Nitralloy 135 Alloy Steel
| Chemical Analysis | |
|---|---|
| C | Carbon 0.40 |
| Mn | Manganese 0.60 |
| Si | Silicon 0.30 |
| Cr | Chromium 1.60 |
| Mo | Molybdenum 0.35 |
| Al | Aluminum 1.20 |
General characteristics of Nitralloy 135 Alloy Steel
This is a low alloy nitriding steel with moderate hardenability. It shows high case hardness and maintains its core strength during nitriding. Vacuum arc re-melting provides superior micro-cleanliness.
Applications
Aircraft gears, forged shafts, pinions, crankshafts, cams, camshafts and bolts.
Forging
Heat uniformly to 2000-2025ºF (1090-1105ºC) and do not forge below 1700ºF (925ºC.) Air cool after forging.
Heat treatment
Annealing
Heat to 1700ºF (925ºC) and slow cool or sub-critical anneal at 1250-1300ºF (675-705.)
Normalizing
At 1800ºF (980ºC) for 1-4 hours and air cool.
Hardening
Austenitize at 1700-1750ºF (925-955ºC) for ½ hr per inch of cross section and water or oil quench. Water quench is preferred when cross section exceeds 1 inch in thickness.
Tempering
The tempering temperature is between 1000-1300ºF (540-705ºC) depending upon required properties, and basically 1 hour at temperature per inch of thickness.
Nitriding
The nitriding time, temperature and method will depend upon the final product application. The nitriding temperature is normally 900-1100ºF (480-595ºC.)
Machinability
Machinability is satisfactory in the annealed or normalized conditions.
Weldability
This alloy may be welded by normal fusion methods, with preferable preheat and postheat. Welding will only be carried out prior to surface hardening.