Material Name: 50CrVA spring steel

Standard: GB / T 1222-1984
● Features and Scope:
Good mechanical properties and process performance, high hardenability, adding vanadium steel grain refinement, reduce heat sensitivity, improved strength and toughness, high fatigue strength, yield ratio is high, but poor welding cold plastic deformation due to 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, safety valve spring
● Chemical Composition:
Carbon C: 0.46 ~ 0.54
Si Si: 0.17 ~ 0.37
Mn 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, ≤321HB
● Heat treatment and microstructure specifications:
Heat treatment specifications: quenching 850 ℃ ± 20 ℃, oil cooling; tempering 500 ℃ ± 50 ℃ (when special needs, ± 30 ℃).
● Delivery status: hot-rolled steel to heat treatment or heat treatment delivery, cold drawn steel to heat treatment delivery.