Quality carbon structural steel: S50C
● Features and application:
High-strength carbon steel, cold plastic deformation of low weldability, hardenability is poor, but no temper brittleness, cutting fair. Usually in normalizing or quenching and tempering the use, requirements for the manufacture of high wear resistance, the role of dynamic load and the impact of small parts machining parts and springs, such as forged gears, levers, rollers, shafts, friction disc, agricultural digging Plowshare, heavy-duty spindle and so on.
● Chemical Composition:
Carbon C: 0.47 ~ 0.55
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.50 ~ 0.80
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): ≥ 630 (64)
Yield strength σs (MPa): ≥ 375 (38)
Elongation δ5 (%): ≥ 14
Reduction of area ψ (%): ≥ 40
Impact energy Akv (J): ≥ 31 (4)
Impact toughness αkv (J/cm2): ≥ 39 (4)
Hardness: no heat treatment, ≤ 241HB; annealed steel, ≤ 207HB
Sample Size: Sample size is 25mm
● Heat treatment and microstructure specifications:
Heat treatment specifications: normalizing, 830 ℃; quenching, 830 ℃; tempering, 600 ℃.
Microstructure: ferrite + pearlite.
● Delivery status: no heat treatment or heat treatment (annealing, normalizing or tempering) the status of delivery. Demands heat treatment delivery should be specified in the contract, not indicated by no heat treatment delivery.