Chemical composition:
Chemical Composition
C Si Mn P S Ni Cr Cu
≤
60 0.57 to 0.65 0.17 to 0.37 0.50 to 0.80 0.30 0.25 0.25 0.035 0.035
65 0.62 to 0.70 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
60 25 8,106,754,001,235,255,229
65 25 8,106,954,101,030,255,229

Characteristics and Uses:
60 steel strength, hardness and elasticity are quite high, but when the cold plastic deformation is low, poor machinability, weldability and hardenability is poor, water quenching cracks tend to have only small parts can be quenched, large multi-normalizing for the manufacture of rollers, shafts, eccentric shafts, spring rings, cam, spring washers, clutch, rope and other larger force, working under the friction conditions, requiring high strength, wear resistance and elasticity of certain parts
65 steel, for the manufacture of springs, coil springs, various gaskets, clutches and shaft manufacturing general machinery, roller, eccentric shaft.