Fe-Mn-Al-C series cold-rolled automobile steel and preparation method

Abstract

The invention discloses a Fe-Mn-Al-C series cold-rolled automobile steel and a preparation method, and belongs to the field of material processing. The steel comprises the following chemical components of, by mass, 0.7-0.9% of C, 10.0-14.0% of Mn, 7-9% of Al, less than 0.005% of P, less than 0.002% of S, and the balance Fe and inevitable impurities. The preparation method comprises the following steps that 1), according to the composition proportion of the Fe-Mn-Al-C series cold-rolled automobile steel, smelting and casting are carried out to obtain a ingot blank; 2), the ingot blank undergoesheating and heat preservation and then undergoes forging; 3), the ingot blank undergoes heating and heat preservation and then undergoes hot rolling, then the ingot blank undergoes water cooling to reach the room temperature, and a hot rolled plate is obtained; 4), the hot rolled plate undergoes heating and heat preservation, and then undergoes cold rolling, then the plate undergoes water coolingto reach the room temperature, and a cold rolled plate is obtained; and 5), the cold rolled plate undergoes heating and heat preservation, and then is cooled to reach the room temperature, and the Fe-Mn-Al-C series cold-rolled automobile steel is prepared. According to the steel prepared by the method, the tensile strength is 1014.9-1039.8 MPa, the yield strength is 789.6-839.2 MPa, the elongation rate is 42-43%, the strong plastic volume is 42.6-44.7 GPa.%.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a Fe-Mn-Al-C series cold-rolled automobile steel and a preparation method thereof. Background technique [0002] In recent years, with the continuous improvement of national living standards, car ownership has maintained a rapid growth. By the end of 2016, the number of cars in the country reached 194 million. The rapid development of the automobile industry has brought great convenience to people's lives, but it has also brought a series of energy and environmental problems. Energy saving and emission reduction has become an important issue that the automotive industry needs to solve urgently. Statistics show that every 1% reduction in vehicle weight can save about 0.7% in fuel consumption. Therefore, automobile lightweight has become the development trend of the automobile industry. [0003] At present, there are two main ways to realize the lightweight of aut...

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Problems solved by technology

However, experiments have found that a higher Mn content brings many difficulties such as difficult smelting, serious composition segregation, and high production costs, making it difficult to apply to large-scale industrial production.

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