- 专利标题: Method of production of hot dip galvannealed steel sheet with excellent workability, powderability, and slidability
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申请号: US12225170申请日: 2007-03-28
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公开(公告)号: US10023931B2公开(公告)日: 2018-07-17
- 发明人: Junji Haji , Kaoru Kawasaki , Kiyokazu Ishizuka , Teruaki Yamada
- 申请人: Junji Haji , Kaoru Kawasaki , Kiyokazu Ishizuka , Teruaki Yamada
- 申请人地址: JP Tokyo
- 专利权人: NIPPON STEEL & SUMITOMO METAL CORPORATION
- 当前专利权人: NIPPON STEEL & SUMITOMO METAL CORPORATION
- 当前专利权人地址: JP Tokyo
- 代理机构: Birch, Stewart, Kolasch & Birch, LLP
- 优先权: JP2006-106528 20060407
- 国际申请: PCT/JP2007/057499 WO 20070328
- 国际公布: WO2007/119665 WO 20071025
- 主分类号: C23C2/02
- IPC分类号: C23C2/02 ; C21D9/46 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C23C2/04 ; C23C2/06 ; C23C2/26 ; C23C2/28
摘要:
The present invention provides a method of production of hot dip galvannealed steel sheet with excellent workability compared with the Sendzimir method or non-oxidizing furnace method and further with excellent powdering or slidability, that is, a method of production of hot dip galvannealed steel sheet with excellent workability, powdering, and slidability characterized by processing a slab containing, by mass %, C: 0.01 to 0.12%, Mn: 0.05 to 0.6%, Si: 0.002 to 0.1%, P: 0.05% or less, S: 0.03% or less, sol. Al: 0.005 to 0.1%, and N: 0.01% or less and having a balance of Fe and unavoidable impurities by hot rolling, pickling, cold rolling, then annealing at 650 to 900° C., cooling to 250 to 450° C., holding at said temperature range for 120 seconds or more, then cooling to room temperature, pickling, preplating Ni or Ni—Fe without intermediate temper rolling, heating by 5° C./sec or more down to 430 to 500° C., galvanizing in a galvanization bath, wiping, then heating by a rate of temperature rise of 20° C./sec or more up to 460 to 550° C., not providing any soaking time or holding for soaking for less than 5 seconds, then cooling by 3° C./sec or more, and final temper rolling by a 0.4 to 2% elongation rate.