Material Name: high quality carbon structural steel
Grade: 35Mn
Standard: GB / T 699-1988
● Features and application:
Strength and high hardenability than 30Mn, cold plastic deformation of the medium can be cut is good, but welding is poor. Should be quenched before use. Applied to the shaft. Bolts. Nuts. Screws, spindles. Gear.
Medium-sized machinery for the manufacture of bolts, nuts, levers and so on.

     ● Chemical Composition:

Carbon C: 0.32 ~ 0.40

Si Si: 0.17 ~ 0.37

Manganese Mn: 0.70 ~ 1.00

    Sulfur S: ≤ 0.035

    Phosphorus P: ≤ 0.035

Chromium Cr: ≤ 0.25

Ni-Ni: ≤ 0.30

    Copper Cu: ≤ 0.25

     ● Mechanical Properties:

Tensile strength σb (MPa): ≥ 560 (57)

Yield strength σs (MPa): ≥ 335 (34)

Elongation δ5 (%): ≥ 18

Reduction of area ψ (%): ≥ 45

Impact energy Akv (J): ≥ 55

Impact toughness αkv (J/cm2): ≥ 69 (7)

Hardness: no heat treatment ≤ 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: 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.