CN104694816A - Preparation method of high-Al medium manganese steel with strength and ductility product exceeding 30GPa% - Google Patents

Preparation method of high-Al medium manganese steel with strength and ductility product exceeding 30GPa% Download PDF

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Publication number
CN104694816A
CN104694816A CN201510112679.8A CN201510112679A CN104694816A CN 104694816 A CN104694816 A CN 104694816A CN 201510112679 A CN201510112679 A CN 201510112679A CN 104694816 A CN104694816 A CN 104694816A
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steel
strength
temperature
preparation
ductility product
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CN201510112679.8A
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Inventor
宋仁伯
张磊峰
赵超
富强
徐杨
秦帅
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Abstract

The invention provides a preparation method of high-Al medium manganese steel with strength and ductility product exceeding 30GPa%, and belongs to the field of metal materials. The preparation method is that steel plates for an automobile are prepared from the following chemical components in percentage by mass: 0.10 to 0.35% of C, 5.0 to 9.0% of Mn, 4.0 to 7.5% of Al, less than 0.003% of P, less than 0.002% of S, and the balance of Fe and inevitable impurities. The preparation method comprises the steps of preparing raw materials; melting and casting; forging; heating a steel blank to be 1200 DEG C; maintaining the temperature of 1.5h; then rolling at a plurality of times until deformation, wherein the temperature at the beginning of rolling is 1050 to 1100 DEG C, the temperature at the end of rolling is 850 to 900 DEG C, the accumulation deformation is 80 to 85%, and the coiling temperature is 600 to 700 DEG C; performing cold rolling until deformation, wherein the accumulative compression is 65 to 70%; annealing; maintaining the temperature of 860 to 930 DEG C for 0.5 hour; quenching with water, so as to obtain the novel high-Al-content and high strength and ductility product cold rolled steel plate for the automobile, wherein the test steel is of a ferrite-austenite dual-phase structure, and the ferrite is a substrate phase. The strength and ductility product of the cold rolled steel plate is up to 30 to 50GPa%, and the design requirement of the third generation of steel for automobiles is met.

