Iron alloy

特許 権利維持 PROBLEM TO BE SOLVED: To provide an iron alloy having high yield strength and tensile strength, extremely low work-hardening rate and excellent ductility, corrosion resistance and oxidation resistance. ; SOLUTION: The low work-hardening iron alloy has a composition which is in a region A enclosed with lines connecting four points in a diagram (shown in a figure) of Cr equivalent represented by [Cr equivalent(%)=(Cr%+1.21Mo%+0.48Si%+2.48Al%)] (by mass, the same applies to the following) versus Ni equivalent represented by [Ni equivalent(%)=(Ni%+0.11Mn%-0.0086(Mn%)<SP>2</SP>+24.5C%)] and has the balance Fe with inevitable impurities.