8620 Tubing

Summary

MATERIAL FOR REQUIREMENTS MELT PRACTICE TYPICAL SPECS. CORROSION RESISTANCE TYPICAL TEMP. LIMIT ALT. TO:
8620 Tube Carburizing Bearing Steel Air-melt ASTM A534 AMS 6274 - 250°F (121°C) -

General

Grade 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.

In the carburized condition this alloy is generally used for gears, ring gears, shafts and crankshafts.

Machining is done prior to carburizing to within as close a tolerance as possible. Finish machining or grinding after heat treatment and/or carburizing, should be at a minimum so as not to impair the hardened case of the part.  

Specifications

Our 8620 tubing stock is typically certified for aircraft and bearing quality (AQ/ BQ)
  • ASTM A534
  • AMS 6274
  • AMS 2301

Military Specification MIL-S-8690 has been replaced by AMS 6274.

Chemistry data

Carbon 0.17 - 0.23
Chromium 0.35 - 0.65
Manganese 0.60 - 0.95
Molybdenum 0.15 - 0.25
Nickel 0.35 - 0.75
Phosphorus 0.025 max
Silicon 0.15 - 0.35
Sulphur 0.015 max
Copper 0.30 max
Oxygen 0.0020 max
Aluminum 0.050 max