40CrNiMoA 
 40CrNiMoA alloy steel referred to as structural steel, 40CrNiMoA is one of structural steel, also known as alloy steel, which is high-quality carbon structural steel, based on the appropriate add one or more alloying elements (not the total content more than 5%) and made of steel. Implementation of standards GB/T3077-1999. Uniform digital code A50403; grade 40CrNiMoA; chemical composition%: C C: 0.37 ~ 0.44 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.50 ~ 0.80 S S: to allow the residual phosphorus content ≤ 0.025 P: ≤ 0.025 to allow the residual content of chromium Cr: 0.60 0.90 Ni-Ni: 1.25 ~ 1.65 Copper Cu: Mo allow the residual content ≤ 0.025 Mo: 0.15 ~ 0.25 ● Mechanical Properties: Tensile σb (MPa): ≥ 980 (100) yield strength σs (MPa): ≥ 835 (85 ) Elongation δ5 (%): ≥ 12 Reduction of area ψ (%): ≥ 55 Impact energy Akv (J): ≥ 78 impact toughness αkv (J/cm2): ≥ 98 (10) Specimen size: test kind of rough dimensions 25mm heat treatment: (quenching 850 degrees; cooling agent: oil; tempering temperature of 600 degrees; coolant: water, oil); annealing or tempering of steel supply status Brinell hardness less than or equal GBW 269; delivery Status: heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract. Uses: used for high strength, high toughness, cross-sectional size larger and more important conditioning parts, such as horizontal transmission eccentric shaft forging machine, forging machine crank.