Patent ID: 8815147
Filing Date: 2014-08-26
Classification: C22C

Abstract:
1. A cold die steel excellent in characteristics of suppressing dimensional change, consisting of, by mass %, carbon (C): 0.7% or more and less than 1.6%, silicon (Si): 0.5 to 3.0%, manganese (Mn): 0.1 to 3.0%, phosphor (P): less than 0.05% including 0%, sulfur (S): 0.01 to 0.12%, chromium (Cr): 7.0 to 9.12%, one or two elements selected from the group consisting of molybdenum (Mo) and tungsten (W): amounts satisfying the formula: (Mo+(W/2))=0.5 to 1.7%, vanadium (V): less than 0.7% including 0%, nickel (Ni): 0.3 to 1.5%, copper (Cu): 0.1 to 1.0%, aluminum (Al): 0.1 to 0.7%, and the balance being iron and unavoidable impurities, wherein amounts of nickel and aluminum satisfy the formula: Ni/Al=1 to 3.7, and wherein amounts of chromium and carbon satisfy the formulas by mass %: (Cr−4.2×C)=5 or less, and (Cr−6.3×C)=1.4 or more.