially advanced high-strength steel, wherein dual phase steel is because good performances such as having low yield strength, high-tensile and high initial manufacture hardening rate is widely used in auto parts and components are produced. At present, production about dual phase steel is also very ripe, has also in succession developed different intensity ranks, but is conventionally difficult to realize the good combination of intensity and plasticity, this patent will be devoted to develop tensile strength more than 780MPa, and have the dual phase steel of good forming property.
Summary of the invention
The object of the invention is to provide a kind of dual phase steel production method with phase-change induced plastic feature.
For solving the problems of the technologies described above, the present invention takes following technical scheme: a kind of dual phase steel with phase-change induced plastic feature, its chemical composition mass percent is as follows: C:0.07～0.12%, Mn:1.5～2.5%, S≤0.005%, P≤0.010%, Si≤1.5%, Als:0.03～1.0%, N≤50ppm, all the other are Fe and inevitable impurity.
Its chemical composition mass percent of the present invention is as follows: C:0.10%, and Mn:1.7%, S:0.005%, P:0.008%, Si:1.2%, Als:0.6%, N:40ppm, all the other are Fe and inevitable impurity.
Its chemical composition mass percent of the present invention is as follows: C:0.12%, and Mn:2.0%, S:0.005%, P:0.010%, Si:0%, Als:1.0%, N:50ppm, all the other are Fe and inevitable impurity.
Its chemical composition mass percent of the present invention is as follows: C:0.09%, and Mn:2.5%, S:0.004%, P:0.006%, Si:0.8%, Als:0.7%, N:38ppm, all the other are Fe and inevitable impurity.
In this dual phase steel matrix of the present invention, contain 5～10% retained austenite.
The present invention also provides a kind of above-mentioned a kind of dual phase steel production method with phase-change induced plastic feature, and production technology comprises hot rolling, cold rolling, annealing and smooth operation; Adopt the continuous casting billet of following mass percent chemical composition: C:0.07～0.12%, Mn:1.5～2.5%, S≤0.005%, P≤0.010%, Si≤1.5%, Als:0.03～1.0%, N≤50ppm, all the other are Fe and inevitable impurity.
Hot-rolled process of the present invention: 1250～1320 DEG C of the soaking temperatures of strand, soaking time is 25～35min.
Hot-rolled process of the present invention: finishing temperature is 860～880 DEG C, coiling temperature is 550～680 DEG C, adopts the syllogic refrigerating mode of water-cooled, air cooling and water-cooled.
Cold rolled annealed operation of the present invention: cold rolling reduction ratio is 50～70%, annealing operation soaking temperature is 780～820 DEG C, and it is 630～680 DEG C that rapid cooling starts temperature, and aging temp is 250～300 DEG C.
The smooth reduction ratio of smooth operation of the present invention is≤0.5%.
Mentality of designing of the present invention:
C: carbon is solution strengthening element, that material obtains high-intensity guarantee, when carbon content is too low, when in identical critical zone, (ferrite and austenite) heats, austenite content is low, be unfavorable for obtaining high intensity, but carbon content is too high, be unfavorable for the welding performance of material, therefore the design of carbon is more low better on the basis that meets intensity.
Mn: manganese is the element that strongly improves austenite quenching degree, the austenite that contains appropriate Mn can obtain by different rapid cooling final temperatures the tissue of expectation, thereby obtains the product of different performance.
Si: be solution strengthening element, can improve the strength of materials on the one hand, on the other hand, can accelerate carbon to austenite segregation, purify ferrite, thereby improve end properties.
Al: function is similar to Si.
The beneficial effect that adopts technique scheme to produce is: the cold rolled annealed dual phase steel intensity rank that the present invention produces is more than 780MPa, the retained austenite that is organized as ferrite, martensite and 5-10% obtaining under room temperature, finished product has high intensity and plasticity combination, there is phase-change induced plastic feature, there is continuous yield characteristics and good baking and hardening performance, can be used for the processing and manufacturing of anti-striker and reinforcement in auto parts and components.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
The chemical composition content of each embodiment steel grade is in table 1, and product mechanical performance is in table 2, and when tensile property test, tensile sample is parallel to rolling direction, and the gauge length of tensile sample is 80mm.
