SNCM439 Steel Official Price

Alloy structural steel: SNCM439

Corresponding British brand: 817M40, 816M40

Chemical Composition of SNCM439

C: 0.36~0.43
Si: 0.15~0.35
Mn: 0.60~0.90
S: Allowable residual content≤0.025
P: Allowable residual content≤0.025
Cr: 0.60~1.00
Ni: 1.60~2.00
Cu: Allowable residual content≤0.025
Mo: 0.15~0.30

SNCM439 Steel Mechanical properties:

Tensile strength σb (MPa): ≥ 980 (100)
Yield strength σs (MPa): ≥ 835 (85)
Elongation δ5 (%): ≥12
Area shrinkage ψ (%): ≥ 55
Impact work Akv (J): ≥78
Impact toughness value αkv (J/cm2): ≥98(10)
Hardness: ≤ 269HB
Sample size: sample blank size is 25mm

SNCM439 Heat treatment specifications and metallographic organization:

Heat treatment specification: quenching 850 ° C, oil cooling; tempering 600 ° C, water cooling, oil cooling.

Delivery status of SNCM439 Steel: Delivery by heat treatment (normalizing, annealing or high temperature tempering) or no heat treatment, the delivery status should be stated in the contract.