Research and Development > Technical Report > No.10 Special Issue on High Strength Steel Sheets > Hot Rolled High Strength Steels for Suspension and Chassis Parts “NANOHITEN” and “BHT® Steel”

No.10 Special Issue on High Strength Steel Sheets

Hot Rolled High Strength Steels for Suspension and Chassis Parts “NANOHITEN” and “BHT^® Steel”

SETO Kazuhiro     FUNAKAWA Yoshimasa     KANEKO Shinjiro

Abstract

Since hot rolled steel sheets for automobile suspension and chassis parts are frequently formed by burring, materials for these applications must possess hole expansionability as well as high strength. “NANOHITEN” is a type of precipitation hardened steel with a soft ferrite single phase matrix and ultra-fine carbides of single nanometer size which successfully satisfies both strength and hole expansionability requirements. “BHT^® steel” achieves a very large increase in tensile strength in baking treatment utilizing the strain aging effect of N, which has a high solubility limit. As a result, strength after forming is on virtually the same level as when conventional materials with higher strength levels are used.

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