Embodiment 1
A kind of chemical composition mass percent of the dual phase steel with phase-change induced plastic feature is in table 1, and thickness is 1.0mm.
Production technology comprises hot rolling, cold rolling, annealing and smooth operation. Hot-rolled process: 1280 DEG C of the soaking temperatures of strand, soaking time is 28min; Finishing temperature is 875 DEG C, and coiling temperature is 550 DEG C.
Cold rolled annealed operation: cold rolling reduction ratio is 70%, annealing operation soaking temperature is 780 DEG C, and it is 630 DEG C that rapid cooling starts temperature, and aging temp is 280 DEG C, austenite content 5%. The smooth reduction ratio 0.3% of smooth operation.
Embodiment 2
A kind of chemical composition mass percent of the dual phase steel with phase-change induced plastic feature is in table 1, and thickness is 1.3mm.
Production technology comprises hot rolling, cold rolling, annealing and smooth operation. Hot-rolled process: 1250 DEG C of the soaking temperatures of strand, soaking time is 30min; Finishing temperature is 860 DEG C, and coiling temperature is 680 DEG C.
Cold rolled annealed operation: cold rolling reduction ratio is 55.0%, annealing operation soaking temperature is 820 DEG C, and it is 670 DEG C that rapid cooling starts temperature, and aging temp is 300 DEG C, austenite content 8%. The smooth reduction ratio 0.4% of smooth operation.
Embodiment 3
A kind of chemical composition mass percent of the dual phase steel with phase-change induced plastic feature is in table 1, and thickness is 1.5mm.
Production technology comprises hot rolling, cold rolling, annealing and smooth operation. Hot-rolled process: 1275 DEG C of the soaking temperatures of strand, soaking time is 32min; Finishing temperature is 870 DEG C, and coiling temperature is 620 DEG C.
Cold rolled annealed operation: cold rolling reduction ratio is 50%, annealing operation soaking temperature is 800 DEG C, and it is 660 DEG C that rapid cooling starts temperature, and aging temp is 260 DEG C, austenite content 9%. The smooth reduction ratio 0.4% of smooth operation.
Embodiment 4
A kind of chemical composition mass percent of the dual phase steel with phase-change induced plastic feature is in table 1, and thickness is 1.8mm.
Production technology comprises hot rolling, cold rolling, annealing and smooth operation. Hot-rolled process: 1320 DEG C of the soaking temperatures of strand, soaking time is 25min; Finishing temperature is 865 DEG C, and coiling temperature is 630 DEG C.
Cold rolled annealed operation: cold rolling reduction ratio is 55%, annealing operation soaking temperature is 790 DEG C, and it is 660 DEG C that rapid cooling starts temperature, and aging temp is 250 DEG C, austenite content 7%. The smooth reduction ratio 0.3% of smooth operation.
Embodiment 5
A kind of chemical composition mass percent of the dual phase steel with phase-change induced plastic feature is in table 1, and thickness is 2.0mm.
Production technology comprises hot rolling, cold rolling, annealing and smooth operation. Hot-rolled process: 1290 DEG C of the soaking temperatures of strand, soaking time is 27min; Finishing temperature is 880 DEG C, and coiling temperature is 610 DEG C.
Cold rolled annealed operation: cold rolling reduction ratio is 50.0%, annealing operation soaking temperature is 780 DEG C, and it is 650 DEG C that rapid cooling starts temperature, and aging temp is 290 DEG C, austenite content 8%. The smooth reduction ratio 0.5% of smooth operation.
Embodiment 6
A kind of dual phase steel chemical composition mass percent with phase-change induced plastic feature is in table 1, and thickness is 2.5mm.
Production technology comprises hot rolling, cold rolling, annealing and smooth operation. Hot-rolled process: 1265 DEG C of the soaking temperatures of strand, soaking time is 35min; Finishing temperature is 860 DEG C, and coiling temperature is 650 DEG C.
Cold rolled annealed operation: cold rolling reduction ratio is 58.0%, annealing operation soaking temperature is 800 DEG C, and it is 680 DEG C that rapid cooling starts temperature, and aging temp is 270 DEG C, austenite content 10%. The smooth reduction ratio 0.2% of smooth operation.
Table 1: the chemical composition (wt%) of steel grade
Embodiment C Mn S P Si Als N(ppm)
1 0.10 1.7 0.005 0.008 1.2 0.6 40
2 0.07 1.6 0.003 0.007 1.5 0.03 30
3 0.12 2.0 0.005 0.010 0 1.0 50
4 0.08 1.9 0.002 0.006 0.6 0.8 25
5 0.09 1.5 0.005 0.010 1.2 0.4 34
6 0.09 2.5 0.004 0.006 0.8 0.7 38
Table 2: product mechanical performance

