CN108531811A - A kind of preparation method of casting TRIP steel strips - Google Patents

A kind of preparation method of casting TRIP steel strips Download PDF

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Publication number
CN108531811A
CN108531811A CN201810465227.1A CN201810465227A CN108531811A CN 108531811 A CN108531811 A CN 108531811A CN 201810465227 A CN201810465227 A CN 201810465227A CN 108531811 A CN108531811 A CN 108531811A
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casting
steel
preparation
trip
trip steel
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CN108531811B (en
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袁国
王鹤松
康健
曹光明
李成刚
张元祥
王国栋
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Northeastern University China
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Northeastern University China
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • 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
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C21D2211/001—Austenite
    • 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
    • C21D2211/002—Bainite
    • 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

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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)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)

Abstract

The invention belongs to steel alloy material technical fields, and in particular to a kind of preparation method of casting TRIP steel strips.Technical scheme is as follows：A kind of preparation method of casting TRIP steel strips, includes the following steps：(1) melting molten steel；(2) tundish is poured into；(3) Bu Liubao is poured into；(4) twin-roll thin strip continuous casting equipment casting is utilized；(5) Cast Strip a time hot rolling；(6) first air-cooled then ultrafast cold after hot rolling；(7) it crimps.The problems such as preparation method of casting TRIP steel strips provided by the invention, the production procedure that solves traditional analysis of producing hot rolled TRIP is long, of high cost and energy consumption is big.

