PT GLOBALINDO ANUGERAH JAYA ABADI

Alloy Steel

SNCM 439 / AISI 4340 / VCN 150

AISI 4340 alloy steel is a heat treatable and low alloy steel containing chromium, nickel and molybdenum. It has high toughness and strength in the heat treated condition.

  • Composition(%)

    C 0.36-0.43
    Si 0.15-0.35
    Mn 0.60-0.90
    P/S 1.60-2.00
    Cr 0.60-1.00
    Mo 0.15-0.30
  • Heat Treatment(°C)

    Normalizing 820-870 (Air cooling)
    Annealing 820 (Furnace cooling)
    Hardening 820-870 (Oil quenching)
    Tempering 580-680 (Rapid cooling
  • Hardness

    Annealed 255 HB MAX
    Tempered 31-38 HRC

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