Hot stamp molded body, and method for producing same

Abstract

A hot stamp molded body has a chemical composition containing 0.0005-0.0080 mass% of C; 0.005-1.000 mass% of Si; 0.01-2.50 mass% of Mn; 0.010-0.100 mass% of Al; at most 0.200 mass% of P; at most 0.100 mass% of S; at most 0.0100 mass% of N; and the balance that is Fe and impurities. In addition, the hot stamp molded body has a metallic structure comprising, in an area fraction: 20-95% (exclusive of 95) of an acicular ferrite; 5-80% of a polygonal ferrite; and 0-5% of a remaining structure.

Description

technical field [0001] The present invention relates to a hot stamping formed body and a manufacturing method thereof. More specifically, the present invention relates to a hot-stamped body excellent in strength and ductility, which contributes to weight reduction of a vehicle body and improvement in collision safety, and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. 2019-096625 filed in Japan on May 23, 2019, and the contents thereof are applied here. Background technique [0003] In recent years, high-strength steel sheets have been applied to body parts of vehicles in response to demands for lightweight vehicles and improved crash safety. Since vehicle body parts are formed by press molding, improvement of press formability, especially improvement of shape freezing properties is a problem. Therefore, the hot stamping method is attracting attention as a method of manufacturing high-strength vehicle bod...

AI Technical Summary

Problems solved by technology

[0007] In the case of using ultra-low carbon steel as a low-strength material, there are cases where fracture occurs and the energy absorption capacity of the part is significantly reduced when subjected to large tensile deformation instead of bending mode due to the concentration of deformation due to collision

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