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 |