51CrV4 spring steel has good mechanical properties with high hardenability. Adding vanadium (V) refines the grain of steel, it reduces overheat sensitivity and improves strength and toughness. 51CrV4 steel heat treatment has high fatigue strength and a high yield ratio.

D6A steel is an alloy steel containing chromium, molybdenum, cobalt, nickel and other elements. D6A steel has excellent high temperature strength, high toughness and high wear resistance, so it is widely used in band saws, aviation, aerospace, automobile, machinery and other fields.