CPC G04B 37/22 (2013.01) [C21D 1/06 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C21D 2211/001 (2013.01); Y10T 428/12958 (2015.01)] | 4 Claims |
1. A metal material comprising a base material, the base material being a ferritic stainless steel that contains, by mass %, 18 to 22% of Cr, 1.55 to 2.8% of Mo, 0.30 to 0.50% of Nb, 0.1 to 0.8% of Cu, less than 0.5% of Ni, less than 0.8% of Mn, less than 0.5% Si, less than 0.10% of P, less than 0.05% of S, less than 0.05% of N, and less than 0.05% of C, with a remainder thereof being composed of Fe and unavoidable impurities,
wherein the base material is treated with a nitrogen absorption treatment.
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