发明授权
- 专利标题： Austenitic stainless steel pipe excellent in steam oxidation resistance and manufacturing method therefor
- 专利标题（中）： 奥氏体不锈钢管耐蒸汽抗氧化性优良及其制造方法
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申请号： US13486503申请日： 2012-06-01
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公开(公告)号： US08852362B2公开(公告)日： 2014-10-07
- 发明人: Yoshitaka Nishiyama , Mitsuru Yoshizawa , Masahiro Seto , Katsuki Tanaka
- 申请人： Yoshitaka Nishiyama , Mitsuru Yoshizawa , Masahiro Seto , Katsuki Tanaka
- 申请人地址： JP Tokyo
- 专利权人： Nippon Steel & Sumitomo Metal Corporation
- 当前专利权人： Nippon Steel & Sumitomo Metal Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Clark & Brody
- 优先权： JP2010-131613 20100609
- 主分类号： C22C38/18
- IPC分类号： C22C38/18 ; C21D11/00 ; C22C38/40 ; C21D7/06 ; B21C37/30 ; F28F21/08 ; C22C38/04 ; C21D9/00 ; C22C38/00 ; C22C38/42 ; B21K21/00 ; B21C37/06 ; F16L9/02 ; C22C38/02 ; C21D6/00 ; F22B37/10 ; C22C38/48 ; C21D8/10 ; C21D9/08 ; C22C38/44
摘要：
There is provided an austenitic stainless steel pipe excellent in steam oxidation resistance. The austenitic stainless steel pipe excellent in steam oxidation resistance contains, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni, and is configured so that a region satisfying the following Formula exists in a metal structure at a depth of 5 to 20 μm from the inner surface of the steel pipe: (α/β)×δ/ε×100≧0.3 where the meanings of symbols in the above Formula are as follows: α: sum total of the number of pixels of digital image in region in which orientation difference of adjacent crystals detected by electron backscattering pattern is 5 to 50 degrees β: the number of total pixels of digital image in region of measurement using electron backscattering pattern ε: analysis pitch width of electron backscattering pattern (μm) δ: grain boundary width (μm).