Executive Standard: ASTM A29/A29M-04
● Features and application:
A high static strength, impact toughness and high fatigue limit, hardenability than 40Cr high temperature under high creep strength and rupture strength of long-term operating temperature up to 500 ℃; cold plastic deformation of the middle, poor welding. Used in high load of the important structural components, such as vehicle and engine transmission parts; turbine rotor, spindle, heavy loads of drive shaft, a large cross-section parts.
● Chemical Composition:
Carbon C: 0.33 ~ 0.38
Si Si: 0.15 ~ 0.35
Manganese Mn: 0.70 ~ 0.90
Sulfur S: allow the residual content ≤ 0.040
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.80 ~ 1.10
Ni: to allow the residual content of ≤ 0.030
Copper Cu: to allow the residual content ≤ 0.030
Mo Mo: 0.15 ~ 0.25
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 985 (100)
Yield strength σs (MPa): ≥ 835 (85)
Elongation δ5 (%): ≥ 12
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 63
Impact toughness αkv (J/cm2): ≥ 78 (8) hardness: ≤ 229HB Sample Size: Sample size is 25mm ● rough heat treatment and microstructure specifications: standard heat treatment: quenching 850 ℃, oil cooling; tempering 550 ℃, water-cooled, oil-cooling.
● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract
