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8620 Alloy Steel Round Bar

C Mn P S Si Ni Cr Mo
0.20 1.70 0.020-0.025 0.010-0.015 0.80 2.0 1.50 0.70


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.



  • 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.



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




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


Soft Annealing °C Cooling Hardness HB
820-850 Furnace max. 290


Stress-relief Annealing °C Cooling
600-650 Furnace


1st Pre-Heating °C up to approx. 400 in an air-circulating furnace
2nd and 3rd 780 and 850
Hardening °C 840-870
Quenching 810 °C Oil ,Quench
Tempering °C at least twice 150-200
Hardness after Temperature HRC 62 – 64