Title:
合金化溶融亜鉛めっき鋼板及びその製造方法
Document Type and Number:
Japanese Patent JP6402830
Kind Code:
B2
Abstract:
Provided is a galvannealed steel sheet having high strength and excellent deep drawability, and being further excellent in slab cracking resistance and secondary working embrittlement resistance. A base metal steel sheet of the galvannealed steel sheet according to the present invention has a chemical composition containing, in mass %: C: 0.0080% or less; Si: 0.7% or less; Mn: 1.0 to 2.5%; P: more than 0.030 to 0.048%; S: 0.025% or less; Al: 0.005 to 0.20%; N: 0.010% or less; Ti: 0.005 to 0.040%; Nb: 0.005 to 0.060%; and B: 0.0005 to 0.0030%, with the balance being Fe and impurities, the chemical composition satisfying Formula (1) to Formula (4). A galvannealed layer contains 7 to 15 mass% of Fe. 25 × P + 4 × Si ¤ 3.6 B X 1 ¥ 0.0005 C 12 / 93 × Nb X 2 ¥ 0.0035 110 × Si + 48 × Mn + 550 × P ¥ 120
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Inventors:
Masaharu Oka
Keitatsu Kojima
Tetsuya Okada
Keitatsu Kojima
Tetsuya Okada
Application Number:
JP2017536427A
Publication Date:
October 10, 2018
Filing Date:
August 22, 2016
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
C22C38/00; C21D9/46; C22C38/14
Domestic Patent References:
| JP63047338A | ||||
| JP2015063729A | ||||
| JP2007321169A |
Foreign References:
| WO2013099712A1 |
Attorney, Agent or Firm:
Ascend Patent Business Corporation