Multimet® N155
Multimet N155 is a solid-solution strengthened superalloy containing relatively high amounts of iron, chromium, nickel, and cobalt, further strengthened by molybdenum, tungsten, and niobium. It is designed to provide high strength at high temperatures combined with excellent oxidation resistance.
- Common Forms: Sheet, Plate, Bar, Wire, Forging Billet.
- Key Feature: High creep/rupture strength up to 1500°F (815°C).
- Oxidation: Good resistance up to 2000°F (1093°C).
- Fabrication: Readily machined and welded (similar to 300 stainless).
N155 is often referred to as a "kitchen sink" alloy because of its complex chemistry. This rich blend of elements allows it to perform in a "multitude" of environments. It bridges the gap between stainless steels and high-nickel superalloys, offering superior high-temperature strength for tailpipes and exhaust manifolds where cyclic heating is common.
High-Temperature Strength
Provides excellent creep and stress-rupture properties, maintaining structural integrity in hot exhaust gas streams.
Oxidation Resistance
Forms a stable oxide scale that resists spalling during repeated heating and cooling cycles, useful for engine afterburners.
Versatile Fabrication
Unlike many gamma-prime strengthened alloys (like Waspaloy), N155 is ductile and can be stamped, formed, and welded with standard techniques.
| Element | Content (%) |
|---|---|
| Iron (Fe) | Balance |
| Chromium (Cr) | 20.0 - 22.5 |
| Nickel (Ni) | 19.0 - 21.0 |
| Cobalt (Co) | 18.5 - 21.0 |
| Molybdenum (Mo) | 2.5 - 3.5 |
| Tungsten (W) | 2.0 - 3.0 |
| Niobium (Nb) | 0.75 - 1.25 |
*Note: Also contains Nitrogen (0.10 - 0.20%) for solid solution strengthening.
| Product Form | Standards (AMS / ASTM) |
|---|---|
| Sheet, Strip, Plate | AMS 5532 |
| Bar, Forgings, Rings | AMS 5769, AMS 5768 |
| Welding Wire | AMS 5794 |
| Tubing | AMS 5585 |
| Property | Typical Values (Room Temp) |
|---|---|
| Tensile Strength | 115 - 135 ksi (790 - 930 MPa) |
| Yield Strength (0.2% Offset) | 55 - 75 ksi (380 - 515 MPa) |
| Elongation | 30 - 50 % |
| Hardness (Rockwell B) | 90 - 98 HRB |
Aircraft Exhausts
Tailpipes, exhaust manifolds, and collector rings on reciprocating and jet engines.
Turbine Rotors
Buckets and blades in land-based gas turbines where temperatures are moderate but stress is high.
Afterburners
Flame holders and combustion liners requiring oxidation resistance.
Industrial Fasteners
High-temperature bolts and fasteners used in furnaces and kilns.
Need Multimet N155?
We supply Multimet N155 (UNS R30155) in sheet, bar, and billet forms. Certified to Aerospace Material Specifications (AMS).
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