55SiMnVB spring steel

Standard: GB / T 1222-1984
● Features and application:
Low content of alloying elements, than 60Si2Mn high hardenability, toughness, ductility and higher, a small tendency to decarburization, tempering good stability, thermal processing performance and low cost. 60Si2MnA production instead of heavy, medium and small cars, and other medium-sized cross-section of leaf spring leaf spring and coil spring.
● Chemical Composition:
Carbon C: 0.52 ~ 0.60
Si Si: 0.70 ~ 1.00
Manganese Mn: 1.00 ~ 1.30
Sulfur S: ≤ 0.035
Phosphorus P: ≤ 0.035
Chromium Cr: ≤ 0.35
Ni-Ni: ≤ 0.35
Copper Cu: ≤ 0.25
Vanadium V: 0.08 ~ 0.16
Boron B: 0.0005 ~ 0.0035
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 1372 (140)
Yield strength σs (MPa): ≥ 1225 (125)
Elongation δ10 (%): ≥ 5
Reduction of area ψ (%): ≥ 30
Hardness: hot, ≤ 321HB; cold-drawn + heat treatment, ≤ 321HB