Quality carbon structural steel: C35
● Features and Scope:
Medium-sized machinery used in the manufacture of bolts, nuts, levers and so on.
● Chemical Composition:
Carbon C: 0.32 ~ 0.40
Si Si: 0.17 ~ 0.37
Mn Mn: 0.70 ~ 1.00
Sulfur S: ≤0.035
Phosphorus P: ≤0.035
Chromium Cr: ≤0.25
Ni Ni: ≤0.25
Copper Cu: ≤0.25
● Mechanical Properties:
Tensile strength σb (MPa): ≥560 (57)
Yield strength σs (MPa): ≥335 (34)
Elongation δ5 (%): ≥18
Reduction of ψ (%): ≥45
Impact energy Akv (J): ≥55
Impact toughness αkv (J / cm2): ≥69 (7)
Hardness: no heat, ≤229HB; annealed steel, ≤197HB
Sample size: Sample size is 25mm
● Heat treatment and microstructure specifications:
Heat treatment specifications: normalizing, 870 ℃; quenching, 850 ℃; tempering, 600 ℃.
● Delivery status: to heat or no heat treatment (annealing, normalizing or tempering) state delivery. Require heat treatment delivery should be specified in the contract, no heat treatment is not indicated by delivery.