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All Categories > Alloyed Bars and Plates > Aircraft Alloy Steels > Cold Finished Aircraft Alloy Bars > NITRIDING #3 (135 Modified) Aircraft Alloy > NITRIDING #3 (135 Modified) Aircraft Heat Treated and Cold Finished Alloy - Rounds > Size 7/8  
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Size 7/8, NITRIDING #3 (135 Modified) Aircraft Heat Treated and Cold Finished Alloy - Rounds

Nitriding #3 (135 Modified) is a chromium-molybdenum aluminum alloy steel that can be heat treated to develop high core strength and then nitrided to produce extremely high case hardness. This combination of properties is useful when requirements call for high surface hardness for wear and abrasion, for strength and hardness at temperatures up to approximately 1000°F, and for increased fatigue strength and resistance to corrosion.

MIL-S-6709 - AMS 6472 - AMS 2301

Color Marking: Ends painted Blue and Orange

Physical Conditions F
Surface Condition 4

Stock Lengths 12' Approx.

Specifications  · Analysis  · Applications  · Mechanical Properties  · Hardening


Estimated Weight per Foot

2.046 lb

Estimated Weight 12-Ft. Bar

24.56 lb

Carbon .38/.43
Manganese .50/.70
Phosphorus .025 Max.
Sulphur .025 Max.
Si. .20/.40
Cr. 1.40/1.80
Mo. .30/.40
Al. .95/1.30

Used for nitrided parts requiring high surface hardness, resistance to heat, and less distortion than parts fabricated from steel requiring quenching to case harden.

Mechanical Properties
The following properties apply to material in Physical Condition F (hardened and tempered):
Tensile Strength - 112,000 psi Min
Yield Strength - 90,000 psi Min
Elongation in 2" - 16% Min.
Reduction of Area - 50% Min.

End quench hardenability values are Rockwell "C" 50 maximum at 8/16" and Rockwell "C" 45 minimum at 12/16"


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