Haynes HR-120 alloy (UNS N08120) alloy is a solid-solution-strengthened heat-resistant alloy that provides excellent strength at elevated temperature combined with very good resistance to carburizing and sulfidizing environments. Its oxidation resistance is comparable to other widely used Fe-Ni-Cr materials, such as alloys 330 and 800H, but its strength at temperatures up to 2000ºF (1095ºC) is significantly higher, even in comparison to Ni-Cr alloys. Haynes HR-120 alloy can be readily formed hot or cold, and is commonly welded using Hynes 556 filler wire.
Haynes HR-120 Alloy Applications
Applications include those which require high strength combined with good resistance to carburizing and sulfidizing environments such as the following:
• Bar Frame Heat Treating Baskets
• Radiant Tubes
• Wire Mesh Furnace Belts and Basket Liners
• Cast Link Belt Pins
• Muffles, Retorts
• Recuperators
• Heat Treating Fixtures
• Fluidized Bed Components
• Waste Incinerators
Haynes HR-120 Alloy Heat Treatment
Haynes HR-120 alloy is furnished in the solution annealed condition, unless otherwise specified. Depending on the product form, the alloy is solution annealed at a temperature ranging from 2150 to 2250 °F (1175 to 1230 °C) and rapidly cooled.
Nominal Composition
| Weight % |
| Iron | 33 Balance |
| Nickel | 37 |
| Cobalt | 3 max. |
| Chromium | 25 |
| Molybdenum | 1 max. |
| Tungsten | 0.5 max. |
| Niobium* | 0.7 |
| Manganese | 0.7 |
| Silicon | 0.6 |
| Nitrogen | 0.2 |
| Aluminum | 0.1 |
| Carbon | 0.05 |
| Boron | 0.004 |
| Titanium | 0.2 max. |