Description

A kind of preparation method of casting TRIP steel strips
Technical field
The invention belongs to steel alloy material technical fields, and in particular to a kind of preparation method of casting TRIP steel strips.
Background technology
Steel industry current steel total output in China's is bigger, resource, the energy used in steel plant's production steel material Consumption is big, and discharge is high, causes environmental pollution serious, and production and the cost of investment height of steel material.Based on world energy sources, money The immense pressure in source and environmental protection, steel industry need the direction towards energy-saving and environmental protection, low cost to develop.It would therefore be highly desirable into Row autonomous innovation, developing low-cost, the greenization steel material production technology of low energy consumption.
Twin-roll thin strip continuous casting be a low cost, low energy consumption, short route greenization process for producing steel and iron.It is with liquid Molten steel is raw material, and using the opposite casting roll in two direction of rotation as crystallizer, liquid molten steel is coagulated after pouring into casting roll by roll gap Consolidate and be molded, directly prepare thickness be 1~5mm Thin Strip Steel.Therefore, with traditional strip production technology (slab CC machine, Sheet blank continuous casting) it compares, twin-roll thin strip continuous casting technology can save conticaster, heating furnace, roughing mills and the essence of traditional process The production equipments such as milling train group.Thin Strip Steel is produced using twin-roll thin strip continuous casting technology, Thin Strip Steel continuous production may be implemented, one is poured It is secondary to produce a whole steel band, so that liquid molten steel is reduced to the production cost of hot rolling volume switching, and make the work of output strip line Skill design arrangement is more compact, and output strip line can foreshorten to 50m.Therefore, twin-roll thin strip continuous casting technological development is made full use of Steel products are produced, to promoting China's steel industry energy-saving and emission-reduction and technological innovation, promote Iron and Steel Enterprises in China transition and upgrade tool There is very important meaning.
Phase change induction plasticity (TRIP) steel is a kind of important advanced high-strength steel, is organized mainly by ferrite, austenite It is formed with bainite.There is TRIP steel preferable intensity and elongation percentage to combine, and can meet the needs of automobile associated structural component, Therefore certain extensive use is obtained in automobile industry.The production procedure of traditional analysis of producing hot rolled TRIP is：Smelting molten steel → continuous casting → casting Base is heated at high temperature and keeps the temperature → roughing → finish rolling → control cooling → curling.This traditional mode of production flow production analysis of producing hot rolled TRIP Production line is longer, and energy consumption is big, and production and cost of investment are relatively high.In addition, the analysis of producing hot rolled TRIP that traditional process is produced There can be the apparent overproof problem of thickness end to end, be used to influence user.
Invention content
The present invention provides a kind of preparation method of casting TRIP steel strips, solves the production procedure of traditional analysis of producing hot rolled TRIP The problems such as long, of high cost and energy consumption is big.
Technical scheme is as follows：
A kind of preparation method of casting TRIP steel strips, includes the following steps：
(1) melting molten steel, molten steel composition are by mass percentage：C 0.15~0.25%, Mn 1~2.5%, 0.5% ＜ Si ＜ 1.8%, Al ＜ 1.5%, Nb ＜ 0.1%, S<0.002%, P<0.002%, O<0.002%, N<0.003%, surplus is Fe；
(2) molten steel is poured into tundish, then pours into Bu Liubao from tundish, finally pours into double roller from Bu Liubao again In thin strap continuous casting equipment, control molten bath upper surface molten steel the degree of superheat be 10~40 DEG C, through casting obtain thickness be 1.2~ The Cast Strip of 3.0mm；
(3) Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling acquisition strip, start rolling temperature is 1000~1250 DEG C, hot rolling overall reduction is 10%~30%, and finishing temperature is 900~1150 DEG C；
(4) after strip goes out hot-rolling mill, 680~850 DEG C are first air-cooled to；Then utilize ultrafast cooling system with 80~120 DEG C/s Belt steel temperature is cooled to 380~500 DEG C, is crimped later, casting TRIP steel strips are obtained.
The preparation method of the casting TRIP steel strips, preferred embodiment are the thickness of the casting TRIP steel strips For 0.85~2.1mm.
The preparation method of the casting TRIP steel strips, preferred embodiment be, the casting TRIP steel strips it is micro- It is organized as：The ferrite of volume fraction 20~50%, the retained austenite of volume fraction 10~20%, remaining is bainite.
The preparation method of the casting TRIP steel strips, preferred embodiment are the tension of the casting TRIP steel strips Intensity is 700~1050MPa, and elongation after fracture is 18~40%.
Beneficial effects of the present invention are：Twin-roll thin strip continuous casting is utilized in the preparation process of the casting TRIP steel strips of the present invention Technology, the preparation method save the production equipments such as conticaster, heating furnace, roughing mills and mm finishing mill unit, have it is energy saving, green, The feature of environmental protection, and the efficient quickly continuous preparation of casting TRIP steel strips may be implemented in preparation method of the present invention, One is poured and time can produce a whole casting TRIP steel strips, makes molten steel to the production cost reduction of hot rolling volume switching, production line Technological design arrangement it is more compact, output strip line can foreshorten to 50m.And the production line of traditional analysis of producing hot rolled TRIP is longer, And must molten steel be first first casting continuously to form strand in other workshop, then by strand reheat and long-time soak after again Roughing and finish rolling are carried out, entire course of hot rolling rolling mill practice is complicated, the time is long.
