FE-MN-SI-BASED ALLOY CASTING MATERIAL HAVING EXCELLENT LOW-CYCLE FATIGUE PROPERTIES

摘要

The present invention provides a new Fe-Mn-Si-based cast alloy having excellent low-cycle fatigue properties that is useful as a structural building material or the like. An Fe-Mn-Si-based cast alloy according to one embodiment of the present invention contains Mn and Si as an essential component element, and one or more of Cr, Ni, Al, and C as an optional component element. The Fe-Mn-Si-based cast alloy has a component composition being 5 mass% ≤ Mn ≤ 35 mass%, 1.5 mass% ≤ Si ≤ 6.5 mass%, 0 mass% ≤ Cr ≤ 15 mass%, 0 mass% ≤ Ni ≤ 15 mass%, 0 mass% ≤ Al ≤ 3 mass%, and 0 mass% ≤ C ≤ 0.4 mass%, with the balance being Fe and inevitable impurities, and the component composition satisfies conditions of Formula (a): 37 [%Mn] + 0.3[%Si] + 0.7[%Cr] + 2.4[%Ni] + 5.2[%A] + 28[%C] 45, and Formula (b): [%Ni] + 30[%C] + 0.5[%Mn] 0.75[%Cr] + 1.125[%Si] + 2[%Al].