SNC815 alloy structural steel: SNC815 Executive Standard: JIS G4053-2003 ● Features and Scope: is the wider use of high-hardened steel, and 15Cr, 20Cr steel compared to its strength, ductility, hardenability are high. Mainly used to produce heavy-duty conditions requiring high strength, high hardness and high toughness requirements of central spindle and high toughness or shock loading, surface wear, heat deformation of the shaft, and the impact rod and high work load a variety of gear, adjust the screw, camshaft. ● Chemical Composition: C: 0.12 ~ 0.18 Si Si: 0.15 ~ 0.35 Manganese Mn: 0.35 ~ 0.65 S S: to allow the residual phosphorus content ≤ 0.030 P: ≤ 0.030 to allow the residual content 
 SNC815 steel structure 
 Chromium Cr: 0.60 ~ 1.00 Nickel Ni: 3.00 ~ 3.50 Copper Cu: allow the residual content ≤ 0.030 ● Mechanical Properties: Tensile σb (MPa): ≥ 930 (95) yield strength σs (MPa): ≥ 685 (70) stretch growth rate δ5 (%): ≥ 11 Reduction of ψ (%): ≥ 50 Impact energy Akv (J): ≥ 71 impact toughness αkv (J/cm2): ≥ 88 (9) Hardness: ≤ 217HB sample size : the sample blank standard size 15mm ● Heat treatment and microstructure: heat treatment specifications: quenching: the first 860 ℃, the second 780 ℃, oil-cooling; tempering 200 ℃, water, air-cooled. ● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract