CN106868399A - A kind of two-phase TRIP steel strips and preparation method thereof - Google Patents

A kind of two-phase TRIP steel strips and preparation method thereof Download PDF

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Publication number
CN106868399A
CN106868399A CN201710133124.0A CN201710133124A CN106868399A CN 106868399 A CN106868399 A CN 106868399A CN 201710133124 A CN201710133124 A CN 201710133124A CN 106868399 A CN106868399 A CN 106868399A
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trip steel
steel strips
phase trip
rolling
cold
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CN201710133124.0A
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CN106868399B (en
Inventor
袁国
王鹤松
曹光明
李成刚
康健
王国栋
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Northeastern University China
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Northeastern University China
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    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622Continuous 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
    • 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
    • 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
    • C21D8/0236Cold rolling
    • 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
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/001Austenite
    • 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite

Abstract

The invention belongs to steel alloy material technical field, and in particular to a kind of two-phase TRIP steel strips and preparation method thereof.Technical scheme is as follows:A kind of two-phase TRIP steel strips, its composition is by mass percentage C 0.18~0.4%, Mn 1~4%, Si 0.2~2.2%, Al 2~3%, S<0.002%, P<0.003%, N<0.002%, balance of Fe;Its thickness is 0.5~1.2mm, and tissue is made up of ferrite+retained austenite, and tensile strength is 800~1000MPa, and elongation after fracture is 20~40%.The preparation method of the two-phase TRIP steel strips that the present invention is provided is that, using double rod strip continuous casting technologies, production procedure is short, and energy consumption is low, and annealing process is simple.

