Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Etsuo Dan

Takahiro Osuki

Tomohiko Omura

Jun Nakamura

Hirokazu Okada

Yoshitaka Nishiyama

Masaaki Terunuma

There is provided an austenitic stainless steel having a high strength and an excellent hydrogen brittleness resistance and further having an excellent machinability. The austenitic stainless steel of the present embodiment has a chemical composition including: in mass %, C: 0.10% or less; Si: 1.0% or less; Mn: 2.1 to 6.0%; P: 0.045% or less; S: 0.1% or less; Ni: 8.0 to 16.0%; Cr: 15.0 to 30.0%; Mo: 1.0 to 5.0%; N: 0.05 to 0.45%; Nb: 0 to 0.50%; and V: 0 to 0.50%, with the balance being Fe and impurities, and satisfying Formula (1). The austenitic stainless steel of the present embodiment has a grain size number of less than 8.0 and a tensile strength of 690 MPa or more.15&#x2264;12.6C+1.05Mn+Ni+15N&#x2003;&#x2003;(1)

Austenitic stainless steel and method for producing the same

There is provided a carburization resistant metal material suitable as a raw material for cracking furnaces, reforming furnaces, heating furnaces, heat exchangers, etc. in petroleum and gas refining, chemical plants, and the like. This metal material consists of, by mass %, C: 0.03 to 0.075%, Si: 0.6 to 2.0%, Mn: 0.05 to 2.5%, P: 0.04% or less, S: 0.015% or less, Cr: higher than 16.0% and less than 20.0%, Ni: 20.0% or higher and less than 30.0%, Cu: 0.5 to 10.0%, Al: 0.15% or less, Ti: 0.15% or less, N: 0.005 to 0.20%, and O (oxygen): 0.02% or less, the balance being Fe and impurities. The metal material may further contain one kind or more kinds of Co, Mo, W, Ta, B, V, Zr, Nb, Hf, Mg, Ca, Y, La, Ce and Nd.

Carburization resistant metal material

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Amagasaki, Japan

Etsuo Dan