51CrV4 alloy steel (1.8159) spring steel has good mechanical and technological properties and high hardenability. The addition of vanadium can refine the grain size of the steel, reduce the overheating sensitivity, and improve the strength and toughness. The 51CrV4 alloy steel has high fatigue strength, high yield ratio, but poor weldability and low cold deformation plasticity.
51CrV4 alloy steel is a kind of high-grade spring, which is used as important spring with large cross-section and valve spring, piston spring and safety valve spring with working temperature less than 300℃.
Mechanical properties of 51CrV4 alloy steel
Tensile strengthσB (MPA): ≥1274 (130)
Yield strengthσs (MPA): ≥1127 (115)
Elongationδ5 (%): ≥10
Reduction of areaψ(%): ≥40
Hardness: hot rolling, ≤321HB; cold drawing + heat treatment, ≤321HB
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