Incoloy 800HT* * Trade name of Special Metals Group of Companies
W.NR 1.4958
W.NR 1.4959
UNS N08811
AWS 021
W.NR 1.4959
UNS N08811
AWS 021
This Nickel-Chromium-Iron alloy has the same basic
composition as
Incoloy 800, but has significantly higher creep rupture strength,
resultant from the close control of the carbon, aluminium and titanium
contents. It has good strength and excellent resistance to oxidation and
carburisation in high temperature atmospheres. It also resists corrosion in many aqueous environments.
Incoloy 800, but has significantly higher creep rupture strength,
resultant from the close control of the carbon, aluminium and titanium
contents. It has good strength and excellent resistance to oxidation and
carburisation in high temperature atmospheres. It also resists corrosion in many aqueous environments.
Applications include:
- Chemical Processing
Petrochemical Processing - Industrial Furnaces
- Heat Treating Equipment
| Approximate Chemical Composition | |
| Ni | 30-35% |
| Fe | 39.5% min |
| Cr | 19-23% |
| C | 0.06 - 0.1% max |
| Al | 0.15 - 0.6% |
| Ti | 0.15 - 0.6% |
| Al + Ti | 0.85 - 1.2% |
| 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/m2 | 11444 ksi |
| MODULUS OF ELASTICITY | 196.5 kN/m2 | 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 | -200o to +1100oC | -330o to +2010oF | ||
| (for lightly stressed applications) | ||||||
| Spring Temper | 800-1100 N/mm2 | 116-159 ksi | -200o to +1100oC | -330o to +2010oF | ||
| (for lightly stressed applications) | ||||||
| STANDARDS |
| BS 3076 NA 15H |
