发明名称 |
Method for manufacturing high-Si austenitic stainless steel |
摘要 |
A high-Si content austenitic stainless steel, which exhibits stable acid resistance and excellent corrosion resistance in high-temperature and concentrated nitric acid, has a chemical composition comprising: C: at most 0.04%; Si: 2.5-7.0%; Mn: at most 10%; P at most 0.03%; S: at most 0.03%; N: at most 0.035%; sol. Al: at most 0.03%; Cr: 7-20%; Ni: 10-22%; optionally, one or more types selected from Nb, Ti, Ta and Zr: 0.05-0.7% in total; and the remainder being Fe and impurities, wherein a total amount of B1 type inclusions measured by a method according to JIS G0555 (2003) Annex 1 “Microscopic Testing for the Non-Metallic Inclusions on the Point Counting Principle” is not more than 0.03% by area %. |
申请公布号 |
US9243314(B2) |
申请公布日期 |
2016.01.26 |
申请号 |
US201214235873 |
申请日期 |
2012.07.26 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
Sukawa Tomoyuki;Yamamoto Shinnya;Takeuchi Kouichi;Kita Hayato;Yoshida Shuuji;Taketsu Katsuhiko;Shibuya Masayuki |
分类号 |
C22C38/48;C22C38/04;C22C38/00;C22C38/06;C22C38/34;C22C38/58 |
主分类号 |
C22C38/48 |
代理机构 |
Clark & Brody |
代理人 |
Clark & Brody |
主权项 |
1. An austenitic stainless steel characterized by having a chemical composition comprising: in mass %, C: at most 0.04%; Si: 2.5-7.0%; Mn: at most 10%; P at most 0.03%; S: at most 0.03%; N: at most 0.035%; sol. Al: at most 0.03%; Cr: 7-20%; Ni: 10-22%; one or more elements selected from Nb, Ti, Ta and Zr: 0-0.7% in total; and the remainder being Fe and impurities, wherein a total amount of B1 type inclusions measured by a method according to JIS G0555 (2003) Annex 1 “Microscopic Testing for the Non-Metallic Inclusions on the Point Counting Principle” is not more than 0.03% by area %, and an amount of SiO2, which is an A2 type inclusion, measured by a method according to JIS G0555 (2003) Annex 1—Microscopic Testing for the Non-Metallic Inclusions on the Point Counting Principle—, is 0.001 to 0.06%. |
地址 |
Tokyo JP |