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1. (WO2018011978) HOT-DIP GALVANIZED STEEL SHEET

Pub. No.:    WO/2018/011978    International Application No.:    PCT/JP2016/070982
Publication Date: Fri Jan 19 00:59:59 CET 2018 International Filing Date: Sat Jul 16 01:59:59 CEST 2016
IPC: C22C 38/00
C21D 9/46
C22C 38/58
C23C 2/06
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: YOKOYAMA, Takafumi
横山 卓史
HAYASHI, Kunio
林 邦夫
AZUMA, Masafumi
東 昌史
SAKURADA, Eisaku
桜田 栄作
KAWATA, Hiroyuki
川田 裕之
ABUKAWA, Genki
虻川 玄紀
Title: HOT-DIP GALVANIZED STEEL SHEET
Abstract:
This hot-dip galvanized steel sheet has a specific chemical composition and a steel structure that is represented as: containing, in terms of area ratio, polygonal ferrite in an amount not more than 10%, upper bainite in an amount not more than 20%, residual austenite in an amount not more than 5%, and martensite in an amount not less than 70%; and a martensite that includes Fe carbides at a number density not less than 1×106/mm2, that is contained in an amount not less than 50% of the entire amount of martensite, and that has an average effective crystal grain size of not more than 5.0 μm.