The picture of incoloy 825 nickel alloy products .
825
Incoloy 825 is a nickel-base alloy generally similar to Alloy 20 in aqueous corrosion. It has useful resistance to boiling sulfuric acid up to 40% concentration, to 60% concentration at 176°F and in all concentrations to 150°F. Alloy 825 is stabilized annealed at the mill to resist intergranular corrosion as-welded. If exposed for long time to the sensitive temperature range 1200-1400°F the alloy may exhibit severe intergranular corrosion in certain very aggressive environments.
Chemistry
| Ni | Cr | Mo | Mn | Cu | Si | C | S | Ti | Al | Fe | ||||||||||
MIN | 38.0 | 19.5 | 2.5 | -- | 1.5 | -- | -- | -- | 0.6 | -- | 22.0 | ||||||||||
MAX | 46.0 | 23.5 | 3.5 | 1.0 | 3.0 | 0.05 | 0.05 | 0.03 | 1.2 | 0.2 | -- | ||||||||||
Alloy form
Pipe, plate, sheet, welding products
Common trade names
Alloy 825, Incoloy 825, Inconel 825
Features
- Excellent resistance to sulfuric and phosphoric acids
- Resists intergranular corrosion in the as-welded condition
- Practical immunity to chloride stress corrosion cracking (SCC)
- Resists polythionic acid SCC
Applications
- Valves
- Phosphoric acid production
- Chemical process vessels
- Catalytic cracking units
Physical properties
Hustota: 0.294 lb/inch3 (1 lb/inch3 = 1/27,6 g/m3)
Bod tání: 1 371 - 1 399 °C
Magnetická permeabilita: 21 °C (H = Oersted) 1,005
Temperature, °F | 80 | 100 | 200 | 400 | 600 | 800 | 1000 | 1200 | 1400 | 1600 | 1800 | 2000 |
Coefficient* of thermal expansion, in/in°F x 10-6 | -- | -- | 7.7 | 8.3 | 8.5 | 8.7 | 8.8 | 9.1 | 9.5 | 9.7 | -- | -- |
Thermal conductivity | 6.4 | 6.5 | 7.1 | 8.1 | 9.1 | 10.0 | 10.9 | 11.8 | 12.9 | 14.3 | 16.0 | -- |
Electrical resistivity, | 678 | 680 | 687 | 710 | 728 | 751 | 761 | 762 | 765 | 775 | 782 | 793 |
* 70°F to indicated temperature.
Mechanical Properties
Minimum specified properties, ASME B 168
Ultimate tensile strength, ksi | 85 |
0.2% yield strength, ksi | 35 |
Elongation, % | 30 |
Temperature, °F | 80 | 500 | 1000 | 1200 | 1350 | 1500 | 1600 | 1700 | 1800 |
Ultimate tensile strength, ksi | 100 | -- | 85.9 | -- | -- | -- | -- | -- | -- |
0.2% yield strength, ksi | 43.5 | -- | 32.2 | -- | -- | -- | -- | -- | -- |
Modulus of elasticity dynamic, | 28.3 | 36.4 | 23.8 | 22.7 | 21.7 | 20.3 | 19.4 | 18.3 | 17.3 |
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