What material is 50CrV4 alloy steel plate? What is the equivalent material?

Hardness of 50CrV4 spring steel plate: annealing hardness: less than 250hb, quenching hardness: 55HRC.
50CrV4 executive standard: DIN 17221-88.
50CrV4 steel belongs to alloy spring steel, 50CrV4 is German standard steel grade, corresponding to China is 50CrVA.

50CrV4 steel has good mechanical and technological properties and high hardenability. Adding vanadium can refine the grain size, reduce the overheat sensitivity, improve the strength and toughness, have high fatigue strength and yield ratio, but poor weldability and low cold deformation plasticity.

50CrV4 steel is a kind of advanced spring, which is used as the important spring with large cross section and valve spring, piston spring and safety valve spring with working temperature less than 300℃.