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.
Stock sizes: 0.750” to 4.000” diameter
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)
- Nitralloy 135
Common Applications:
- Aircraft gears
- Bolts, bushing and pinions
- Crankshafts
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
