Incoloy 800* Specification
*Trade name of Special Metals Group of Companies
- W.NR 1.4875
- UNS N08800
- AWS 020
Applicable Standards:
- BS 3075 NA15
- BS 3076 NA15
This Nickel-Iron-Chromium alloy has good strength and excellent resistance to oxidation and carburisation in high temperature atmospheres. Incoloy 800 also resists corrosion in many aqueous environments.
| Good Mechanical Properties at Elevated Temperatures | No |
| Corrosion Resistant at Ambient Temperatures | Yes |
| Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures | No |
| Oxidation Resistant | Yes |
| Precipitation Hardenable | No |
Applications include:
- Process Piping
- Heat Exchangers
- Carburising Equipment
- Heating Element Sheathing
| Approximate Chemical Composition | |
| Ni | 30 - 35% |
| Fe | 39.5% min |
| Cr | 19 - 23% |
| C | 0.1% max |
| Al | 0.15 - 0.6% |
| Ti | 0.15 - 0.6% |
| Properties | ||
| DENSITY | 7.94 g/cm3 | 0.287 lb/in3 |
| MELTING POINT | 1385 oC | 2525 oF |
| COEFFICIENT OF EXPANSION | 14.4 µm/m °C (20 - 100°C) |
7.9 x 10-6 in/in
°F (70 - 212°F) |
| MODULUS OF RIGIDITY | 78.9 kN/mm2 | 11444 ksi |
| MODULUS OF ELASTICITY | 196.5 kN/mm2 | 28500 ksi |
| CONDITION OF SUPPLY | HEAT TREATMENT (AFTER FORMING) |
| Annealed/Spring Temper | Stress relieve at 450 - 470oC (840 - 880oF) for 30 - 60 minutes and air cool. |
| CONDITION | APPROX TENSILE STRENGTH | APPROX SERVICE TEMPERATURE | ||
| Annealed | 600 - 800 N/mm2 | 87 - 116 ksi | -200 to +815oC | -330 to +1500oF |
| (for lightly stressed applications) | ||||
| Spring Temper | 800 - 1100 N/mm2 | 116 - 159 ksi | -200 to +815oC | -330 to +1500oF |
| (for lightly stressed applications) | ||||
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