发明授权
- 专利标题： Method for producing a seamless steel tubular product
- 专利标题（中）： 无缝钢管制品的制造方法
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申请号： US633169申请日： 1996-04-16
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公开(公告)号： US5816087A公开(公告)日： 1998-10-06
- 发明人: Tatsuro Katsumura , Yusuke Minami , Masahiko Yasukawa
- 申请人： Tatsuro Katsumura , Yusuke Minami , Masahiko Yasukawa
- 申请人地址： JPX Tokyo
- 专利权人： NKK Corporation
- 当前专利权人： NKK Corporation
- 当前专利权人地址： JPX Tokyo
- 主分类号： B21B3/02
- IPC分类号： B21B3/02 ; B21B15/00 ; B21B17/08 ; B21B19/04 ; B21B25/04 ; B21B45/00 ; B21B45/02 ; B21D30/02
摘要：
A seamless steel tubular product is produced by hot-piercing an alloy-steel billet with a piercing plug to produce a hollow shell and then rolling the hollow shell. Prior to the hot-piercing, a steel sheet is joined to an end surface of the billet into which the plug is to be driven, such that the steel plate may not project beyond the periphery of the billet, the steel plate having a surface area (C) satisfying the equation: S.times.0.2.ltoreq.C.ltoreq.S.times.1.2 where, S is represented (plug bottom radius).sup.2 .times.3.14.
公开/授权文献
- US5498532A Process for producing amino acids 公开/授权日：1996-03-12