35# carbon steel properties

Characteristics of 35# high-quality carbon steel: No. 35 high-quality carbon structural steel (GB/T699) has good plasticity and appropriate strength, good process performance, and acceptable welding performance. Most of them are in normalized and quenched and tempered states. 35# carbon steel is widely used in the manufacture of various forgings and hot-pressed parts, cold-drawn and upsetting steels, seamless steel pipes, and parts in machinery manufacturing, such as crankshafts, rotating shafts, shaft pins, levers, connecting rods, beams, sleeves, wheels Rings, washers, screws, nuts, etc.

35# steel heat treatment specification and metallographic structure:
Heat treatment specification: normalizing, 870; quenching, 850; tempering, 600.
Metallographic structure: ferrite + pearlite.

35# steel delivery status: delivered in the state of no heat treatment or heat treatment (annealing, normalizing or high temperature tempering). If it is required to be delivered in a heat-treated state, it should be indicated in the contract, and if it is not indicated, it will be delivered without heat treatment.

35# carbon steel chemical composition:
Carbon C: 0.32 to 0.39
Silicon Si: 0.17-0.37
Manganese Mn: 0.50-0.80
Sulfur S: ≤0.035
Phosphorus P: ≤0.035
Chromium Cr: ≤0.25
Nickel Ni: ≤0.30
Copper Cu: ≤0.25

35# carbon steel mechanical properties:
Tensile strength σb (MPa): ≥530(54)
Yield strength σs (MPa): ≥315(32)
Elongation δ5 (%): ≥20
Area shrinkage ψ (%): ≥45
Impact energy Akv (J): ≥55
Impact toughness value αkv (J/cm2): ≥69(7)

35# carbon steel heat treatment:
Unheated≤197HB
Sample size: sample size is 25mm
Heat treatment specification and metallographic structure:
Heat treatment specification: normalizing, 870℃; quenching, 850℃; tempering, 600℃.