Material Name: Alloy Steel
Grade: 40MnB
Standard: GB / T 3077-1988
● Features and application:
High strength, hardness, wear resistance and good toughness, is an alternative to the more successful new 40Cr steel steel. Used cars on the steering arm, steering knuckle, steering shaft, axle, worm, spline shaft, brake adjustment arm, but also a larger cross-section instead of 40Cr steel parts.
● Chemical Composition:
Carbon C: 0.37 ~ 0.44
Si Si: 0.17 ~ 0.37
Manganese Mn: 1.10 ~ 1.40
Sulfur S: to allow the residual content of ≤ 0.35
Phosphorus P: allow the residual content of ≤ 0.35
Chromium Cr: allow the residual content of ≤ 0.30
Ni: to allow the residual content of ≤ 0.30
Copper Cu: to allow the residual content of ≤ 0.30
Boron B: 0.0005 ~ 0.0035
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 980 (100)
Yield strength σs (MPa): ≥ 785 (80)
Elongation δ5 (%): ≥ 10
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 47
Impact toughness αkv (J/cm2): ≥ 59 (6)
Hardness: ≤ 207HB
Sample size: Sample size is 25mm rough
● Heat treatment and microstructure specifications:
Standard heat treatment: quenching 850 ℃, oil cooling; tempering 500 ℃, 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.