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.     

Stock sizes: 4.000” to 8.000” diameter

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.