基本信息:
- 专利标题： 高强度合金化热镀锌钢板的制造方法
- 申请号：CN201480067807.5 申请日：2014-12-11
- 公开(公告)号：CN105814229B 公开(公告)日：2018-05-18
- 发明人： 牧水洋一 , 铃木善继 , 青山麻衣 , 长谷川宽 , 武田玄太郎
- 申请人： 杰富意钢铁株式会社
- 申请人地址： 日本东京
- 专利权人： 杰富意钢铁株式会社
- 当前专利权人： 杰富意钢铁株式会社
- 当前专利权人地址： 日本东京
- 代理机构： 中原信达知识产权代理有限责任公司
- 代理人： 满凤; 金龙河
- 优先权： 2013-257569 2013.12.13 JP
- 国际申请： PCT/JP2014/006177 2014.12.11
- 国际公布： WO2015/087549 JA 2015.06.18
- 进入国家日期： 2016-06-13
- 主分类号： C23C2/28
- IPC分类号： C23C2/28 ; C21D9/46 ; C22C18/04 ; C22C38/00 ; C22C38/04 ; C22C38/58 ; C23C2/02 ; C23C2/06 ; C23C2/40
The invention provides a method for producing high-strength galvannealed steel sheets having excellent workability and fatigue resistance. A steel sheet containing 0.1 to 2.5% Si is subjected to an oxidation treatment, then to reducing annealing, thereafter to a hot-dip galvanizing treatment and to an alloying treatment. In the oxidation treatment, the steel sheet is heated in an upstream stage at a temperature of 400 to 750°C in an atmosphere having an O 2 concentration of not less than 1000 ppm by volume and a H 2 O concentration of not less than 1000 ppm by volume, and is heated in a downstream stage at a temperature of 600 to 850°C in an atmosphere having an O 2 concentration of less than 1000 ppm by volume and a H 2 O concentration of not less than 1000 ppm by volume. In the reducing annealing, the steel sheet is heated at a temperature of 650 to 900°C in an atmosphere containing 5 to 30 vol% of H 2 and 500 to 5000 ppm by volume of H 2 O the balance being N 2 and inevitable impurities. In the alloying treatment, the steel sheet is treated at a temperature T (°C) satisfying the following relation for 10 to 60 seconds: ˆ’ 50 log H 2 O + 650 ‰¤ T ‰¤ ˆ’ 40 log H 2 O + 680 ( H 2 O represents the H 2 O concentration (ppm by volume) during the reducing annealing).
公开/授权文献:
- CN105814229A 高强度合金化热镀锌钢板的制造方法 公开/授权日：2016-07-27