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1. (WO2017033901) ALLOYING MOLTEN ZINC-PLATED STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Pub. No.:    WO/2017/033901    International Application No.:    PCT/JP2016/074424
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Tue Aug 23 01:59:59 CEST 2016
IPC: C22C 38/00
C21D 9/46
C22C 38/14
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: OKA, Masaharu
岡 正春
KOJIMA, Nobusato
小嶋 啓達
OKADA, Tetsuya
岡田 哲也
Title: ALLOYING MOLTEN ZINC-PLATED STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Abstract:
Provided is an alloying molten zinc-plated steel sheet with high strength and excellent deep drawability as well as excellent slab cracking resistance and secondary working embrittlement resistance. The base steel sheet for this alloying molten zinc-plated steel sheet contains, in mass%, C: 0.0080% or less, Si: 0.7% or less, Mn: 1.0-2.5%, P: greater than 0.030-0.048%, S: 0.025% or less, Al: 0.005-0.20%, N: 0.010% or less, Ti: 0.005-0.040%, Nb: 0.005-0.060%, and B: 0.0005-0.0030%, the balance being obtained from Fe and impurities, and has a chemical composition that satisfies expression (1) - expression (4). The alloying molten zinc-plating layer contains 7-15 mass% Fe. 25 × P + 4 × Si ≤ 3.6 (1) B−X1 ≥ 0.0005 (2) C−(12/93) × Nb − X2 ≥ −0.0035 (3) 110 × Si + 48 × Mn + 550 × P ≥ 120 (4)