Fe Mn Si alloy castings with excellent low cycle fatigue properties

摘要

PROBLEM TO BE SOLVED: To provide a novel Fe-Mn-Si-based alloy casting material useful as a building material for structure or the like, and excellent in low cycle fatigue property.SOLUTION: There is provided an Fe-Mn-Si-based alloy casting material containing Mn and Si as essential component elements, and one or more kind of Cr, Ni, Al and C as an optional component element, and having a component composition with 5 mass%≤Mn≤35 mass%, 1.5 mass%≤Si≤6.5 mass%, Cr≤15 mass%, Ni≤15 mass%, Al≤3 mass%, C≤0.4 mass% and the balance Fe with inevitable impurities, and satisfying a condition of the formula (a). Formula (a):37<[%Mn]+0.3[%Si]+0.7[%Cr]+2.4[%Ni]+5.2[%Al]+28[%C]<45 and Formula (b):[%Ni]+30[%C]+0.5[%Mn]>0.75[%Cr]+1.125[%Si]+2[%Al].SELECTED DRAWING: Figure 2