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INCOLOY 800 is a form of INCOLOY alloy developed by Specialty Metals. Combining nickel, chromium, and iron with trace amounts of other metals, it is renowned for its strength, durability, and resistance to oxidation, carburization, and sulfidation corrosion.
Incoloy 800 alloy typically contains 15-25% chromium, 30-45% nickel, and small amounts of aluminum and titanium. After rapid cooling from high temperatures, 800 alloy remains in the austenitic monophase region, resulting in a single austenitic structure in service. The alloy's high chromium content and sufficient nickel content provide excellent high-temperature corrosion resistance, leading to widespread industrial applications.
INCOLOY 800 alloy resists corrosion in the harshest environments. It all comes down to its composition. INCOLOY 800 alloy's high nickel content provides good sulfidation resistance, iron reduces the risk of internal oxidation, and chromium provides excellent resistance to oxidation and general corrosion. Its key chemical balance results in excellent performance against a wide range of corrosion types. This includes scaling and stress corrosion cracking, particularly chloride stress corrosion due to the formation of metal chlorides.
1. Excellent corrosion resistance in extremely high temperature aqueous media up to 500°C
2. Good resistance to stress corrosion
3. Good workability
Metallographic structure of Incoloy 800H:
800H is a face-centered cubic lattice structure. Very low carbon content and increased Ti:C ratio increase structural stability and maximum resistance to sensitization and intergranular corrosion. A low-temperature annealing around 950°C ensures a fine-grained structure.
Corrosion resistance of Incoloy 800H:
800H can resist corrosion of many corrosive media. Its high nickel content makes it resistant to stress corrosion cracking in aqueous corrosion conditions. The high chromium content provides better resistance to pitting and crevice corrosion cracking. The alloy has good corrosion resistance to nitric acid and organic acids, but limited corrosion resistance in sulfuric acid and hydrochloric acid. Good corrosion resistance in oxidizing and non-oxidizing salts, in addition to the potential for pitting corrosion in halides. It also has good corrosion resistance in water, steam and mixtures of steam, air and carbon dioxide.
Grade | Ni | Cr | Fe≤ | Al | C | Mn | P≤ | Si≤ | S≤ | Al & Ti | Cu≤ |
Incoloy 800H | 30.0-35.0 | 19.0-23.0 | 39.5 | 0.15-0.60 | 0.05-0.10 | 1.5 | 0.045 | 1.00 | 0.015 | 0.30-1.20 | 0.75 |
Density:
7.95 g/cm³ (0.287 lb/in³)
Melting Range:
1350°C - 1400°C (2460°F - 2550°F)
Specific Heat Capacity (cₚ):
480 J/kg·K (0.115 Btu/lb·°F)
Thermal Conductivity (k):
11.8 W/m·K (6.8 Btu·in/h·ft²·°F)
Mean Coefficient of Thermal Expansion (α):
20 - 100°C: 14.4 µm/m·°C (8.0 µin/in·°F)
20 - 500°C: 15.7 µm/m·°C (8.7 µin/in·°F)
20 - 1000°C: 17.0 µm/m·°C (9.4 µin/in·°F)
Electrical Resistivity (ρ):
1.01 µΩ·m (101 µΩ·cm / 61 µΩ·in)
Modulus of Elasticity (Tension, E):
195 GPa (28.3 x 10⁶ psi)
Magnetic Permeability (µᵣ):
Typically < 1.01 (Essentially non-magnetic / paramagnetic in annealed state at 15.9 kA/m). May become slightly magnetic with severe cold work.
| Property | Temperature °C (°F) | Value (Metric) | Value (Imperial) |
|---|---|---|---|
| Specific Heat (cₚ) | 100°C (212°F) | 520 J/kg·K | 0.124 Btu/lb·°F |
| 500°C (932°F) | 690 J/kg·K | 0.165 Btu/lb·°F | |
| 1000°C (1832°F) | 760 J/kg·K | 0.182 Btu/lb·°F | |
| Thermal Conductivity (k) | 100°C (212°F) | 15.3 W/m·K | 8.8 Btu·in/h·ft²·°F |
| 500°C (932°F) | 21.5 W/m·K | 12.4 Btu·in/h·ft²·°F | |
| 1000°C (1832°F) | 30.5 W/m·K | 17.6 Btu·in/h·ft²·°F | |
| Mean Coeff. Thermal Exp. (α) | 20-200°C (68-392°F) | 14.8 µm/m·°C | 8.2 µin/in·°F |
| 20-400°C (68-752°F) | 15.4 µm/m·°C | 8.6 µin/in·°F | |
| 20-600°C (68-1112°F) | 16.0 µm/m·°C | 8.9 µin/in·°F | |
| 20-800°C (68-1472°F) | 16.6 µm/m·°C | 9.2 µin/in·°F | |
| 20-1000°C (68-1832°F) | 17.0 µm/m·°C | 9.4 µin/in·°F | |
| Electrical Resistivity (ρ) | 100°C (212°F) | 1.06 µΩ·m | 63.5 µΩ·in |
| 500°C (932°F) | 1.11 µΩ·m | 66.4 µΩ·in | |
| 1000°C (1832°F) | 1.20 µΩ·m | 72.2 µΩ·in | |
| Modulus of Elasticity (E) | 100°C (212°F) | 189 GPa | 27.4 x 10⁶ psi |
| 500°C (932°F) | 168 GPa | 24.4 x 10⁶ psi | |
| 800°C (1472°F) | 142 GPa | 20.6 x 10⁶ psi | |
| 1000°C (1832°F) | 110 GPa | 16.0 x 10⁶ psi |
Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) |
65[450] | 25[170] | 30 |
WERKSTOFFNR. | UNS | JIS | BS | GOST | AFNOR | EN | OR |
1.4958 / 1.4876 | N08810 | NCF 800H | NA 15(H) | ЭИ670 | Z8NC33-21 | X5NiCrAlTi31-20 | XH32T |
| Product | Standards | Show |
| Incoloy 800H Rods/Bars | ASTM B408, EN 10095 |  |
| Incoloy 800H Sheet/Plate | ASTM A240/ A480/B409/ B906 |  |
| Incoloy 800H Seamless Pipe/Tube | ASTM B829/ B407 |  |
| Incoloy 800H Welded Pipe/Tube | ASTM B829/ B407 |  |
| Incoloy 800H Welded Fittings | ASTM B366 |  |
| Incoloy 800H Forgings | ASTM B564/DIN 17460 |  |
Chemical and Petrochemical Processing—process equipment for theproduction of ethylene, ethylene dichloride, acetic anhydride, ketene,nitric acid and oxy-alcohol
Petroleum Refining—steam/hydrocarbon reformers andhydrodealkylation units
Power Generation—steam super-heaters and high temperature heatexchangers in gas-cooled nuclear reactors, heat exchangers andpiping systems in coal-fired power plants
Thermal Processing Fixtures—radiant tubes, muffles, retorts andfixtures for heat-treating furnaces
