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800H/AT
Product Information
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800H/AT is an austenitic heat resistant alloy designed for high temperature structural applications. The strength of 800H/AT is achieved by controlled levels of carbon, aluminum and titanium along with a 2100°F minimum anneal to achieve a grain size of ASTM 5 or coarser.
800H/AT is commonly welded using RA82 (ERNiCr-3) bare wire for applications under 1450°F. RA330-04 (N08334) bare wire offers a closer match of thermal expansion coefficient, and somewhat higher strength. For maximum strength alloy 617 (ERNiCrCoMo-1) bare wire or 117 (ENiCrCoMo-1) covered electrodes are suggested. To avoid possible stress relaxation grain boundary cracking of N08811 in applications above 1000°F the welded fabrication may be heated 1650°F for about one hour per inch of thickness or 30 minutes minimum then air cooled.
Specifications
UNS N08811, UNS N08810
Werkstoff 1.4958, Werkstoff 1.4959
EN 1.4958, EN 1.4959
ASTM B 407, ASTM B 408, ASTM B 409
ASME SB-407, ASME SB-408, ASME SB-409 Code Case 1325
Inventory
800H/AT Plate, 800H/AT Sheet, 800H/AT Coil, 800H/AT Welding Products
Common Trade Names
800H, Incoloy 800, Alloy 800
Chemical Composition, %
| Cr | Ni | Mn | Si | Al | Ti | Al +Ti | C | Cu | P | S | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MIN | 19.0 | 30.0 | - | - | 0.15 | 0.15 | 0.85 | 0.06 | - | - | - | - |
| MAX | 23.0 | 35.0 | 1.5 | 1.0 | 0.6 | 0.6 | 1.2 | 0.1 | 0.75 | 0.045 | 0.015 | 39.5 |
Features
- High design stresses for ASME Section VIII applications to 1650°F
- Useful oxidation resistance through 1900°F
- Resistant to chloride ion stress corrosion cracking
Applications
- Nitric acid catalyst supports
- Reformer outlet pigtails and manifolds
- Heat exchangers
- Pressure vessels
- Dampers
Physical Properties
Density: 0.287 lb/in3
Melting Point: 2475 - 2525°F
| Temperature, °F | 70 | 1400 | 1600 | 1800 |
| Coefficient* of Thermal Expansion, in/in°F x 10-6 | - | 9.9 | 10.2 | - |
| Thermal Conductivity Btu • ft/ft2 • hr • °F |
6.7 | 13.8 | 15.1 | 17.8 |
| Modulus of Elasticity, Dynamic psi x 106 | 28.5 | 21.1 | 19.2 | - |
* 70°F to indicated temperature.
Mechanical Properties
Representative Tensile Properties
| Temperature,°F | 70 | 1000 | 1200 | 1400 | 1600 | 1800 |
| Ultimate Tensile Strength, ksi | 77 | 63.5 | 55.7 | 32.3 | 18.6 | 10.2 |
| 0.2% Yield Strength, ksi | 29 | 16.5 | 14.8 | 14.4 | 11.6 | 8.9 |
| Elongation, % | 52 | 51 | 50 | 78 | 120 | 120 |
Typical Creep- Rupture Properties
| Temperature, °F | 1400 | 1600 | 1800 |
| Minimum Creep 0.0001%/Hour, ksi | 6.0 | 3.6 | 1.05 |
| 10,000 Hour Rupture Strength, ksi | 7.3 | 3.5 | 1.2 |
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