Nondestructive evaluation for remanent life of aged 12Cr ferrite heat resisting steel by reversible permeability

► Magnetic, nondestructive evaluation method of remanent life of 12Cr ferritic steel is presented. ► Peak interval of reversible permeability decreases with the increase of aging time. ► Mechanical properties decrease with the increase of aging time. ► Magnetic and mechanical properties are decreased with increase of Larson-Miller parameter. ► Reversible permeability is nondestructively used to estimate remanent life of 12Cr ferrite steel.