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Incoloy 800HT is a fully austenitic low carbon nickel-iron-chromium alloy from the same family as Incoloy 800. It is composed primarily of nickel and iron, with some chromium, aluminum, and titanium.
800HT alloy has excellent creep strength above 1290°F. Alloy 800ht has similar high temperature properties to 800H alloy. Incoloy 800HT is resistant to a wide range of corrosive media. Its high nickel content makes it resistant to stress corrosion cracking in aqueous corrosive conditions. The high chromium content gives it better resistance to pitting and crevice corrosion cracking.
800HT has good corrosion resistance to nitric acid and organic acids, but limited corrosion resistance in sulfuric and hydrochloric acids. It has good corrosion resistance in both oxidizing and non-oxidizing salts, but pitting may be present in halides. It also has good corrosion resistance in water, steam, and mixtures of steam, air, and carbon dioxide.
Composition | Value |
Ni | 30.0-35.0 |
Cr | 19.0-23.0 |
Fe | ≥39.5 |
Al | 0.25-0.60 |
C | 0.06-0.10 |
Mn | ≤1.5 |
P | ≤0.04 |
Si | ≤1 |
S | ≤0.015 |
Al&Ti | ≤0.5-1.20 |
Cu | ≤0.75 |
Physical Properties | Value |
Density | 8.02 g/cm³ |
Specific heat | 460 J/Kg*K |
Intrinsic resistance | 99 μΩ·cm |
Thermal conductivity | 12.6 W/m*K |
Longitudinal elastic modulus | 19.7x104 MPa |
Curie point | -115 °C |
Magnetic properties | NO |
Melting point | 1357-1395 |
Physical Properties at High Temperatures
Temperatures | Thermal Conductivity (W/m*K) | Average Expansion Coefficient (10-6/℃) | Longitudinal Elastic Modulus (104 MPa) |
Normal Temperature | 12.6 | - | 19.7 |
100 °C | 14.1 | 14.6 | 19.3 |
200 °C | 16.1 | 15.9 | 18.7 |
300 °C | 17.8 | 16.4 | 18.0 |
400 °C | 19.3 | 16.8 | 17.3 |
500 °C | 20.6 | 17.0 | 16.7 |
600 °CC | 23.2 | 17.3 | 15.9 |
700 °C | 24.4 | 17.7 | 15.2 |
800 °C | 25.1 | 18.1 | 14.5 |
900 °C | 25.9 | 18.3 | 13.8 |
1000 °C | 26.7 | 18.6 | 13.1 |
Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) |
65[450] | 25[170] | 30 |
High temperature resistance
Incoloy 800HT alloy has excellent high temperature resistance. It can maintain stability at high temperatures and is not easy to soften or flow. This ability makes it suitable for applications in various high temperature environments, such as furnace tubes, heating elements, annealing furnaces, heat treatment equipment and petrochemical units.
Corrosion resistance
Incoloy 800HT alloy has good corrosion resistance and can resist corrosion from a variety of corrosive media. It has good resistance to acidic solutions, alkaline solutions and chlorides. In addition, it can also maintain good corrosion resistance in oxidizing environments.
Based on these characteristics, 800HT alloy is widely used in chemical, petrochemical, oil refining, power and nuclear energy industries. It is used to manufacture reactors, pipelines, heat exchangers, storage tanks, pipelines and pickling equipment.
Anti-oxidation performance
Incoloy 800HT alloy has excellent anti-oxidation properties and can remain stable in high temperature and oxidizing environments. It can form a dense oxide film to effectively prevent the material from being oxidized. Therefore, it can be used to manufacture high temperature furnaces, burners and other high temperature equipment.
Crack and stress corrosion resistance
Incoloy 800HT alloy has good crack and stress corrosion resistance. It can remain stable in high temperature and corrosive environments and is not prone to cracks and stress corrosion cracking. This makes Incoloy 800HT alloy an important material in the oil refining, chemical and nuclear energy industries.
Manufacturing and processing
Incoloy 800HT alloy can be manufactured by conventional processes such as smelting, forging, heat treatment and cold working. During the manufacturing process, the composition and processing temperature of the alloy need to be strictly controlled to ensure the best performance and microstructure.
Processing processes include forging, hot rolling, cold drawing, welding, etc. During the welding process, appropriate welding materials and welding processes should be selected to avoid welding defects and stress corrosion cracking.
STANDARD | WERKSTOFF.NR. | UNS | JIS | BS | GOST | EN | OR |
Incoloy 800HT | 1.4959 / 1.4876 | N08811 | NCF 800HT | NA 15(HT) | ЭИ670 | X8NiCrAlTi32-21 | XH32T |
Product | Standard | Show |
Incoloy 800ht rod bars | ASTM B408, EN 10095 |  |
Incoloy 800ht plate/sheet/strip | ASTM A240, A480, ASTM B409, B906 |  |
Incoloy 800ht pipe tubes | ASTM B407 |  |
Incoloy 800ht fittings | ASTM B366 |  |
Incoloy 800ht forgings | ASTM B564, DIN 17460 |  |
Ethylene furnace quench boilers
Hydrocarbon cracking
Industrial furnaces
Heat-treating equipment
Chemical and petrochemical processing
Super-heater and re-heaters in power plants
Pressure vessels
Heat exchangers
