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Cold-rolling medium Mn steel with low Mn content and high product of strength and ductility, and preparation method for same

A technology of high-strength plastic accumulation and manganese steel accumulation, which is applied in the field of automobile steel

Active Publication Date: 2019-11-05
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current patents on medium manganese steel, everyone is generally concerned about how to obtain higher strength and plasticity by adjusting the alloy composition or heat treatment process. No one has investigated the effect of Mn content on the toughness of ferrite in medium manganese steel.

Method used

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  • Cold-rolling medium Mn steel with low Mn content and high product of strength and ductility, and preparation method for same
  • Cold-rolling medium Mn steel with low Mn content and high product of strength and ductility, and preparation method for same

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preparation example Construction

[0034] The second aspect of the present invention provides a method for preparing the above-mentioned cold-rolled high-strength plastic-laminated medium-manganese steel with a lower Mn content, the steps comprising:

[0035] S1. Continuous casting of molten steel to produce slabs or mold castings to produce ingots. The chemical composition of molten steel includes: by weight percentage, C: 0.15-0.6%, Mn: 3.0-6.0%, Al: 1.0-3.0%, Si : 0-2.0%, Cr: 0-5.0%, Ni: 0-2.0%, the balance is Fe and unavoidable impurities;

[0036]S2. Hot rolling the billet or ingot obtained in step S1 after opening the billet. The hot rolling process includes: heating the billet to 1150-1250°C, soaking time for 1.5-2.5h, and hot rolling to a thickness through multiple passes It is a thin plate of 2-6mm, the final rolling temperature of the multi-pass hot rolling is not lower than 820°C, and the coiling is air-cooled to room temperature after rolling;

[0037] S3. Put the hot-rolled sheet or coiled sheet o...

Embodiment 1

[0042] This embodiment provides a cold-rolled high-strength ductile medium-manganese steel with a relatively low Mn content. The chemical composition is, by weight percentage, C: 0.45%, Mn: 5.0%, Al: 2.0%, Si: 0.3% , Cr: 0.7%, Ni: 0.4%, and the balance is Fe and unavoidable impurities.

[0043] The preparation method of the above-mentioned cold-rolled high-strength plastic product medium-manganese steel with lower Mn content, the steps include:

[0044] The steel billet is heated to 1200°C, soaking time is about 2 hours, hot rolled to a steel plate with a thickness of 4mm through multiple passes, the final rolling temperature is 820°C, and then coiled and air-cooled to room temperature.

[0045] The hot-rolled steel coils were put into a bell furnace for softening annealing, kept at 700°C for 20h, and then cooled to room temperature.

[0046] After pickling the hot-rolled annealed sheet, it is cold-rolled, and the cold-rolling reduction is 70%.

[0047] Put the cold-rolled s...

Embodiment 2

[0052] This embodiment provides a cold-rolled high-strength plastic-laminated medium-manganese steel with a relatively low Mn content. The chemical composition is, by weight percentage, C: 0.21%, Mn: 3.0%, Al: 1.2%, and Si: 1.5%. , Cr: 2.0%, Ni: 0.8%, V: 0.5%, B: 0.5%, and the balance is Fe and unavoidable impurities.

[0053] The preparation method of the above-mentioned cold-rolled high-strength plastic product medium-manganese steel with lower Mn content, the steps include:

[0054] The steel billet is heated to 1200°C, soaking time is about 2 hours, hot rolled to a steel plate with a thickness of 5mm through multiple passes, the final rolling temperature is 825°C, then coiled and air-cooled to room temperature.

[0055] The hot-rolled steel coils were put into a bell furnace for softening annealing, kept at 670°C for 24h, and then cooled to room temperature.

[0056] After pickling the hot-rolled annealed sheet, it is cold-rolled, and the cold-rolling reduction is 50%.

...

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Abstract

The invention provides cold-rolling medium Mn steel with a low Mn content and a high product of strength and ductility, and a preparation method for the same. The steel contains, by weight, the chemical components including 0.15%-0.6% of C, 3.0%-6.0% of Mn, 1.0%-3.0% of Al, 0.0%-2.0% of Si, 0%-5.0% of Cr, 0%-2.0% of Ni and the balance being Fe and inevitable impurities. Preparation of the cold-rolling medium Mn steel with the high product of strength and ductility comprises the steps that molten steel is smelted by a converter, and a continuous casting blank is obtained through continuous casting; the continuous casting black is heated by a heating furnace, and a hot-rolling plate roll is obtained after hot rolling; the hot-rolling roll is treated with softening annealing by a bell furnace, and cold and hard belt steel is obtained after cold rolling; and the cold and hard belt steel is treated with continuous annealing, and the finished product of the cold-rolling medium Mn steel withthe high product of strength and ductility is obtained. The cold-rolling medium Mn steel and the preparation method provided by the invention have the beneficial effects that the Mn steel has the highproduct of strength and ductility on the premise that good ductility is ensured during cold rolling; and the significance of practical application is high.

Description

technical field [0001] The invention belongs to the technical field of steel for automobiles, and in particular relates to a cold-rolled high-strength plastic-laminated medium-manganese steel with relatively low Mn content and a preparation method thereof. Background technique [0002] With the increasing requirements of the automobile industry for energy saving, emission reduction and collision safety, the medium manganese steel for automobiles with high strength and plasticity has increasingly become the focus of attention. Under the condition of quasi-static tension, the strength-plastic product of cold-rolled medium-manganese steel can reach up to about 80GPa·%. After annealing in the critical zone, the medium manganese steel is mainly composed of fine ferrite and metastable austenite, in which the ferrite has a very low C content, and its chemical composition is similar to that of Fe-Mn alloy. Fe-Mn alloys tend to be brittle, and the higher the concentration of Mn at t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/38C22C38/34C22C38/18C22C38/08C22C38/06C22C38/04C22C38/02C21D8/02
CPCC21D8/0205C21D8/0247C21D2211/001C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/18C22C38/34C22C38/38C22C38/58
Inventor 阳锋韩赟姜英花刘华赛谢春乾邱木生潘丽梅白雪滕华湘陈斌曹杰章军朱国森
Owner SHOUGANG CORPORATION
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