Cold heading steel wire cold drawn ML45 wire rod small size disc round annealing wire

ML45 cold heading steel

Material name: cold heading steel

Brand: ML45

Standard: GB/T 6478-1986

●Chemical composition:

Carbon C: 0.42～0.50 (allowable deviation: ±0.01)

Silicon Si: ≤0.20

Manganese Mn: 0.30～0.60 (allowable deviation: ±0.02)

Sulfur S: ≤0.035

Phosphorus P: ≤0.035

Chromium Cr: Allowed residual content ≤0.020

Nickel Ni: Allowed residual content ≤0.020

Copper: Allowed residual content ≤0.020

●Mechanical properties:

Tensile strength σb (MPa): ≥598(61)

Yield strength σs (MPa): ≥353(36)

Elongation δ5 (%): ≥16

Area shrinkage ψ (%): ≥40

Hardness: (hot rolling) ≤ 229HB, indentation diameter ≥ 4.0mm; (annealing) ≤ 197HB, indentation diameter ≥ 4.3mm

●Heat treatment specifications and metallographic structure:

Heat treatment specifications: Heating to a temperature 30 to 50°C higher than the AC3 critical point, holding time not less than 30 minutes, air cooling.

●Delivery status: Delivered in hot-rolled state. It can also be delivered in annealed state by mutual agreement.

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