Nitralloy 135® Bar, Nitriding Steel AMS 6470, 6472, 2301
Nitralloy135® Bar B5EIA is a Chrome-Moly alloy steel with additions of aluminum typically used for nitrided parts requiring high surface hardness and heat resistance. Parts fabricated from Nitralloy 135® bar typically show less distortion in heat treating than similar parts fabricated from alloys requiring quenching and tempering to achieve similar surface hardness. This alloy may be heat treated in dissociated ammonia gas.
Nitralloy 135® Inventory Size Ranges
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Standard Inventory Specifications
- AMS 6470
- AMS 6472
- ASTM A 370
- ASTM A 29
- AMS 2301
- ASTM A 355
- GE B5E1A S-22
- EN 10204
- Siemens Westinghouse PD-Spec 10305 HD SWPC AB
Common Trade Names
- Nitralloy®
- Nitrided steel®
Common Applications of Nitralloy 135®
- Crankshafts
- Bolts
- Aircraft gears
- Pinions
Chemical Composition
| Element | Percent by Weight | ||
|---|---|---|---|
| C | Carbon | 0.38 - 0.43% | |
| Mo | Molybdenum | 0.30 - 0.40% | |
| Mn | Manganese | 0.50 - 0.80% | |
| Al | Aluminum | 0.95 - 1.30% | |
| Si | Silicon | 0.20 - 0.40% | |
| Ni | Nickel | 0.25% max | |
| Cr | Chromium | 1.40 - 1.80% | |
| Cu | Copper | 0.35% max | |
| S | Sulfur | 0.025% max | |
| P | Phosphorous | 0.025% max |
Physical Properties of Nitralloy 135®
| Density | 0.297 lbs/cubic in, 8.22 g/cubic cm |
Mechanical Properties of Nitralloy 135®
| Tensile Strength | 112 ksi min |
| Yield Strength | at 0.2% offset 90 ksi min |
| Elong in 4D | 16% min |
| Reduction of Area | 50% min |
| Bars | typically provided in the quenched and tempered condition |
| Hardness |
Up to 3.125" dia inclusive BHN 241/285 Over 3.125" to 6.000" inclusive BHN 229/285 |
Nitralloy 135® is a Registered Trademark of Latrobe Specialty Steel Co.
*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.