Nitralloy 135 Modified, as it is commonly known, is a low alloy nitriding steel grade with moderate hardenability. It was designed to provide a high case hardness and maintain its core strength during nitriding. VAC-ARC and VIM-VAR melting procedures tend to yield the most prefered ingot solidification, as well as superior cleanliness.
Aircraft applications, including gears, crankshafts, cams and bolts.
Normalize by heating to 1800 F and hold for 1 to 4 hours, followed by air cooling. Austenitize by heating to 1700-1750 F for 1/2 hour per inch of cross section and quench in oil or water.
Heat evenly to 2000-2025 F. Do not work below 1700F. Forgings should be air cooled.
Heat to 1700 F and slow cool or subcritical anneal at 1250-1300F.
Heat to 1000-1300 F depending on the desired end hardness. Temper material one hour for each inch of thickness
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