Shanghai to the United Steel Co., Ltd.


  Material Name: 55SiMnVB spring steel


  55SiMnVB spring steel properties and combined range:


  55SiMnVB spring steel alloy element content is low, than high hardenability, toughness, ductility and higher, a small tendency to decarburization, tempering chaos is good, good function of thermal processing, low capital. Production of heavy, medium and small cars, and other medium-sized cross-section of leaf spring leaf spring and coil spring.


  55SiMnVB spring steel 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


  55SiMnVB spring steel mechanical function:

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