Executive Standard: JIS G4053-2003
● Features and application:
The wider use of advanced carburizing steel with 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, rod, and the impact of high-speed and work load a variety of gear, adjust the screw, camshaft.
● Chemical Composition:
Carbon C: 0.12 ~ 0.18
Si Si: 0.15 ~ 0.35
Manganese Mn: 0.35 ~ 0.65
Sulfur S: to allow the residual content ≤ 0.030
Phosphorus P: ≤ 0.030 to allow the residual content of chromium Cr: 0.60 ~ 1.00
Ni-Ni: 3.00 ~ 3.50
Copper 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 area 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:
Standard heat treatment: 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.
