Pyrowear® 53 Bar AMS 6308

Pyrowear® 53 is a double vacuum melted premium alloy steel.  It is a carburizing gear steel and exhibits a strong fatigue resistance, toughness and deep hardenability.     

Common size range: 1.500” to 11.000” diameters.

Common Specifications:

  • AMS 6308
  • PWA-S-6308
  • Sikorsky SS9707
  • Boeing HMS 6-1288
  • Boeing HP 4-1
  • Bell 299-947-334

Common Applications:

  • Jet engine gearboxes
  • Rotorcraft

Average Grain size per ASTM No. 6 or finer per ASTM E112.

Rockwell-Industries-Pyrowear-53-AMS-6308-image

Composition

Element Min. Max.
Carbon 0.07 0.13
Manganese 0.25 0.50
Silicon 0.60 1.20
Phosphorus -- 0.015
Sulfur -- 0.010
Chromium 0.75 1.25
Nickel 1.60 2.40
Molybdenum 3.00 3.50
Copper -- 0.35
Vanadium 0.05 0.15

Macrostructure Limits:

Class Condition Severity
1 Freckles A
2 White Spots A
3 Radial Segregation B
4 Ring Pattern B

Common Melting Practice: VIM-VAR.