PRECIPITATION HARDENING-TYPE MARTENSITE-BASED STAINLESS STEEL AND UNDERGROUND EXCAVATION DRILL COMPONENT

摘要

This precipitation hardening-type martensite-based stainless steel and this underground excavation drill using the same, contain C0.10 mass%, 0.01≤Si≤0.10 mass%, 0.01≤Mn≤0.10 mass%, P≤0.010 mass%, S≤0.010 mass%, 10.0≤Ni≤16.0 mass%, 8.0≤Cr≤10.9 mass%, 1.0≤Mo≤2.5 mass%, 0.001≤N≤0.010 mass%, 0.40≤Al≤1.40 mass%, Cu0.10 mass%, 0.30≤Ti≤1.40 mass%, and 0≤Nb≤0.50 mass%, the remaining portion being Fe and unavoidable impurities, wherein 1.00 ≤ [Al]+[Ti]+[Nb] ≤ 2.00, 5.50 ≤ [Ni]/([Al]+[Ti]+[Nb]) ≤ 12.00, 10.00≤Ni_eq≤17.00, and 12.00≤Cr_eq≤17.00 are satisfied.