Specific implementation mode
In specific implementation process, molten steel of the invention is poured into from Bu Liubao in twin-roll thin strip continuous casting equipment, is by cloth stream Molten steel in packet pours into formation molten bath in the cavity of two opposite casting rolls of direction of rotation and side seal board composition, and molten steel is through casting roll Roll gap is solidified and is exported.
Intensity and the test accepted standard of elongation percentage are GB/T228.1-2010 in the embodiment of the present invention, stretch the mark of sample Away from for 50mm, test at room temperature, rate of extension 2mm/min.
Embodiment 1
Melting molten steel, ingredient are containing C 0.21%, Mn 1.6%, Si 0.5%, Al 1.5%, Nb by mass percentage 0.04%, S 0.002%, P 0.001%, O 0.0012%, N 0.0011%, surplus Fe；
Molten steel is poured into tundish, then pours into Bu Liubao from tundish, it is thin finally from Bu Liubao to pour into double roller again In band continuous casting installation for casting, the degree of superheat for controlling the molten steel of molten bath upper surface is 20 DEG C, and the Cast Strip that thickness is 3.0mm is obtained through casting；
Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling acquisition strip, start rolling temperature is 1250 DEG C, and hot rolling is total Drafts is 30%, and finishing temperature is 1150 DEG C；
Strip, which goes out, is first air-cooled to 820 DEG C after hot-rolling mill；Then belt steel temperature is cooled down with 100 DEG C/s using ultrafast cooling system It is crimped to 400 DEG C, obtains casting TRIP steel strips：Its thickness is 2.1mm；Tissue is mainly the iron element of volume fraction 45% The retained austenite of body, volume fraction 20%, remaining is bainite；Tensile strength is 750MPa, elongation after fracture 40%.
Embodiment 2
Melting molten steel, ingredient are containing C 0.25%, Mn 1%, Si 1.3%, Al 1%, Nb by mass percentage 0.06%, S 0.001%, P 0.002%, O 0.002%, N 0.001%, surplus Fe；
Molten steel is poured into tundish, then pours into Bu Liubao from tundish, it is thin finally from Bu Liubao to pour into double roller again In band continuous casting installation for casting, the degree of superheat for controlling the molten steel of molten bath upper surface is 40 DEG C, and the Cast Strip that thickness is 2mm is obtained through casting；
Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1170 DEG C, and hot rolling overall reduction is 20%, finishing temperature is 1000 DEG C；
Strip, which goes out, is first air-cooled to 700 DEG C after hot-rolling mill；Then belt steel temperature is cooled down with 80 DEG C/s using ultrafast cooling system It is crimped to 500 DEG C, obtains casting TRIP steel strips：Its thickness is 1.6mm；Tissue is mainly the iron element of volume fraction 30% The retained austenite of body, volume fraction 14%, remaining is bainite；Tensile strength is 800MPa, elongation after fracture 30%.
Embodiment 3
Melting molten steel, ingredient are containing C 0.22%, Mn 2.5%, Si 1.8%, Al 0.8%, Nb by mass percentage 0.1%, S 0.001%, P 0.0014%, O 0.0012%, N 0.003%, surplus Fe；
Molten steel is poured into tundish, then pours into Bu Liubao from tundish, it is thin finally from Bu Liubao to pour into double roller again In band continuous casting installation for casting, the degree of superheat for controlling the molten steel of molten bath upper surface is 10 DEG C, and the Cast Strip that thickness is 1.2mm is obtained through casting；
Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1060 DEG C, and hot rolling overall reduction is 30%, finishing temperature is 960 DEG C；
Strip, which goes out, is first air-cooled to 850 DEG C after hot-rolling mill；Then belt steel temperature is cooled down with 120 DEG C/s using ultrafast cooling system It is crimped to 380 DEG C, obtains casting TRIP steel strips：Its thickness is 0.85mm；Tissue is mainly the iron of volume fraction 20% The retained austenite of ferritic, volume fraction 10%, remaining is bainite；Tensile strength is 1050MPa, and elongation after fracture is 18%.
Embodiment 4
Melting molten steel, ingredient are containing C 0.15%, Mn 2%, Si 1.5%, Al 0.3%, Nb by mass percentage 0.03%, S 0.0012%, P 0.0012%, O 0.001%, N 0.003%, surplus Fe；
Molten steel is poured into tundish, then pours into Bu Liubao from tundish, it is thin finally from Bu Liubao to pour into double roller again In band continuous casting installation for casting, the degree of superheat for controlling the molten steel of molten bath upper surface is 20 DEG C, and the Cast Strip that thickness is 2.2mm is obtained through casting；
Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1000 DEG C, and hot rolling overall reduction is 10%, finishing temperature is 900 DEG C；
Strip, which goes out, is first air-cooled to 750 DEG C after hot-rolling mill；Then belt steel temperature is cooled down with 95 DEG C/s using ultrafast cooling system It is crimped to 440 DEG C, obtains casting TRIP steel strips：Its thickness is 2mm；Tissue is mainly the iron element of volume fraction 26% The retained austenite of body, volume fraction 14%, remaining is bainite；Tensile strength is 900MPa, elongation after fracture 25%.
Embodiment 5
Melting molten steel, ingredient be by mass percentage containing C 0.17%, Mn 1.6%, Si 1.4%, Al 0.005%, Nb 0.07%, S 0.001%, P 0.0012%, O 0.0013%, N 0.0021%, surplus Fe；
Molten steel is poured into tundish, then pours into Bu Liubao from tundish, it is thin finally from Bu Liubao to pour into double roller again In band continuous casting installation for casting, the degree of superheat for controlling the molten steel of molten bath upper surface is 22 DEG C, and the Cast Strip that thickness is 1.8mm is obtained through casting；
Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling, start rolling temperature is 1000 DEG C, and hot rolling overall reduction is 10%, finishing temperature is 910 DEG C；
Strip, which goes out, is first air-cooled to 680 DEG C after hot-rolling mill；Then belt steel temperature is cooled down with 90 DEG C/s using ultrafast cooling system It is crimped to 420 DEG C, obtains casting TRIP steel strips：Its thickness is 1.6mm；Tissue is mainly the iron element of volume fraction 50% The retained austenite of body, volume fraction 11%, remaining is bainite；Tensile strength is 700MPa, elongation after fracture 35%.

