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1. (WO2017169939) THIN STEEL SHEET AND PLATED STEEL SHEET, METHOD FOR PRODUCING HOT-ROLLED STEEL SHEET, METHOD FOR PRODUCING COLD-ROLLED FULL HARD STEEL SHEET, METHOD FOR PRODUCING HEAT-TREATED SHEET, METHOD FOR PRODUCING THIN STEEL SHEET AND METHOD FOR PRODUCING PLATED STEEL SHEET

Pub. No.:    WO/2017/169939    International Application No.:    PCT/JP2017/011076
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Wed Mar 22 00:59:59 CET 2017
IPC: C22C 38/00
C21D 9/46
C22C 38/38
C22C 38/58
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
Inventors: TAKASHIMA Katsutoshi
▲高▼島 克利
FUNAKAWA Yoshimasa
船川 義正
Title: THIN STEEL SHEET AND PLATED STEEL SHEET, METHOD FOR PRODUCING HOT-ROLLED STEEL SHEET, METHOD FOR PRODUCING COLD-ROLLED FULL HARD STEEL SHEET, METHOD FOR PRODUCING HEAT-TREATED SHEET, METHOD FOR PRODUCING THIN STEEL SHEET AND METHOD FOR PRODUCING PLATED STEEL SHEET
Abstract:
Provided is a plated steel sheet combining yield point ratio, strength (tensile strength), elongation, hole expansion and CTS. Also provided is a method for producing same. The thin steel sheet has a specific component composition, and a metal microstructure which, by volume percentage, contains 70-90% ferrite, 5-20% martensite, no more than 5% residual austenite, no more than 10% bainite, and no more than 5% pearlite, with the average crystal grain size of the ferrite not exceeding 20 µm, the average crystal grain size of the martensite not exceeding 5 µm, the average crystal grain size of the residual austenite not exceeding 5 µm, and the average crystal grain size of the bainite not exceeding 7 µm. The tensile strength of the thin steel sheet is at least 590 MPa.