La microalloy-added hot-press formed steel plate and preparation method thereof

Abstract

The invention belongs to the technical field of steel preparation, and relates to a La microalloy-added hot-press formed steel plate and a preparation method thereof. The La microalloy-added hot-pressformed steel plate is composed of the following chemical components of, in percentage by mass, 0.23% - 0.35% of C, 1.2% - 2.0% of Mn, less than 1.0% of Si, 0.05% - 0.5% of Al, less than 0.3% of Cr, less than 0.5% of Mo, less than 0.1% of Nb, less than 0.15% of V, less than 0.1% of Ti, greater than or equal to 0.0005% of B, 0.01% - 0.05% of P, less than 0.004% of O, less than 0.005% of S, 0% - 0.0005% of H, less than 0.01% of Ca, 0.0025% - 0.01% of La microalloy occurrence amount, and the balance Fe and inevitable impurities. According to the hot-press formed steel, the La element is added ina microalloy form, the La microalloy has the effect of delaying ferrite phase change, the stamping temperature can be reduced, the austenite stability can be improved, the material welding performancecannot be damaged, and the cost is low; and according to the hot-press forming process, qualified parts are stamped on existing equipment through hot-press formed steel with the specification of 1.2mm or below, and meanwhile the problem that the application qualification rate of full-size specification products is low under the condition that the environment temperature is low in winter in the north is solved.

Description

technical field [0001] The invention belongs to the technical field of steel preparation, and in particular relates to a hot-pressed steel plate added with La microalloy and a preparation method thereof. Background technique [0002] As the society continues to pay attention to energy saving and emission reduction, automobile lightweight design is one of the core technologies to realize energy saving and emission reduction in the automobile industry. Higher strength materials are used to replace low strength materials. , to achieve weight reduction of parts, has become a hot topic in the research of steel materials for automobiles. The hot press forming technology is to form the hot press forming steel after heating and quenching in the mold. It has the characteristics of high strength and high dimensional accuracy of the parts. It can prepare parts with arbitrary complex shapes and has been widely used. The amount of thermoforming of some European models has accounted for ...

AI Technical Summary

Problems solved by technology

Realize the stamping out of qualified parts of 1.2mm and below hot-pressed formed steel on existing equipment, and at the same time solve the problem of low pass rate for full-size products in the winter when the ambient temperature is low in the north

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