35CrMnSi Material Name: Alloy structural steel grades: 35CrMnSi Standard: GB / T 3077-1988 
 35CrMnSi steel is a low alloy high strength steel, heat treatment after the good mechanical properties, high strength, adequate toughness, hardenability, weldability, formability processing are good, but the corrosion resistance and oxidation resistance is low, is the isothermal quenching and tempering or after the use. 35CrMnSi hardenability of steel is a better material, obtained after heat treatment by the appropriate strength, hardness, toughness and fatigue strength better mechanical properties, coal production can meet the more complex working conditions. 
 ● Chemical Composition: C: 0.32 ~ 0.39 
 35CrMnSi alloy steel 
 Si Si: 1.10 ~ 1.40 Manganese Mn: 0.80 ~ 1.10 S S: to allow the residual phosphorus content ≤ 0.025 P: ≤ 0.025 to allow the residual content of chromium Cr: 1.10 ~ 1.40 Ni: to allow the residual content ≤ 0.030 Copper Cu: allow the residual content ≤ 0.025 
 ● Mechanical Properties: Tensile σb (MPa): ≥ 1620 (165) yield strength σs (MPa): ≥ 1275 (130) Elongation δ5 (%): ≥ 9 Reduction of area ψ (%): ≥ 40 impacts Power Akv (J): ≥ 31 impact toughness αkv (J/cm2): ≥ 39 (4) Hardness: ≤ 241HB sample size: Sample 
 ● Heat treatment and microstructure specifications: Heat treatment specifications: 1) quenching: the first 950 ℃, the second 890 ℃, oil-cooling; tempering 230 ℃, air cooling, oil cooling; 2) 880 ℃ at 280 ~ 310 ℃ austempering . 
 ● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.