Austenitic stainless steel for hydrogen gas and method for its manufacture
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[0051] The chemical composition of an austenitic stainless steel according to the present invention and the reasons for limits thereon will be explained below in detail. In this specification, percent with respect to the chemical composition of steel means mass percent unless otherwise specified.
[0052] The content of C is made at most 0.10%. In an austenitic stainless steel, there are often cases in which corrosion resistance is increased by precipitation of M23C6-type carbides (M is Cr, Mo, Fe, or the like) or MC-type carbides (M is Ti, Nb, Ta, or the like), but in a steel according to the present invention, precipitation of carbides is not mandatory. Rather, there are cases in which precipitation at grain boundaries has an adverse effect on toughness and the like after cold working. Thus, C is limited to at most 0.10%. The lower the content of C the better, and preferably it is at most 0.04%. Taking into consideration refining costs, it is...
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