Description

A kind of two-phase TRIP steel strips and preparation method thereof
Technical field
The invention belongs to steel alloy material technical field, and in particular to a kind of two-phase TRIP steel strip and its preparation side Method.
Background technology
With developing rapidly for automobile industry, the important performance that vehicle safety and lightweight have become automotive material refers to Mark.At present, advanced high-strength steel has become the important feature material of automobile.Phase change induction plasticity (TRIP) steel is a kind of typical case Advanced high-strength steel, combined with preferable intensity and elongation percentage, have been widely used for structural partsof automobiles.The group of TRIP steel Knit and be mainly made up of ferrite, bainite and retained austenite, wherein retained austenite is its important composition phase.It is remaining difficult to understand Family name's body is poor in the stability of room temperature, in certain deformation process, can be to more stable martensite transfor mation, so as to improve The homogeneous deformation ability of material, improves intensity and plasticity, that is, TRIP effects occur.Ferrite is the matrix of TRIP steel, modeling Property it is relatively good, additionally, when ferrite and austenite two-phase temperature range are incubated, ferrite can expand the carbon of itself It is scattered in non-transformed austenite, so as to improve the stability of austenite.Bainite is the hard phase in TRIP steel, can be improved The intensity of TRIP steel, additionally, when steel plate is incubated by bainite transformation temperature, it is possible to use the carbon in bainite is diffused into In non-transformed austenite, so as to improve stabilization of austenite, non-transformed austenite retains to room temperature and forms paralympic.
At present, the traditional mode of production flow of Cold-Rolled TRIP Steel is:Smelt, continuous casting, heating, roughing, finish rolling, pickling, it is cold rolling and Annealing.Wherein Cold-Rolled TRIP Steel annealing process is mainly to directly heat cold-reduced sheet to ferrite+austenite two-phase section temperature and protects Warm certain hour, then it is quickly cooled to bainite transformation temperature isothermal phase change.Cold-Rolled TRIP Steel is prepared using traditional handicraft to produce Process CIMS is long, and energy consumption is big.Additionally, the annealing process of traditional Cold-Rolled TRIP Steel needs to carry out bainite transformation temperature isothermal Phase transformation, increased the complexity of annealing process.
The content of the invention
The present invention provides a kind of two-phase TRIP steel strips and preparation method thereof, and production procedure is short, and energy consumption is low, and lehr attendant Skill is simple.
Technical scheme is as follows:
A kind of two-phase TRIP steel strips, its composition is by mass percentage C 0.18~0.4%, Mn 1~4%, Si 0.2 ~2.2%, Al 2~3%, S<0.002%, P<0.003%, N<0.002%, balance of Fe;Its thickness is 0.5~1.2mm, Tensile strength is 800~1000MPa, and elongation after fracture is 20~40%.
Described two-phase TRIP steel strips, its tissue is made up of ferrite+retained austenite.
A kind of preparation method of above-mentioned two-phase TRIP steel strips, comprises the following steps:
(1) by the composition melting molten steel, then by pouring molten steel to tundish, then twin-roll thin strip is poured into from tundish In continuous casting installation for casting, the Cast Strip that thickness is 1.8~3.0mm is obtained through casting;
(2) being cooled to Cast Strip carries out a time hot rolling after start rolling temperature, start rolling temperature is 1000~1100 DEG C, and hot rolling is total Drafts is 10~30%, and finishing temperature is 900~1000 DEG C, and the hot rolled plate of acquisition is air cooled to 500~650 DEG C and is crimped;
(3) by the hot rolled plate pickling remove iron scale, then carry out it is cold rolling, cold rolling overall reduction be 50~70%, Obtain cold-reduced sheet;
(4) cold-reduced sheet is heated to 750~900 DEG C of insulation 3min~5min, then direct quenching is to room temperature, obtains double Phase TRIP steel strips.
The preparation method of described two-phase TRIP steel strips, wherein the thickness of the hot rolled plate is 1.5~2.4mm;Two-phase The thickness of TRIP steel strips is 0.5~1.2mm.
The tissue characteristic of two-phase TRIP steel strips of the present invention is:The tissue of two-phase TRIP steel of the invention is by ferrite+residual Remaining austenite composition, the tissue (ferrite, bainite and retained austenite) with traditional TRIP steel is dramatically different.Two-phase TRIP The retained austenite volume fraction of steel strip is 15~24%, and the retained austenite of enough volume fractions sends out in deformation process The stronger TRIP effects of life, so that two-phase TRIP steel strips of the present invention have preferable mechanical property.
The technology of preparing feature of two-phase TRIP steel strips of the present invention is:What the manufacture of two-phase TRIP steel strips of the present invention was used It is twin-roll thin strip continuous casting technology.Twin-roll thin strip continuous casting technology be using liquid molten steel as cast raw material, it is opposite using direction of rotation Used as crystallizer, liquid molten steel between casting roll is formed molten bath and is solidified by casting roll roll gap the casting roll of two by basket pouring And be molded, directly prepare the technology of the band that thickness is 1~5mm.Can save traditional normal using twin-roll thin strip continuous casting technology Advise the production equipments such as conticaster, heating furnace, roughing mills and the mm finishing mill unit of strip production technology, hence it is evident that reduce output strip line Take up an area length (only 50~60m), be typical energy-saving and environmental protection, the short route technology of low cost in steel products production, therefore Traditional TRIP steel-making process can be solved long, and the big problem of energy consumption.
