Nippon Steel Sumitomo Metal Corporation

Tomoyuki Sukawa

Kouichi Takeuchi

Masayuki Shibuya

Hayato Kita

Shuuji Yoshida

Shinnya Yamamoto

Katsuhiko Taketsu

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 Btype 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 %.

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Joetsu, Japan

Tomoyuki Sukawa