ALLOY STEEL

8620/AISI 4140/21NiCrMo2

8620 Steel is a hardenable chromium, molybdenum, nickel low alloy steel more often used for carbonizing to advance a case-hardened phase. This case-hardening will influence in just right wear traits. This Grade is in most cases used for gears, ring gears, shafts and crankshafts.

Steel Properties

8620 is a hardenable chromium, molybdenum, nickel low alloy steel often used for carburizing to develop a case hardened part. This case-hardening will result in good wear characteristics.

Physical Properties
Thermal Conductivity at °C 20 350 700
W/(m*K) 46.0 46.2 46.4
Application

Application- Gears, shafts and other applications where a hard carborized case and a tough core are desired.

Heat Treatment
Soft annealing °C Cooling Hardness HB
820-850 Furnace max. 290
Stress-relief annealing °C Cooling
630-650 Furnace
1st pre-heating °C 2nd and 3rd Hardening °C Quenching Tempering °C Hardness after Teperature HRC
up to approx. 400 in an air-circulating furnace 780 and 850 840-870 810 °C Oil ,Quench at least twice 150-200 62 – 64
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