Claims (4)

1. a kind of preparation method of casting TRIP steel strips, which is characterized in that include the following steps：
(1) melting molten steel, molten steel composition are by mass percentage：C 0.15~0.25%, Mn 1~2.5%, 0.5% ＜ Si ＜ 1.8%, Al ＜ 1.5%, Nb ＜ 0.1%, S<0.002%, P<0.002%, O<0.002%, N<0.003%, surplus Fe；
(2) molten steel is poured into tundish, then pours into Bu Liubao from tundish, finally pours into twin-roll thin strip from Bu Liubao again In continuous casting installation for casting, the degree of superheat for controlling the molten steel of molten bath upper surface is 10~40 DEG C, and it is 1.2~3.0mm to obtain thickness through casting Cast Strip；
(3) Cast Strip is cooled to after start rolling temperature and carries out a time hot rolling acquisition strip, start rolling temperature is 1000~1250 DEG C, heat It is 10%~30% to roll overall reduction, and finishing temperature is 900~1150 DEG C；
(4) after strip goes out hot-rolling mill, 680~850 DEG C are first air-cooled to；Then utilize ultrafast cooling system with 80~120 DEG C/s by band Steel temperature is cooled to 380~500 DEG C, is crimped later, obtains casting TRIP steel strips.
2. the preparation method of casting TRIP steel strips according to claim 1, which is characterized in that the casting TRIP steel is thin The thickness of band is 0.85~2.1mm.
3. the preparation method of casting TRIP steel strips according to claim 1, which is characterized in that the casting TRIP steel is thin The microscopic structure of band is：The ferrite of volume fraction 20~50%, the retained austenite of volume fraction 10~20%, remaining is shellfish Family name's body.
4. the preparation method of casting TRIP steel strips according to claim 1, which is characterized in that the casting TRIP steel is thin The tensile strength of band is 700~1050MPa, and elongation after fracture is 18~40%.
CN201810465227.1A 2018-05-16 2018-05-16 Preparation method of cast-rolled TRIP steel thin strip Active CN108531811B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109518092A (en) * 2018-11-22 2019-03-26 东北大学 The low silicon analysis of producing hot rolled TRIP containing aluminium of high strength and ductility Nb-microalloying and preparation method
CN112296285A (en) * 2020-09-18 2021-02-02 江苏沙钢集团有限公司 Method for improving wrinkles of double-roller cast-rolled thin strip
CN112522571A (en) * 2019-09-19 2021-03-19 宝山钢铁股份有限公司 Method for producing martensite steel strip by twin-roll thin-strip continuous casting

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Publication number Priority date Publication date Assignee Title
JP2006052433A (en) * 2004-08-10 2006-02-23 Nippon Steel Corp Method for producing hot-rolled steel strip having characteristic of trip steel
CN101191174A (en) * 2006-11-20 2008-06-04 宝山钢铁股份有限公司 Hot-rolling phase change induction plasticity steel with 750MPa-level extension strength and preparation method thereof
CN101297049A (en) * 2005-10-25 2008-10-29 Sms迪马格股份公司 Method for producing hot strip with a multiphase structure
CN101550514A (en) * 2009-05-15 2009-10-07 东北大学 Hot-rolling transformation-induced plasticity steel plate and preparation method thereof
CN102586562A (en) * 2012-03-30 2012-07-18 河北钢铁集团有限公司 Production process for shock-proof disaster-relieving hot rolled transformation-induced plasticity (TRIP) steel plates
CN106636931A (en) * 2016-12-30 2017-05-10 北京科技大学 Preparation method of delta-ferrite-containing TRIP (transformation induced plasticity) steel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006052433A (en) * 2004-08-10 2006-02-23 Nippon Steel Corp Method for producing hot-rolled steel strip having characteristic of trip steel
CN101297049A (en) * 2005-10-25 2008-10-29 Sms迪马格股份公司 Method for producing hot strip with a multiphase structure
CN101191174A (en) * 2006-11-20 2008-06-04 宝山钢铁股份有限公司 Hot-rolling phase change induction plasticity steel with 750MPa-level extension strength and preparation method thereof
CN101550514A (en) * 2009-05-15 2009-10-07 东北大学 Hot-rolling transformation-induced plasticity steel plate and preparation method thereof
CN102586562A (en) * 2012-03-30 2012-07-18 河北钢铁集团有限公司 Production process for shock-proof disaster-relieving hot rolled transformation-induced plasticity (TRIP) steel plates
CN106636931A (en) * 2016-12-30 2017-05-10 北京科技大学 Preparation method of delta-ferrite-containing TRIP (transformation induced plasticity) steel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109518092A (en) * 2018-11-22 2019-03-26 东北大学 The low silicon analysis of producing hot rolled TRIP containing aluminium of high strength and ductility Nb-microalloying and preparation method
CN109518092B (en) * 2018-11-22 2020-10-02 东北大学 High-strength high-ductility niobium microalloyed low-silicon aluminum-containing hot-rolled TRIP steel and preparation method thereof
CN112522571A (en) * 2019-09-19 2021-03-19 宝山钢铁股份有限公司 Method for producing martensite steel strip by twin-roll thin-strip continuous casting
CN112296285A (en) * 2020-09-18 2021-02-02 江苏沙钢集团有限公司 Method for improving wrinkles of double-roller cast-rolled thin strip
CN112296285B (en) * 2020-09-18 2022-04-05 江苏沙钢集团有限公司 Method for improving wrinkles of double-roller cast-rolled thin strip

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