Alloy structural steel: 12CrNi3A
Standard: GB / T 3077-1988
● Features and Scope:
Is the wider use of advanced carburizing steel, and 15Cr, 20Cr steel compared to its strength, ductility, are high hardenability. Mainly used to produce high strength, high hardness and high toughness requirements for central spindle and high toughness to withstand shock loads or under heavy load conditions, surface wear, heat deformation of the shaft, rod and work at high speed and shock load various transmission gears, adjusting screw, camshaft
● Chemical Composition:
Carbon C: 0.10 ~ 0.17
Si Si: 0.17 ~ 0.37
Mn Mn: 0.30 ~ 0.60
Sulfur S: to allow the residual content ≤0.035
Phosphorus P: to allow the residual content ≤0.035
Chromium Cr: 0.60 ~ 0.90
Ni Ni: 2.75 ~ 3.15
Cu: to allow the residual content ≤0.030
● Mechanical Properties:
Tensile strength σb (MPa): ≥930 (95)
Yield strength σs (MPa): ≥685 (70)
Elongation δ5 (%): ≥11
Reduction of ψ (%): ≥50
Impact energy Akv (J): ≥71
Impact toughness αkv (J / cm2): ≥88 (9)
Hardness: ≤217HB
Sample size: Sample size is 15mm rough
● Heat treatment and microstructure specifications:
Heat treatment specifications: quenching: the first 860 ℃, the second time 780 ℃, oil cooling; tempering 200 ℃, water-cooled, air-cooled.
● Delivery status: to heat treatment (normalizing, annealing or tempering) or without heat treatment delivery, the delivery status should be specified in the contract.