24 July 2021 Spring Steel Wire
30W4Cr2VA Spring Steel Bar
30W4Cr2VA is high peformance spring steel, due to the metal element of tungsten chromium vanadium melt in, this steel has good room temperature and high temperature mechanical properties and particularly high hardenability, good tempering stability, good hot workability. Used in the quenched and tempered state, used as the working temperature ≤ 500 ℃ following the heat-resistant springs, such as the main boiler safety valve springs, steam turbine seal spring leaves.
Chemical Composition:
| C(%): | SI(%): | Mn(%): | S (%): | P (%): | Cr(%): | Ni(%): | Cu(%): | V(%): | W(%): |
|---|---|---|---|---|---|---|---|---|---|
| 0.26~0.34 | 0.17~0.37 | ≤0.40 | ≤0.030 | ≤0.030 | 2.00~2.50 | ≤0.35 | ≤0.25 | 0.50~0.80 | 4.0~4.5 |
Mechanical properties:
(1) heat treatment: 1050 ~ 1100 ℃ oil quenching, 600 ℃ tempering
Tensile strength σs (Mpa): ≥ 1470
Yield strength σs (MPa): ≥ 1320
Elongation δ10 (%): ≥7
Impact work: ≥40
(2) heat treatment: 740 ~ 780 ℃ tempering
Tensile strength σs (Mpa): ≥ 862
Yield strength σs (MPa): ≥ 743
Elongation rate δ10 (%): ≥13.8
Impact work: ≥52.5
(3) heat treatment: oil quenching at 1030 ℃, tempering at 600 ℃
Tensile strength σs (Mpa): ≥ 1725
Yield strength σs (MPa): ≥ 1600
Elongation δ10 (%): ≥10.3
Impact work: ≥47.8
Hardness HRC: 48.5
Delivery Status:
Hot Rolled + Heat Treatment, ≤321HB; Cold Drawn + Heat Treatment, ≤321HB
Heat treatment specifications:
Hot-rolled steel to heat treatment or non-heat treatment delivery, cold-drawn steel to heat treatment delivery.
Metallography:
Quenching 1050 ~ 1100 ℃, oil cooling; tempering 600 ℃ ± 50 ℃ (special needs, ± 30 ℃).