Invention Grant
US08168014B2 Method for manufacturing martensitic stainless steel pipe or tube 有权
制造马氏体不锈钢管或管的方法

  • Patent Title: Method for manufacturing martensitic stainless steel pipe or tube
  • Patent Title (中): 制造马氏体不锈钢管或管的方法
  • Application No.: US12593677
    Application Date: 2008-03-26
  • Publication No.: US08168014B2
    Publication Date: 2012-05-01
  • Inventor: Nobuyuki Mori
  • Applicant: Nobuyuki Mori
  • Applicant Address: JP Osaka
  • Assignee: Sumitomo Metal Industries, Ltd.
  • Current Assignee: Sumitomo Metal Industries, Ltd.
  • Current Assignee Address: JP Osaka
  • Agency: Clark & Brody
  • Priority: JP2007-092397 20070330
  • International Application: PCT/JP2008/055644 WO 20080326
  • International Announcement: WO2008/123275 WO 20081016
  • Main IPC: C21D9/08
  • IPC: C21D9/08
Method for manufacturing martensitic stainless steel pipe or tube
Abstract:
The method for manufacturing a martensitic stainless pipe includes heating the steel pipe until the external surface temperature thereof reaches a predetermined temperature not lower than A3 transformation point+20° C. and not higher than 980° C. The heated steel pipe is first water cooled until the external surface temperature thereof reaches a predetermined temperature not lower than 350° C. The water cooled steel pipe is air cooled until the external surface temperature thereof reaches a predetermined temperature not higher than 250° C. The air cooled steel pipe is either water or air cooled until the external surface temperature thereof reaches normal temperature. The cooling rate of the steel pipe in the first cooling step is determined according to the wall thickness of the steel pipe so that the amount of heat recuperation for the external surface temperature of the steel pipe in the second cooling step is not higher than 50° C.
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