Description

Strength and ductility product is greater than the preparation method of the high Al Medium Manganese Steel of 30GPa%
Technical field
The invention belongs to metal material field, be a kind of automobile cold-rolled steel plate of middle manganese of high Al content, be specifically related to Composition Design and the preparation technology of this low density steel.
Background technology
Along with resource, the energy and environmental problem are increasingly serious, the fuel economy of raising automobile, energy-saving and emission-reduction become the focus sex chromosome mosaicism of China Automobile Industry gradually.In the last few years, countries in the world automobile and iron and steel enterprise have dropped into substantial contribution, numerous and confused development automobile Novel high-strength steel or ultra-high strength steel plate, comprise martensitic steel, CP steel, DP steel, TRIP steel, TWIP steel etc., reduces vehicle weight by reducing steel plate thickness.In addition, since two thousand nine, be also the third generation automobile steel of representative both at home and abroad with Medium Manganese Steel at Devoting Major Efforts To Developing, its strength and ductility product can reach 30GPa%.These steel have excellent comprehensive mechanical property, have certain loss of weight potentiality.
A kind of better thinking is had to be that exploitation integrates the steel plate of low density and high-strong toughness.By adding a certain amount of Al element in steel, on the regulation and control basis of alloying constituent and moulding process, obtain the Novel steam automobile steel sheet possessing high strength, good plasticity.The advantage of this steel is, alleviates the deadweight of automobile under the prerequisite of not sacrificing structural partsof automobiles intensity as far as possible.There is under Fe-Mn-Al-C system low density, high strength steel room temperature the polyphase structure of austenite, austenite+ferrite dual phase tissue or austenite+ferrite+κ appa carbide, there is higher intensity, good plasticity, high work hardening rate, without yield point elongation phenomenon in deformation process.Compared to the high-strength automobile steel of other advanced person, the features such as low density, better obdurability make this kind of steel possess larger DEVELOPMENT PROSPECT and advantage.
Summary of the invention
The present invention, just on the basis of Medium Manganese Steel, adds higher Al content, thus under rational technology controlling and process, have developed the low-density high-strength annealed steel of excellent performance.
Adopt following technical scheme for achieving the above object
In steel, chemical composition (mass percent) is: 0.10% ~ 0.35%C, 5.0% ~ 9.0%Mn, 4.0% ~ 7.5%Al, P<0.003%, S<0.002%, and surplus is Fe and inevitable impurity.The density of test steels is 7.10 ~ 7.50g/cm 3, comparatively pure iron reduces by 5.0% ~ 9.5%.
This invention exploits the preparation method that a kind of strength and ductility product is greater than the high Al Medium Manganese Steel of 30GPa%, its preparation method is as follows:
(1) smelt according to above-mentioned chemical composition, be forged into rectangular slab;
(2) slab is carried out microstructure homogenization process, Heating temperature is 1200 DEG C, insulation 2h;
(3) slab carries out multistage hot deformation distortion at duo mill, start rolling temperature 1050 ~ 1100 DEG C, and finishing temperature remains on 850 ~ 900 DEG C, multi-pass rolling, and ensure its accumulative deflection 80% ~ 85%, rolling terminates rear water-cooled to 600 ~ 700 DEG C and batches;
(4) after solid solution, steel plate carries out cold roller and deformed, and through multi-pass rolling distortion, accumulation draught is 65 ~ 70%; Carry out anneal afterwards, in shrend after 860 ~ 930 DEG C of insulation 0.5h to room temperature.
Cold-rolled steel sheet strength and ductility product of the present invention can reach 30 ~ 50GPa%, meets the design requirements of third generation automobile steel (strength and ductility product > 30GPa%).
The present invention has the following advantages
(1) have excellent comprehensive mechanical property (high-strength and good plasticity), after anneal of the present invention, steel plate has the good combination of intensity and plasticity, has good impact absorption performance.
