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1. (WO2017154727) HIGH-STRENGTH THIN STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Pub. No.:    WO/2017/154727    International Application No.:    PCT/JP2017/008291
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: C22C 38/00
C21D 9/46
C22C 38/06
C22C 38/60
C23C 2/06
C23C 2/26
C23C 2/28
C23C 2/40
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
Inventors: KIZU Taro
木津 太郎
Title: HIGH-STRENGTH THIN STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Abstract:
Provided are a high-strength thin steel sheet having high yield ratio and excellent formability, and a method for manufacturing the same. The present invention contains 0.04-0.25% C, 0.5-2.0% Si, 0.1-2.0% Mn, 0.05% or less of P, 0.030% or less of S, 0.10% or less of Al, and 0.010% or less of N, the remainder comprising iron and unavoidable impurities, the combined total of ferrite and bainite in the metallographic structure in the present invention is at least 90% in terms of area ratio, and the aspect ratio of the ferrite and bainite is 3.0 or greater.