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1. (WO2018143318) MOLTEN ZINC PLATING STEEL SHEET AND PRODUCTION METHOD THEREFOR

Pub. No.:    WO/2018/143318    International Application No.:    PCT/JP2018/003328
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Fri Feb 02 00:59:59 CET 2018
IPC: C22C 38/00
C21D 9/46
C22C 38/14
C22C 38/60
C23C 2/06
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
MORIYASU Noriaki
森安 永明
NABESHIMA Shigeyuki
鍋島 茂之
TAHARA Kazunori
田原 和憲
SASAKI Kana
佐々木 香菜
Title: MOLTEN ZINC PLATING STEEL SHEET AND PRODUCTION METHOD THEREFOR
Abstract:
Provided is a molten zinc plating steel sheet having more excellent punchability. This molten zinc plating steel sheet has a compositional makeup containing, in mass%, 0.08-0.20% of C, 0.5% or less of Si, 0.8-1.8% of Mn, 0.10% or less of P, 0.030% or less of S, 0.10% or less of Al, and 0.010% or less of N, and further, one or more of 0.01-0.3% of Ti, 0.01-0.1% of Nb, and 0.01-1.0% of V so as to satisfy (Ti/48 + Nb/93 + V/51) × 12 ≥ 0.07, the remaining portion being Fe and incidental impurities, and has a structure in which: the total area proportion of a ferrite phase and a tempered veinite phase is 95% or more; the average particle size is 5.0 μm or less; and further, the amount of deposited Fe is 0.10 mass% or more; the amount of Ti, Nb, and V deposited as deposits having a particle size of less than 20 nm is 0.025 mass% or more in terms of deposited C; and at least half of the deposits having a particle size of less than 20 nm is randomly deposited.