20CrNiMoA directory

   Cross-reference
China: GB / T 3077-1999 (20CrNiMoA)

     20CrNiMoA International Organization for Standardization: ISO 683-11 1987 E (20NiCrMo2 20NiCrMoS2)

  United States: ASTM A29-1993a (8615 8617 8620 8622)

Japan: JIS G4103-1979 (SNCM220)

  Material Name: alloy steel grades: 20CrNiMoA Standard: GB / T 3077-1999
    Chemical composition
Carbon C: 0.17 ~ 0.23

  Si Si: 0.17 ~ 0.37

Manganese Mn: 0.60 ~ 0.95

  Sulfur S: to allow the residual content of ≤ 0.035

  Phosphorus P: allow the residual content ≤ 0.035

  Chromium Cr: 0.40 ~ 0.70

  Ni-Ni: 0.35 ~ 0.75

  Copper Cu: to allow the residual content ≤ 0.030

  Mo Mo: 0.20 ~ 0.30
     Mechanical properties
Tensile strength σb (MPa): ≥ 980 (100)

  Yield strength σs (MPa): ≥ 785 (80)

  Elongation δ5 (%): ≥ 9

Reduction of area ψ (%): ≥ 40

Impact energy Akv (J): ≥ 47

Impact toughness αkv (J/cm2): ≥ 59 (6)

Hardness: ≤ 197HB

Sample size: Sample size is 15mm rough
     Heat treatment
Standard heat treatment: quenching 850 ℃, oil cooling; tempering 200 ℃, air-cooled. Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.