Chemical composition

   Carbon C: 0.52 ~ 0.60

Si Si: 1.50 ~ 2.00

Manganese Mn: 0.60 ~ 0.90

Sulfur S: ≤ 0.035

Phosphorus P: ≤ 0.035

Chromium Cr: ≤ 0.35

Ni-Ni: ≤ 0.35

Copper Cu: ≤ 0.25



Mechanical properties
Tensile strength σb (MPa): ≥ 1274 (130)

Yield strength σs (MPa): ≥ 1176 (120)

Elongation δ10 (%): ≥ 6

Reduction of area ψ (%): ≥ 30

Hardness: hot, ≤ 302HB; cold-drawn + heat treatment, ≤ 321HB [3]

 

 

 

55SiMnB spring steel specifications: (2mm × L × W) (Ф10-20mm)
55SiMnB spring steel specifications: (3mm × L × W) (Ф20-30mm)
55SiMnB spring steel specifications: (4mm × L × W) (Ф30-40mm)
55SiMnB spring steel specifications: (5mm × L × W) (Ф40-50mm)
55SiMnB spring steel Specification: (6mm × L × W) (Ф50-60mm)
55SiMnB spring steel specifications: (7mm × L × W) (Ф60-70mm)
55SiMnB spring steel Specification: (8mm × L × W) (Ф70-80mm)
55SiMnB spring steel specifications: (9mm × L × W) (Ф80-90mm)
55SiMnB spring steel Specification: (10mm × length × width) (Ф90-100mm)
55SiMnB spring steel Specification: (11mm × length × width) (Ф100-110mm)
55SiMnB spring steel Specification: (12mm × length × width) (Ф110-120mm)