Nitriding® 135M VAR AMS 6471

Nitriding 135M VAR is a chrome moly alloy steel designed for applications which require wear and abrasion resistance.  This is achieved through its high surface hardness and resistance to heat.  Nitriding 135M is commonly suitable for temperatures up to 1000 deg. F.

Common stock sizes: 0.750” to 4.000” diameters.

Common Specifications:

  • AMS 6471
  • AMS 6470
  • AMS-S-6709
  • MIL-S-6709
  • Bell 299-247-036
  • Pratt & Whitney LCS F-17
  • General Electric GE S-400 / S-SPEC-35

Industry Trade Names:

  • Nitriding 135M (Modified)
  • Nitralloy 135M (Modified)

Common Applications:

  • Aircraft gears
  • Bolts, bushing and pinions
  • Crankshafts
Rockwell-Industries-Intl-Nitriding-135M-VAR-image

Composition

Element Min. Max.
Carbon 0.38 0.43
Manganese 0.50 0.80
Silicon 0.20 0.40
Phosphorus -- 0.015
Sulfur -- 0.015
Chromium 1.40 1.80
Nickel -- 0.40
Molybdenum 0.30 0.40
Copper -- 0.35
Aluminum 0.95 1.30

Average Grain Size of ASTM No. 5 or finer

The Jominy Hardenability of each heat shall be:

50 HRC minimum at J 12/16 inch

46 HRC minimum at J 16/16 inch