Claims (10)

1. one kind has the dual phase steel of phase-change induced plastic feature, it is characterized in that, its chemical composition mass percent is as follows: C:0.07～0.12%, Mn:1.5～2.5%, S≤0.005%, P≤0.010%, Si≤1.5%, Als:0.03～1.0%, N≤50ppm, all the other are Fe and inevitable impurity.
2. a kind of dual phase steel with phase-change induced plastic feature according to claim 1, it is characterized in that, its chemical composition mass percent is as follows: C:0.10%, Mn:1.7%, S:0.005%, P:0.008%, Si:1.2%, Als:0.6%, N:40ppm, all the other are Fe and inevitable impurity.
3. a kind of dual phase steel with phase-change induced plastic feature according to claim 1, it is characterized in that, its chemical composition mass percent is as follows: C:0.12%, Mn:2.0%, S:0.005%, P:0.010%, Si:0%, Als:1.0%, N:50ppm, all the other are Fe and inevitable impurity.
4. a kind of dual phase steel with phase-change induced plastic feature according to claim 1, it is characterized in that, its chemical composition mass percent is as follows: C:0.09%, Mn:2.5%, S:0.004%, P:0.006%, Si:0.8%, Als:0.7%, N:38ppm, all the other are Fe and inevitable impurity.
5. according to a kind of dual phase steel with phase-change induced plastic feature described in claim 1-4 any one, it is characterized in that, in this dual phase steel matrix, contain 5～10% retained austenite.
6. a kind of dual phase steel production method with phase-change induced plastic feature based on described in claim 1-5 any one, is characterized in that, production technology comprises hot rolling, cold rolling, annealing and smooth operation; Adopt the continuous casting billet of following mass percent chemical composition: C:0.07～0.12%, Mn:1.5～2.5%, S≤0.005%, P≤0.010%, Si≤1.5%, Als:0.03～1.0%, N≤50ppm, all the other are Fe and inevitable impurity.
7. production method according to claim 6, is characterized in that, described hot-rolled process: 1250～1320 DEG C of the soaking temperatures of strand, soaking time is 25～35min.
8. production method according to claim 6, is characterized in that, described hot-rolled process: finishing temperature is 860～880 DEG C, and coiling temperature is 550～680 DEG C, adopts the syllogic refrigerating mode of water-cooled, air cooling and water-cooled.
9. production method according to claim 6, is characterized in that, described cold rolled annealed operation: cold rolling reduction ratio is 50～70%, and annealing operation soaking temperature is 780～820 DEG C, and it is 630～680 DEG C that rapid cooling starts temperature, and aging temp is 250～300 DEG C.
10. production method according to claim 6, is characterized in that, the smooth reduction ratio of described smooth operation is≤0.5%.
CN201610048034.7A 2016-01-25 2016-01-25 Dual-phase steel with transformation induced plasticity characteristic and production method thereof Pending CN105603306A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107794444A (en) * 2017-10-16 2018-03-13 首钢京唐钢铁联合有限责任公司 Carbon-silicon-manganese series ultrahigh-strength cold-rolled dual-phase steel and preparation method thereof
CN108441765A (en) * 2018-04-03 2018-08-24 本钢板材股份有限公司 A kind of cold-rolled transformation induced plasticity and preparation method thereof
CN111607731A (en) * 2020-05-19 2020-09-01 新余钢铁股份有限公司 A cold-rolled dual-phase steel with improved hole-expanding performance and its manufacturing method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004332104A (en) * 2003-04-16 2004-11-25 Jfe Steel Kk High-tensile cold-rolled steel sheet and manufacturing method thereof
CN101280388A (en) * 2008-05-20 2008-10-08 上海大学 Galvanized low-carbon and low-silicon cold-rolled phase-change plastic steel
CN101802233A (en) * 2007-08-15 2010-08-11 蒂森克虏伯钢铁欧洲股份公司 Dual-phase steel, flat steel product produced from such dual-phase steel, and method for producing flat steel product
KR20130110634A (en) * 2012-03-29 2013-10-10 현대제철 주식회사 High strength steel sheet and method for manufacturing the same
CN104862597A (en) * 2015-05-27 2015-08-26 钢铁研究总院 Method for improving elongation of cold-rolled dual-phase steel by utilizing retained austenite

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004332104A (en) * 2003-04-16 2004-11-25 Jfe Steel Kk High-tensile cold-rolled steel sheet and manufacturing method thereof
CN101802233A (en) * 2007-08-15 2010-08-11 蒂森克虏伯钢铁欧洲股份公司 Dual-phase steel, flat steel product produced from such dual-phase steel, and method for producing flat steel product
CN101280388A (en) * 2008-05-20 2008-10-08 上海大学 Galvanized low-carbon and low-silicon cold-rolled phase-change plastic steel
KR20130110634A (en) * 2012-03-29 2013-10-10 현대제철 주식회사 High strength steel sheet and method for manufacturing the same
CN104862597A (en) * 2015-05-27 2015-08-26 钢铁研究总院 Method for improving elongation of cold-rolled dual-phase steel by utilizing retained austenite

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107794444A (en) * 2017-10-16 2018-03-13 首钢京唐钢铁联合有限责任公司 Carbon-silicon-manganese series ultrahigh-strength cold-rolled dual-phase steel and preparation method thereof
CN108441765A (en) * 2018-04-03 2018-08-24 本钢板材股份有限公司 A kind of cold-rolled transformation induced plasticity and preparation method thereof
CN111607731A (en) * 2020-05-19 2020-09-01 新余钢铁股份有限公司 A cold-rolled dual-phase steel with improved hole-expanding performance and its manufacturing method
CN111607731B (en) * 2020-05-19 2021-08-06 新余钢铁股份有限公司 A cold-rolled dual-phase steel with improved hole-expanding performance and its manufacturing method

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Application publication date: 20160525