Cold-rolled medium manganese steel with high strength and high plasticity and preparation method thereof

A high-plasticity, high-strength technology, applied in the field of high-strength and high-plasticity cold-rolled steel, can solve the problems of unsuitability for cold-rolled TRIP steel, unfavorable industrial production, inconvenient operation, etc. The effect of rolling cracking

Inactive Publication Date: 2014-04-02
蔡志辉
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Problems solved by technology

These two heat treatment processes are inconvenient to operate, consume a lot of energy, are unfavorable f

Method used

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  • Cold-rolled medium manganese steel with high strength and high plasticity and preparation method thereof

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Experimental program
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Embodiment

[0017] The medium manganese steel is smelted into a steel ingot, the composition of which is C=0.18%, Mn=10.62%, A1=4.06%, Nb=0.025% by weight percentage, and the balance is Fe and impurities. The steel ingot is heated to 1200°C, Keep warm for 2 hours, and forge into a steel billet with a cross-sectional area of ​​100mm×30mm.

[0018] Put the billet into a high-temperature furnace and heat it from room temperature to 1250°C, hold it for 2 hours, and then hot-roll it into a thin plate with a thickness of 4mm after 6-8 passes. The initial rolling temperature is 1150°C, and the final rolling temperature is not lower than 850°C. room temperature.

[0019] Heat treatment after rolling: keep the hot-rolled sheet in a heating furnace at 775°C for 1 hour, and quickly water-cool it to room temperature; temper the quenched steel sheet at 200°C for 20 minutes, then air-cool it to room temperature.

[0020] Pickling: Use 1:3 hydrochloric acid and water to pickle the heat-treated steel pl...

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Abstract

The invention discloses cold-rolled medium manganese TRIP (Transformation Induced Plasticity) steel of which the tensile strength is over 1000MPa, the total ductility is over 60%, and the product of strength and elongation is about over 60GPa%, and a preparation method thereof, and belongs to the technical field of cold-rolled steel with high strength and high ductility. The cold-rolled medium manganese TRIP steel comprises the following chemical ingredients by weight percent: 0.15-0.20% of C, 8.0-11.0% of Mn, 3.0-40% of Al, 0-0.040% of Nb, and the balance of Fe and impurities. The preparation method of the cold rolled TRIP steel comprises smelting, forging, hot rolling, thermal treatment after rolling, pickling, cold rolling and thermal treatment after rolling. The cold-rolled TRIP steel is high in strength, good in plasticity, and simple in thermal treatment technology after rolling, and is a new generation of ideal automotive steel.

Description

technical field [0001] The invention belongs to the technical field of high-strength and high-plasticity cold-rolled steel, and in particular relates to a high-strength and high-plasticity cold-rolled medium manganese steel and a preparation method thereof. Background technique [0002] Due to the continuous improvement of energy-saving, environmental protection and safety requirements in the automotive industry, many institutions are committed to developing a new generation of lightweight high-strength automotive steel. The strength-plastic product is an important index to measure the performance of automobile steel. The strength and plasticity of the first generation of automotive steel is low, generally ≤ 25GPa%; the second generation of automotive steel is too high in cost due to excessive alloy content, and the process performance is poor; it is precisely because of these unfavorable conditions that the The use of these two generations of automotive steel has hidden da...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C33/04C21D8/02
Inventor 蔡志辉丁桦英钲艳辛啟斌
Owner 蔡志辉
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