(2) compared to Medium Manganese Steel representative in third generation automobile steel, the present invention adopts rational alloying element proportioning, with the addition of the lightweight element such as Al, on the basis ensureing steel plate excellent combination mechanical property, reduce steel plate density, weight loss effect is obvious.
(3) compared to high manganese TWIP steel, austenite Fe-Mn-Al-C steel, interalloy element of the present invention is lower, and carbon equivalent is lower, and forming property is good, is beneficial to steel plate and carries out subsequent production and welding assembly.
(4) in Composition Design of the present invention without the need to adding the expensive alloying elements such as Cr, Ni, Mo, Nb, reduce actual industrial production cost and difficulty, meet the objective demand of automobile industry lightweight and low cost.
Accompanying drawing explanation
Accompanying drawing 1 is automotive sheet preparation process of the present invention.
Accompanying drawing 2 is a kind of low density of the present invention, high tough automotive sheet preparation technology schematic diagram.
Accompanying drawing 3 is steel plate typical case ferrite+austenitic duplex tissues (metallograph) after the present invention anneals.
Specific implementation method
Alloy element action is summarized as follows:
C element, as strong austenizer, expands and stable austenite phase region, and plays solution strengthening effect, ensures the mechanical property of steel.The increase of C content is conducive to improving the austenite content in steel, make it obtain good obdurability, but too high C content will affect its welding property, and be unfavorable for that Automobile Welding will be assembled.Mn, as one of austenitizing alloying element main in steel, can expand γ phase region, stable austenite tissue, plays solution strengthening effect simultaneously.Al is lightweight element important in steel and strong ferritisey, obviously can reduce density of material, and increases ferritic phase content.A certain amount of aluminium can significantly improve the Deformation Resistance of steel, improves the solidity to corrosion of steel, and postpones the Dynamic cracking of material.Meanwhile, Al can significantly improve the stacking fault energy of steel, changes its deformation mechanism.But it is pointed out that in smelting process, Al melting loss of elements is serious, should note the rational proportion of element.P, S are the harmful element in steel, easily cause the brittle rupture of steel, need the content strictly controlling phosphorus in steel, sulphur in smelting process.
Smelted four stove steel in laboratory environments, its chemical composition (mass percent) is as shown in table 1.
Table 1 test steels chemical composition (wt.%)
Grade of steel C Mn Al P S Fe
0.18 6.1 5.2 <0.003 <0.002 Bal.
0.18 7.9 5.0 <0.003 <0.002 Bal.
0.22 8.3 6.9 <0.003 <0.002 Bal.
0.28 5.9 6.7 <0.003 <0.002 Bal.
Concrete implementing process is as follows: be forged to hot rolling technology and provide blank, eliminate component segregation simultaneously, removes shrinkage cavity, the defect such as loose; Steel billet is incubated 1.5h at 1200 DEG C, carries out microstructure homogenization process.Experimentally mill capacity, design outgoing gauge is 3.2mm, and hot rolling start rolling temperature is 1050 ~ 1100 DEG C, and finishing temperature is 850 ~ 900 DEG C, carries out 6 passes, and setting coiling temperature is 600 ~ 700 DEG C.
Carry out cold roller and deformed to steel plate after solution treatment, design rolling thickness is 1.0mm, according to mill capacity, cold roller and deformed through 8 passages; Carry out anneal afterwards, annealing process selects shrend to 200 ~ 300 DEG C after 1000 DEG C of insulation 10 ~ 15min, and air cooling, to room temperature, finally obtains austenite+ferrite dual phase tissue.The mechanical property record of test steels is as following table 2.
Table 2 test steels mechanical property table
To sum up, the strength and ductility product of test steels is all greater than 30GPa%.Under this component system, the residual austenite content (volume fraction) of test steels is 25% ~ 45%, and excellent comprehensive mechanical property depends on the TRIP effect that residual austenite occurs in deformation process and TWIP effect.

