Chemical composition:
Chemical Composition
C Si Mn P S Ni Cr Cu
≤
30 0.27 to 0.34 0.17 to 0.37 0.50 to 0.80 0.30 0.25 0.25 0.035 0.035
35 0.32 to 0.39 0.17 to 0.37 0.50 to 0.80 0.30 0.25 0.25 0.035 0.035

Mechanical properties:
Grades blank sample
Size
/ mm heat treatment process of the mechanical properties of the steel hardness delivery status
/ HBS
Normalizing quenching and tempering σb / MPa σs / MPa δ5 (%) ψ (%) Ak / J ≤
≥ No heat annealed steel
30 25 8,808,606,004,902,952,150 63 179
35 25 8,708,506,005,303,152,045 55 197

Characteristics and Uses:
30: for forging and hot stamping machinery parts, cold drawn, heavy and general machinery shaft, rod, rings, as well as on the use of machinery castings, such as cylinder, turbine frame, rolling mill frame and parts, machine frame and flywheel.
35: for the production of hot forging and hot stamping machinery parts, cold-drawn and cold forging steel, seamless steel tubes, machinery manufacturing parts, castings, heavy and medium machine manufacture forged crankshafts, cylinder compressor, gear shaft, the turbine can also be used to cast the body, the flywheel and the equalizer.