发明名称 | Cr-containing austenitic alloy tube and method for producing the same | ||
摘要 | There is provided a Cr-containing austenitic alloy tube, wherein a chromium oxide film with a thickness of 0.05 to 1.5 μm having the relationship defined by Formula (i) is formed on the inner surface of the tube, wherein the average concentration of C in the depth range of 5 to 10 μm from the inner surface is lower than the concentration of C in a base metal; 0.4≦δ1/δ2≦2.5 (i) wherein δ1 and δ2 are thicknesses (μm) of the chromium oxide film at both ends of tube, respectively. | ||
申请公布号 | US9255319(B2) | 申请公布日期 | 2016.02.09 |
申请号 | US201113819072 | 申请日期 | 2011.08.12 |
申请人 | NIPPON STEEL & SUMITOMO METAL CORPORATION | 发明人 | Masaki Yasuhiro;Tasaka Masahito;Kanzaki Manabu;Uehira Akihiro;Kinomura Shoji |
分类号 | C23C8/18;F16L9/02;C22C19/05;G21D1/00;C21D6/00;C21D8/10;C22C38/00;C22C38/02;C22C38/04;C22C38/42;C21D9/08;C22F1/00;C22F1/10;G21F9/28;C22C38/58 | 主分类号 | C23C8/18 |
代理机构 | Clark & Brody | 代理人 | Clark & Brody |
主权项 | 1. A Cr-containing austenitic alloy tube exhibiting corrosion resistance and enhanced strength, wherein the Cr-containing austenitic alloy tube consists of, by mass percent, C: 0.01 to 0.15%, Si: 1.00% or less, Mn: 2.0% or less, P: 0.030% or less, S: 0.030% or less, Cr: 10.0 to 40.0%, Ni: 8.0 to 80.0%, Ti: 0.5% or less, Cu: 0.6% or less, Al: 0.5% or less, and N: 0.01 to 0.20%, a balance being Fe and impurities, and wherein a chromium oxide film with a thickness of 0.05 to 1.5 μm having a relationship defined by Formula (i) is formed on an inner surface of the tube, wherein an average concentration of C in a depth range of 5 to 10 μm from the inner surface is lower than a concentration of C in a wall thickness central portion of the tube; 0.4≦δ1/δ2≦2.5 (i)wherein δ1 and δ2 are thicknesses (μm) of the chromium oxide film at both ends of tube, respectively. | ||
地址 | Tokyo JP |