The annealing process feature of two-phase TRIP steel strips of the present invention is:After ferrite+austenite two-phase section temperature Direct quenching eliminates the bainitic transformation region insulating process of the annealing process of traditional Cold-Rolled TRIP Steel to room temperature, reduces The complexity of preparation technology.
Brief description of the drawings
Fig. 1 is the manufacturing process schematic diagram of two-phase TRIP steel strips of the invention, wherein, 1, ladle, 2, tundish, 3, molten Pond, 4, casting roll, 5, Cast Strip, 6, hot-rolling mill, 7, hot rolled plate, 8, coiling machine, 9, pickling, 10, cold-rolling mill, 11, cold-reduced sheet, 12, move back Fire, 13, two-phase TRIP steel strips;
Fig. 2 is the optical microscope photograph of the two-phase TRIP steel strip microscopic structures of the embodiment of the present invention 1.
Specific embodiment
The casting process of molten steel of the invention, is the steel in tundish 2 by the pouring molten steel in ladle 1 to tundish 2 Water is flowed into by cloth flowing water mouthful and molten bath 3, molten steel warp is formed in the cavity that two opposite casting rolls of direction of rotation and side seal board are constituted The roll gap of casting roll 4 solidifies and derives.
The test accepted standard of intensity and elongation percentage is GB/T228.1-2010 in the embodiment of the present invention, stretches the mark of sample Away from being 50mm, test at room temperature, rate of extension is 2mm/min.
The equipment that observation metallographic structure is used in the embodiment of the present invention is OLYMPUS-BX53M type light microscopes.
Embodiment 1
The chemical composition of two-phase TRIP steel strips is shown in Table 1 in the present embodiment.
The chemical composition of table 1 (wt.%)
Its manufacture method is followed the steps below:
(1) by set component melting molten steel, then it is poured into tundish 2, then twin-roll thin strip continuous casting is poured into from tundish 2 In equipment, it is the Cast Strip 5 of 2.2mm to obtain thickness through casting;
(2) being cooled to Cast Strip 5 carries out a time hot rolling after start rolling temperature, start rolling temperature is 1100 DEG C, under hot rolling stagnation pressure It is 20% to measure, and finishing temperature is 1000 DEG C, and the hot rolled plate 7 of acquisition is air cooled to 650 DEG C and is crimped;
(3) by the pickling of hot rolled plate 7 remove iron scale, then carry out it is cold rolling, cold rolling overall reduction be 50%, obtain 0.9mm thick cold-reduced sheet 11;
(4) cold-reduced sheet 11 is heated to 780 DEG C of insulation 5min, then direct quenching is to room temperature, obtains two-phase TRIP steel strips 13.Its tissue is made up of ferrite+retained austenite, as shown in Figure 2.Its tensile strength is 950MPa, and elongation after fracture is 35%.
Embodiment 2
The chemical composition of two-phase TRIP steel strips is shown in Table 2 in the present embodiment.
The chemical composition of table 2 (wt.%)
Its manufacture method is followed the steps below:
(1) by set component melting molten steel, then it is poured into tundish 2, then twin-roll thin strip continuous casting is poured into from tundish 2 In equipment, it is the Cast Strip 5 of 3.0mm to obtain thickness through casting;
(2) being cooled to Cast Strip 5 carries out a time hot rolling after start rolling temperature, start rolling temperature is 1050 DEG C, under hot rolling stagnation pressure It is 30% to measure, and finishing temperature is 900 DEG C, and the hot rolled plate 7 of acquisition is air cooled to 600 DEG C and is crimped;
(3) by the pickling of hot rolled plate 7 remove iron scale, then carry out it is cold rolling, cold rolling overall reduction be 70%, obtain 0.6mm thick cold-reduced sheet 11;
(4) cold-reduced sheet 11 is heated to 750 DEG C of insulation 3min, then direct quenching is to room temperature, obtains two-phase TRIP steel strips 13.Its tissue is made up of ferrite+retained austenite.Its tensile strength is 990MPa, and elongation after fracture is 25%.
Embodiment 3
The chemical composition of two-phase TRIP steel strips is shown in Table 3 in the present embodiment.
The chemical composition of table 3 (wt.%)
Its manufacture method is followed the steps below:
(1) by set component melting molten steel, then it is poured into tundish 2, then twin-roll thin strip continuous casting is poured into from tundish 2 In equipment, it is the Cast Strip 5 of 1.8mm to obtain thickness through casting;
(2) being cooled to Cast Strip 5 carries out a time hot rolling after start rolling temperature, start rolling temperature is 1000 DEG C, under hot rolling stagnation pressure It is 10% to measure, and finishing temperature is 900 DEG C, and the hot rolled plate 7 of acquisition is air cooled to 550 DEG C and is crimped;
(3) by the pickling of hot rolled plate 7 remove iron scale, then carry out it is cold rolling, cold rolling overall reduction be 70%, obtain 0.5mm thick cold-reduced sheet 11;
(4) cold-reduced sheet 11 is heated to 900 DEG C of insulation 5min, then direct quenching is to room temperature, obtains two-phase TRIP steel strips 13.Its tissue is made up of ferrite+retained austenite, and its tensile strength is 1000MPa, and elongation after fracture is 20%.
Embodiment 4
The chemical composition of two-phase TRIP steel strips is shown in Table 4 in the present embodiment.
The chemical composition of table 4 (wt.%)
Its manufacture method is followed the steps below:
(1) by set component melting molten steel, then it is poured into tundish 2, then twin-roll thin strip continuous casting is poured into from tundish 2 In equipment, it is the Cast Strip 5 of 2.7mm to obtain thickness through casting;
(2) being cooled to Cast Strip 5 carries out a time hot rolling after start rolling temperature, start rolling temperature is 1000 DEG C, under hot rolling stagnation pressure It is 10% to measure, and finishing temperature is 900 DEG C, and the hot rolled plate 7 of acquisition is air cooled to 550 DEG C and is crimped;
(3) by the pickling of hot rolled plate 7 remove iron scale, then carry out it is cold rolling, cold rolling overall reduction be 50%, obtain 1.2mm thick cold-reduced sheet 11;
(4) cold-reduced sheet 11 is heated to 820 DEG C of insulation 5min, then direct quenching is to room temperature, obtains two-phase TRIP steel strips 13.Its tissue is made up of ferrite+retained austenite, and its tensile strength is 800MPa, and elongation after fracture is 40%.

