50CrVA has good mechanical properties and process performance, high hardenability, adding vanadium to steel the grain refinement, reduce heat sensitivity, increased strength and toughness, high fatigue strength, yield ratio is high, but poor welding, cold plastic deformation due to the low. Is a relatively high spring, as a large section of the important spring and high-load operating temperature <300 ℃ of the valve spring, piston spring, valve spring. General, supply specifications for the 1.5 ~ 10.0MM between, multi-annealed state. State for the hot-rolled coil, the use of annealing to reduce the hardness of the ball in order to create conditions for further processing.

Chemical composition:
Carbon C: 0.46 ~ 0.54


Si Si: 0.17 ~ 0.37


Manganese Mn: 0.50 ~ 0.80


Sulfur S: ≤ 0.030


Phosphorus P: ≤ 0.030


Chromium Cr: 0.80 ~ 1.10


Ni-Ni: ≤ 0.35


Copper Cu: ≤ 0.25


Vanadium V: 0.10 ~ 0.20

Mechanical properties:
Tensile strength σb (MPa): ≥ 1274 (130)


Yield strength σs (MPa): ≥ 1127 (115)


Elongation δ5 (%): ≥ 10


Reduction of area ψ (%): ≥ 40


Hardness: hot, ≤ 321HB; cold-drawn + heat treatment, ≤ 321HB