Claims (4)

1. a strength and ductility product is greater than the preparation method of the high Al Medium Manganese Steel of 30GPa%, it is characterized in that chemical composition mass percent is: 0.10% ~ 0.35%C, 5.0% ~ 9.0%Mn, 4.0% ~ 7.5%Al, P<0.003%, S<0.002%, surplus is Fe and inevitable impurity, and the density of test steels is 7.10 ~ 7.50g/cm 3;
Concrete preparation process is as follows:
(1) smelt according to above-mentioned alloying constituent system, and casting ingot is forged into slab;
(2) slab is carried out hot rolling; Heating temperature is 1200 DEG C, insulation carry out microstructure homogenization process, through multi-pass rolling distortion, cumulative deformation 80% ~ 85%, coiling temperature 600 ~ 700 DEG C;
(3) undertaken cold rolling by steel plate: according to mill capacity, through multi-pass rolling distortion, accumulation draught is 65 ~ 70%; After carrying out anneal, insulation to cold-rolled steel sheet afterwards, shrend is to room temperature.
2. strength and ductility product according to claim 1 is greater than the preparation method of the high Al Medium Manganese Steel of 30GPa%, it is characterized in that: the hot rolling heat holding time described in step (2) is 1.5h; The start rolling temperature of hot rolling is 1050 ~ 1100 DEG C, and finishing temperature is 850 ~ 900 DEG C, and coiling temperature is 600 ~ 700 DEG C.
3. strength and ductility product according to claim 1 is greater than the preparation method of the high Al Medium Manganese Steel of 30GPa%, it is characterized in that: the cold-rolled steel sheet annealing temperature described in step (3) is at 860 ~ 930 DEG C, and soaking time is 0.5h.
4. strength and ductility product according to claim 1 is greater than the preparation method of the high Al Medium Manganese Steel of 30GPa%, it is characterized in that cold-rolled steel sheet strength and ductility product can reach 30 ~ 50GPa%, meet the design requirements of third generation automobile steel (strength and ductility product > 30GPa%).
CN201510112679.8A 2015-03-13 2015-03-13 Preparation method of high-Al medium manganese steel with strength and ductility product exceeding 30GPa% Pending CN104694816A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104928569A (en) * 2015-06-30 2015-09-23 宝山钢铁股份有限公司 800MPa grade high-ductility low-density steel and manufacturing method thereof
CN104946973A (en) * 2015-07-15 2015-09-30 东北大学 High-strength high-toughness and high-plasticity low-carbon medium-manganese medium-thickness plate and manufacturing method thereof
CN106086658A (en) * 2016-06-20 2016-11-09 上海大学 In a kind of high intensity, carbon is containing chromium low manganese lightweight steel and preparation method
CN106399841A (en) * 2016-11-18 2017-02-15 扶绥县科学技术情报研究所 Production method for ultrafine-granularity steel material high in corrosion resistance
CN106636915A (en) * 2016-11-18 2017-05-10 扶绥县科学技术情报研究所 Production method improving mechanical properties of steel material
CN106756569A (en) * 2016-11-18 2017-05-31 扶绥县科学技术情报研究所 Improve the production method of ferrous materials intensity
CN106756570A (en) * 2016-11-18 2017-05-31 扶绥县科学技术情报研究所 The high-ductility steel iron material production method of ultra-fine grain
CN106756571A (en) * 2016-11-18 2017-05-31 扶绥县科学技术情报研究所 The High-strength steel material producing method of ultra-fine grain
CN106811690A (en) * 2017-01-17 2017-06-09 北京科技大学 A kind of preparation method of low-density lightweight steel
CN107794452A (en) * 2016-08-30 2018-03-13 宝山钢铁股份有限公司 A kind of thin strap continuous casting superelevation strength and ductility product continuously surrenders automobile steel and its manufacture method
CN108018494A (en) * 2017-11-30 2018-05-11 安徽工业大学工商学院 A kind of production method for the annealing process and low density steel for improving the strong plasticity of low density steel
CN108396244A (en) * 2018-06-01 2018-08-14 东北大学 Manganese High-aluminum low-density steel and preparation method thereof in a kind of cold rolling
CN108728752A (en) * 2018-06-28 2018-11-02 东北大学 A kind of low-density cold rolling medium managese steel plate and preparation method thereof
WO2019185108A1 (en) * 2018-03-26 2019-10-03 Thyssenkrupp Steel Europe Ag Cold-rolled flat steel product, use and method for producing such a flat steel product
CN111893396A (en) * 2020-08-20 2020-11-06 山东华星新材料科技有限公司 High-strength medium manganese steel and preparation method thereof
CN111945054A (en) * 2020-08-20 2020-11-17 山东华星新材料科技有限公司 High-aluminum medium-manganese steel and smelting method thereof
CN111996465A (en) * 2020-08-10 2020-11-27 北京科技大学 Light medium manganese steel hot rolled plate for ultrahigh-strength automobile and preparation method thereof
CN113073261A (en) * 2021-03-22 2021-07-06 鞍钢股份有限公司 Mn-TRIP steel plate with 50 GPa% strength-elongation product for automobile and preparation method thereof
CN114480988A (en) * 2021-12-27 2022-05-13 北京科技大学 Multiphase composite high-strength high-toughness low-density steel and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101638749A (en) * 2009-08-12 2010-02-03 钢铁研究总院 Automobile steel with low cost and high strength ductility balance and preparation method thereof
CN102304664A (en) * 2011-09-13 2012-01-04 北京科技大学 High strength and high plasticity aluminum-containing medium manganese transformation-induced plasticity (TRIP) cold-rolled steel plate and preparation method thereof
CN102925790A (en) * 2012-10-31 2013-02-13 钢铁研究总院 Method for producing high-strength and elongation product automobile steel plate by continuous annealing technology
CN103695765A (en) * 2013-12-11 2014-04-02 蔡志辉 Cold-rolled medium manganese steel with high strength and high plasticity and preparation method thereof
CN104328360A (en) * 2014-11-20 2015-02-04 北京科技大学 Double-phase twinborn induced plastic super-strength automobile steel plate and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101638749A (en) * 2009-08-12 2010-02-03 钢铁研究总院 Automobile steel with low cost and high strength ductility balance and preparation method thereof
CN102304664A (en) * 2011-09-13 2012-01-04 北京科技大学 High strength and high plasticity aluminum-containing medium manganese transformation-induced plasticity (TRIP) cold-rolled steel plate and preparation method thereof
CN102925790A (en) * 2012-10-31 2013-02-13 钢铁研究总院 Method for producing high-strength and elongation product automobile steel plate by continuous annealing technology
CN103695765A (en) * 2013-12-11 2014-04-02 蔡志辉 Cold-rolled medium manganese steel with high strength and high plasticity and preparation method thereof
CN104328360A (en) * 2014-11-20 2015-02-04 北京科技大学 Double-phase twinborn induced plastic super-strength automobile steel plate and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
S. J. PARK ET AL.: "Microstructure and tensile behavior of duplex low-density steel containing 5 mass% aluminum", 《SCRIPTA MATERIALIA》 *

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CN106756571A (en) * 2016-11-18 2017-05-31 扶绥县科学技术情报研究所 The High-strength steel material producing method of ultra-fine grain
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Application publication date: 20150610