Sumitomo Metal Industries, Inc.

Junichi Yamashita

Morio Kawasaki

Hiroshi Yamaoka

Hideyasu Kawanami

Toshihiro Shiino

Tuyeres for a blast furnace are disclosed wherein a coating is formed on the inner and outer peripherential surfaces of the tuyere body by subjecting the surfaces to a calorizing treatment to diffuse a diffusion agent comprising a powdery mixture of alumina and aluminum at a treating temperature of about 800.degree. C. The tuyere body is shaped so as to form an inner jacket, and the walls of the tuyere body forming the inner jacket may also be subjected to a calorizing treatment.

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Wakayama, Japan

Junichi Yamashita