Claims (4)

1. a kind of two-phase TRIP steel strips, it is characterised in that its composition is by mass percentage C 0.18~0.4%, Mn 1~ 4%, Si 0.2~2.2%, Al 2~3%, S<0.002%, P<0.003%, N<0.002%, balance of Fe;Its thickness is 0.5~1.2mm, tensile strength is 800~1000MPa, and elongation after fracture is 20~40%.
2. two-phase TRIP steel strips according to claim 1, it is characterised in that its tissue is by ferrite+retained austenite Composition.
3. a kind of preparation method of two-phase TRIP steel strips as claimed in claim 1 or 2, it is characterised in that including following step Suddenly:
(1) by the composition melting molten steel, then by pouring molten steel to tundish, then twin-roll thin strip continuous casting is poured into from tundish In equipment, the Cast Strip that thickness is 1.8~3.0mm is obtained through casting;
(2) being cooled to Cast Strip carries out a time hot rolling after start rolling temperature, start rolling temperature is 1000~1100 DEG C, under hot rolling stagnation pressure It is 10~30% to measure, and finishing temperature is 900~1000 DEG C, and the hot rolled plate of acquisition is air cooled to 500~650 DEG C and is crimped;
(3) by the hot rolled plate pickling remove iron scale, then carry out it is cold rolling, cold rolling overall reduction be 50~70%, obtain Cold-reduced sheet;
(4) cold-reduced sheet is heated to 750~900 DEG C of insulation 3min~5min, then direct quenching is to room temperature, obtains two-phase TRIP steel strips.
4. the preparation method of two-phase TRIP steel strips according to claim 3, it is characterised in that the thickness of the hot rolled plate It is 1.5~2.4mm;The thickness of two-phase TRIP steel strips is 0.5~1.2mm.
CN201710133124.0A 2017-03-08 2017-03-08 A kind of two-phase TRIP steel strips and preparation method thereof Active CN106868399B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107815593A (en) * 2017-11-06 2018-03-20 东北大学 A kind of economical high-aluminum low-silicon TRIP steel of automobile using and preparation method thereof
CN108060355A (en) * 2017-11-23 2018-05-22 东北大学 A kind of Steel material and preparation method thereof
CN108546881A (en) * 2018-05-16 2018-09-18 东北大学 A kind of preparation method of no yield point elongation cold rolling medium managese steel strip
CN108655354A (en) * 2018-06-07 2018-10-16 东北大学 A kind of short flow process of high strength and ductility medium managese steel strip
CN109338236A (en) * 2018-04-18 2019-02-15 江苏沙钢集团有限公司 A kind of easy welding structural carbon steel and its manufacturing method based on thin-belt casting rolling

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103361547A (en) * 2012-03-30 2013-10-23 鞍钢股份有限公司 Production method of ultrahigh strength steel plate for cold forming and steel plate
CN106244924A (en) * 2016-08-31 2016-12-21 东北大学 A kind of cold rolling quenching ductile steel and preparation method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103361547A (en) * 2012-03-30 2013-10-23 鞍钢股份有限公司 Production method of ultrahigh strength steel plate for cold forming and steel plate
CN106244924A (en) * 2016-08-31 2016-12-21 东北大学 A kind of cold rolling quenching ductile steel and preparation method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107815593A (en) * 2017-11-06 2018-03-20 东北大学 A kind of economical high-aluminum low-silicon TRIP steel of automobile using and preparation method thereof
CN108060355A (en) * 2017-11-23 2018-05-22 东北大学 A kind of Steel material and preparation method thereof
CN108060355B (en) * 2017-11-23 2019-12-27 东北大学 Steel material and preparation method thereof
CN109338236A (en) * 2018-04-18 2019-02-15 江苏沙钢集团有限公司 A kind of easy welding structural carbon steel and its manufacturing method based on thin-belt casting rolling
CN108546881A (en) * 2018-05-16 2018-09-18 东北大学 A kind of preparation method of no yield point elongation cold rolling medium managese steel strip
CN108655354A (en) * 2018-06-07 2018-10-16 东北大学 A kind of short flow process of high strength and ductility medium managese steel strip

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