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 PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910000617 Mangalloy Inorganic materials 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 7
- 239000011572 manganese Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000009825 accumulation Methods 0.000 claims abstract description 3
- 238000000137 annealing Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims abstract 2
- 238000005097 cold rolling Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 9
- 238000005275 alloying Methods 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000000265 homogenisation Methods 0.000 claims description 3
- 241001062472 Stokellia anisodon Species 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims description 2
- 230000001186 cumulative Effects 0.000 claims 1
- 238000002791 soaking Methods 0.000 claims 1
- 229910001566 austenite Inorganic materials 0.000 abstract description 11
- 229910000529 magnetic ferrite Inorganic materials 0.000 abstract description 5
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 5
- 238000002844 melting Methods 0.000 abstract description 2
- 239000007769 metal material Substances 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract 1
- 238000005242 forging Methods 0.000 abstract 1
- 238000010791 quenching Methods 0.000 abstract 1
- 230000000171 quenching Effects 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 239000000758 substrate Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 210000001519 tissues Anatomy 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910000937 TWIP steel Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 206010068052 Mosaicism Diseases 0.000 description 1
- 210000003765 Sex Chromosomes Anatomy 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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
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 |
| Ⅰ | 0.18 | 6.1 | 5.2 | ＜0.003 | ＜0.002 | Bal. |
| Ⅱ | 0.18 | 7.9 | 5.0 | ＜0.003 | ＜0.002 | Bal. |
| Ⅲ | 0.22 | 8.3 | 6.9 | ＜0.003 | ＜0.002 | Bal. |
| Ⅳ | 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%).
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| 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 |
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| 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 |
| CN111996465B (en) * | 2020-08-10 | 2021-11-05 | 北京科技大学 | Light medium manganese steel hot rolled plate for ultrahigh-strength automobile and preparation method thereof |
| 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 |
| CN111893396B (en) * | 2020-08-20 | 2021-11-09 | 山东华星新材料科技有限公司 | High-strength medium manganese steel 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 |
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Application publication date: 20150610 |