What is the 51CrV4 steel chemical composition and properties

51CrV4(1.8159) spring steel has good mechanical and technological properties, high hardenability, adding vanadium to refine the grain of the steel, reduce overheating sensitivity, improve strength and toughness, and have high fatigue strength and yield ratio. Higher, but poor weldability, low plasticity due to cold deformation.

51CrV4 steel is a higher-grade spring, used as a high-load important spring with a larger section and a valve spring, piston spring and safety valve spring with an operating temperature of <300 ℃.

Chemical composition of 51CrV4 steel
Carbon C: 0.47～0.55
Silicon Si: ≤0.40
Manganese Mn: 0.70～1.10
Sulfur S: ≤0.030
Phosphorus P: ≤0.030
Chromium Cr: 0.90～1.20
Nickel Ni: ≤0.35
Copper Cu: ≤0.25
Vanadium V: 0.10～0.2

Mechanical properties of 51CrV4 steel
Tensile strengthσb (MPa): ≥1274(130)
Yield strengthσs (MPa): ≥1127(115)
Elongationδ5 (%): ≥10
Reduction of areaψ(%): ≥40