发明授权
US4373971A Process for the production of ferritic stainless steel sheets or strips
and products produced by said process
失效
用于生产铁素体不锈钢板或带材的方法和由所述方法生产的产品
- 专利标题: Process for the production of ferritic stainless steel sheets or strips and products produced by said process
- 专利标题(中): 用于生产铁素体不锈钢板或带材的方法和由所述方法生产的产品
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申请号: US222762申请日: 1981-01-06
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公开(公告)号: US4373971A公开(公告)日: 1983-02-15
- 发明人: Tadashi Sawatani , Mitsuo Ishii , Hirofumi Yoshimura
- 申请人: Tadashi Sawatani , Mitsuo Ishii , Hirofumi Yoshimura
- 申请人地址: JPX Tokyo
- 专利权人: Nippon Steel Corporation
- 当前专利权人: Nippon Steel Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX55-1883 19800111
- 主分类号: C21D9/46
- IPC分类号: C21D9/46 ; C21D6/00 ; C21D8/02 ; C22C38/18
摘要:
In a process for the production of cold rolled ferritic stainless steel sheets or strips, a hot rolled strips has been annealed by a long time batchwise annealing and cold rolling and recrystallization annealing have been repeated usually twice. In the present invention, a hot rolled steel strip of an Al-containing ferritic stainless steel is heated by continuous annealing to a temperature of from 850.degree. to 1100.degree. C., AlN (aluminum nitride) is precipitated in the dispersed state and then cooling the strip to a temperature of 700.degree. to 900.degree. C., performing subsequent cooling to a level not higher than 200.degree. C. at such a cooling rate that a chromium depletion layer, which causes a gold dust defect, is not formed around the chromium carbonitride. Single cold rolling and recrystallization annealing are carried out in combination until the thickness is reduced to the gauge thickness.
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