发明申请
US20110236248A1 HIGH-PURITY FERRITIC STAINLESS STEEL WITH EXCELLENT CORROSION RESISTANCE AND WORKABILITY AND METHOD OF PRODUCTION OF SAME 有权
具有优异耐腐蚀性和可工作性的高纯度不锈钢及其生产方法

  • 专利标题: HIGH-PURITY FERRITIC STAINLESS STEEL WITH EXCELLENT CORROSION RESISTANCE AND WORKABILITY AND METHOD OF PRODUCTION OF SAME
  • 专利标题(中): 具有优异耐腐蚀性和可工作性的高纯度不锈钢及其生产方法
  • 申请号: US12735549
    申请日: 2009-01-13
  • 公开(公告)号: US20110236248A1
    公开(公告)日: 2011-09-29
  • 发明人: Masaharu HatanoAkihiko Takahashi
  • 申请人: Masaharu HatanoAkihiko Takahashi
  • 优先权: JP2008-016785 20080128
  • 国际申请: PCT/JP2009/050607 WO 20090113
  • 主分类号: C22C38/42
  • IPC分类号: C22C38/42 C22C38/28 C21D8/00
HIGH-PURITY FERRITIC STAINLESS STEEL WITH EXCELLENT CORROSION RESISTANCE AND WORKABILITY AND METHOD OF PRODUCTION OF SAME
摘要:
The present invention provides high purity ferrite stainless steel able to reduce deterioration in surface conditions due to pitting corrosion or rusting or other corrosion to an extent no different from SUS304 or better without inviting a drop in manufacturability or workability and without relying on the addition of rare elements, and a method of production of the same, that is, ferritic stainless steel containing, by mass %, C: 0.01% or less, Si: 0.01 to 0.20%, Mn: 0.01 to 0.30%, P: 0.04% or less, S: 0.01% or less, Cr: 13 to 22%, N: 0.001 to 0.020%, Ti: 0.05 to 0.35%, Al: 0.005 to 0.050%, Sn: 0.001 to 1%, and a balance of Fe and unavoidable impurities to which Sn is added to modify the passive film and improve the corrosion resistance. To improve the effect of modification of the passive film by the addition of Sn, after the final annealing, the steel is held in the 200 to 700° C. temperature range for 1 minute or more.
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