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Hot-rolled medium manganese steel with high product of strength and elongation and relatively low Mn content and preparation method thereof

A technology of high-strength plastic accumulation and medium manganese steel, which is applied in the field of automotive steel to achieve the effect of reducing Mn content and reducing the risk of embrittlement

Active Publication Date: 2019-10-18
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 paid attention to the effect of Mn content on ferrite, one of the constituent phases of medium manganese steel. Adverse Effects on Resilience

Method used

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  • Hot-rolled medium manganese steel with high product of strength and elongation and relatively low Mn content and preparation method thereof
  • Hot-rolled medium manganese steel with high product of strength and elongation and relatively low Mn content and preparation method thereof

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preparation example Construction

[0032]The second aspect of the present invention provides a method for preparing the above-mentioned hot-rolled high-strength plastic medium-manganese steel with a lower Mn content, the steps comprising:

[0033] S1. Continuous casting of molten steel to produce slabs or die castings to produce ingots. The chemical composition of the molten steel includes: by weight percentage, C: 0.19-0.5%, Mn: 3.0-7.0%, Al: 1.0-3.0%, Si : 0-2.0%, Cr: 0-5.0%, Ni: 0-2.0%, the balance is Fe and unavoidable impurities;

[0034] S2. Hot rolling the billet or ingot obtained in step S1 after opening the billet. The hot rolling process includes: heating the billet to 1120-1200°C, soaking time for 1.5-2.5h, and hot rolling to a thickness through multiple passes 2-6mm thin plate, the final rolling temperature of the multi-pass hot rolling is 820-900°C, the coiling temperature after rolling is 500-600°C, and air-cooled to room temperature;

[0035] S3. Put the hot-rolled sheet or coiled sheet obtained...

Embodiment 1

[0038] This embodiment provides a hot-rolled high-strength plastic-laminated medium-manganese steel with a relatively low Mn content. The chemical composition is, by weight percentage, C: 0.45%, Mn: 6.0%, Al: 2.0%, and Si: 1.0%. , Cr: 0.7%, Ni: 0.4%, and the balance is Fe and unavoidable impurities.

[0039] The preparation method of the above-mentioned hot-rolled high-strength plastic product medium manganese steel with lower Mn content, the steps include:

[0040] The steel billet is heated to 1200°C, soaking time is about 2 hours, and hot rolled to a steel plate with a thickness of 4mm through multiple passes, the final rolling temperature is 820°C, and then coiled at 550°C and air-cooled to room temperature.

[0041] The hot-rolled steel coils were annealed in a bell-type heating furnace, kept at 700 °C for 1 h, and then cooled to room temperature.

[0042] A hot-rolled high-strength plastic-laden medium-manganese steel was obtained, and its structure scanning electron mi...

Embodiment 2

[0047] This embodiment provides a hot-rolled high-strength plastic-laminated medium-manganese steel with a relatively low Mn content. The chemical composition is, by weight percentage, C: 0.38%, Mn: 3.0%, Al: 2.1%, and Si: 0.8% , Cr: 3.1%, Ni: 1.8%, V: 0.2%, B: 0.2%, and the balance is Fe and unavoidable impurities.

[0048] The preparation method of the above-mentioned hot-rolled high-strength plastic product medium manganese steel with lower Mn content, the steps include:

[0049] The steel billet is heated to 1180°C, soaking time is about 2 hours, and hot-rolled to a steel plate with a thickness of 5mm through multiple passes, the final rolling temperature is 850°C, and then coiled at 525°C and air-cooled to room temperature.

[0050] The hot-rolled steel coil was put into a bell-type heating furnace for annealing, kept at 670° C. for 3 hours, and then cooled to room temperature to obtain a hot-rolled high-strength plastic-laminated medium-manganese steel whose mechanical p...

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Abstract

The invention provides hot-rolled medium manganese steel with high product of strength and elongation and relatively low Mn content and a preparation method thereof. The hot-rolled medium manganese steel comprises the following chemical components of, in percentage by weight, 0.19-0.5% of C, 3.0-7.0% of Mn, 1.0-3.0% of Al, 0-2.0% of Si, 0-5.0% of Cr, 0-2.0% of Ni and balance Fe and inevitable impurities. The preparation method of the hot-rolled medium manganese steel with high product of strength and elongation comprises the following steps of carrying out smelting on molten steel in a converter and obtaining a continuous casting billet by adopting a continuous casting mode; heating the continuous casting billet through a heating furnace and then obtaining a hot rolled coil after being subjected to hot rolling; and carrying out annealing on the hot rolled coil in a bell-type furnace and obtaining finished product of the hot-rolled medium manganese steel with high product of strength and elongation. According to the hot-rolled medium manganese steel with high product of strength and elongation and relatively low Mn content and the preparation method thereof, the hot-rolled medium manganese steel has higher product of strength and elongation at the same time under the premise that the good toughness is ensured, and has good practical application significance.

Description

technical field [0001] The invention belongs to the technical field of steel for automobiles, and in particular relates to a hot-rolled high-strength plastic-laden 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. At present, under quasi-static tensile conditions, the strength-plastic product of hot-rolled medium-manganese steel can reach up to about 60GPa·%. After annealing in the two-phase region, 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. It is well known that Fe-Mn alloys tend to be brittle, and the higher the ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/02C22C38/08C22C38/38C22C38/34C22C38/58C22C38/12C22C38/14C22C38/16C22C38/10C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C22C38/32C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C21D8/02
CPCC21D8/0226C21D8/0263C21D2211/001C21D2211/005C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/10C22C38/105C22C38/12C22C38/14C22C38/16C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C22C38/32C22C38/34C22C38/38C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C22C38/58
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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