Grade: 50CrVA
Standard No.:
Q/BQB516-2009
Features and application:
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. Chongqing Special Steel Factory 50CrVA are generally annealed plate, eliminating the need for annealing treatment.
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
