1. Introduce
– Aerospace alloy with Mo, W added to Cr, Ni, Co alloys
– Used in applications involving high temperatures of 815~1093℃ and high stresses
– Common name : MULTIMET, Super alloy 155, Alloy N-155
– UNS R30155
* UNS
- Abbreviation for the Unified Numbering System for Metals and Alloys
- Unified unique numbering system for metals and alloys
- A representative number compatible with metals and alloys defined in several material-related codes, including ASTM, AISI, ASME, AWS, etc.
* R : Reactive and Refractory Metals and Alloys
2. Property
– High strength, heat resistance, ductility, oxidation resistance, good toughness
| Element | Impact |
|---|---|
| Cr | Provides oxidation resistance |
| Ni | Provides toughness |
| Co | Provides high temperature strength, heat resistance |
[N-155 Chemical Composition (%)]
| Cr | Ni | Mo | Co | Fe | W |
|---|---|---|---|---|---|
| 20.0~22.5 | 19.0~21.0 | 2.5~3.5 | 18.5~21.0 | Bal. | 2.0~3.0 |
[N-155 Mechanical Properties]
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) |
|---|---|---|
| 550 | 310 | 18 |
[N-155 Physical Properties]
| Density (g/㎤) | Melting Range (℃) | Specific Heat (0-100℃), J/kg*℃ |
|---|---|---|
| 8.25 | 1343 | 460 |
3. Standard & Specification
– Specification : UNS R30155
| GE | B50A484 |
| DIN | 2.4964 |
| Product Form | AMS |
|---|---|
| Bar, Rod | 5769, 5768, 5794, 5795 |
| Sheet, Plate, Strip | 5532 |
| Wire | 5794 |
4. Available Form
– Bar, Rod
– Sheet, Plate, Strip
– Forings
– Pipe, Tube
– Fittings, Flange
5. Application & Product
– Aerospace, Chemical, Nuclear
| Application | Product |
|---|---|
| Aerospace | Tail cones and tailpipes, Exhaust manifolds, Combustion chambers, Afterburners, Turbine blades, Bolts |
| Chemical | Heat exchangers, Reactors, Valves |
| Nuclear | Reactor elements, Fuel covers, Pressure vessels |
(1) Tail cone and tailpipe / (2) Exhaust manifold / (3) Heat exchanger / (4) Pressure vessel
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