Alloy

8620

AISI/SAE 8620 a Nickel-Chromium-Molybdenum Case Hardening Alloy Steel
Typical Analysis
C Mn P S Si Ni Cr Mo
.20 .80 .020 .0025 .25 .55 .50 .20
Characteristics
  • The most widely used alloy case-hardening steel, which may be carburized and hardened to produce a hard wear resistant case combined with core strength of the order of 125,000 psi (862 N/mm2). Uniform case depth, hardness and wear properties with minimum distortion are characteristics of this grade. The steel may also be used, not carburized, in a variety of general applications where a '20' carbon alloy is desirable.
Typical Applications
  • Heavy-duty gears, pinions, spline shafts, piston pins, transmission components, rock drilling bit bodies, plastic molds, etc.
Typical Heat Treatment
  • Forging
    • Commence 1200℃ max.
    • Finish 950℃
  • Annealing
    • 840℃ Furnace cool
  • Normalizing
    • 900℃ Air cool
  • Hardened & Tempered (Uncarburized) - Heat to 816℃/ 840℃ and oil quench or Water quench, temper at 200℃/ 650℃ according to properties required.
  • Carburizing - Direct oil quench - Carburize at 900℃/925℃ for eight hours (for .060 case depth). Oil quench. Temper at 150℃/232℃
  • 150℃ - Case hardness approx. RC 63
  • 232℃ - Case hardness approx. RC 58
Availability
  • Grade 8620 is typically available Hot Rolled, As Rolled.
  • Larger diameters are Hot Forged, As Forged.

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