Incoloy 800HT is designed for demanding high-temperature service, providing a powerful solution when ordinary stainless steel tubings and stainless steel pipe fittings degrade rapidly when exposed to high heat.
What is Incoloy 800HT? High Carbon Power!
Incoloy 800HT (UNS N08811, W.Nr. 1.4959) is a nickel-iron-chromium alloy that is an improved version of Incoloy 800H. The letter after stainless steel grades “HT” denotes a tighter control of carbon, aluminum, and titanium.This controlled chemistry provides excellent creep fracture strength. It performs better at temperatures above 600°C and maintains a stable austenitic structure.
Incoloy 800HT Key Benefits
Controlled levels of carbon, aluminum and titanium increase creep strength. This prevents slow permanent creep deformation over time.
Incoloy 800HT works reliably at extreme temperatures and does not soften easily at high temperatures. This feature can be used in pressure-containing parts.
The high chromium content creates a stable oxide layer that prevents degradation in oxidizing environments.
It prevents carbon absorption in high temperature carbon-rich environments to prevent embrittlement. Suitable for use in furnace applications.
Main Chemical Composition of Incoloy 800HT
| Element | Ni | Cr | Fe | C | Al+Ti | Mn | Si |
|---|---|---|---|---|---|---|---|
| Weight (%) | 30.0 – 35.0 | 19.0 – 23.0 | Balance | 0.06 – 0.10 | 0.85 – 1.20 | ≤1.50 | ≤1.00 |
Mechanical Properties of Incoloy 800HT
| Property | Tensile Strength | Yield Strength | Elongation | Hardness | Density | Melting Range |
|---|---|---|---|---|---|---|
| Value (Typical) | ≥550 MPa (80 ksi) | ≥240 MPa (35 ksi) | ≥30 | ≤190 | 7.94g/cm³ | 1357−1430℃ |
What Are The Uses of Incoloy 800HT ?
- Furnace Components: radiant tubes, mufflers and retort equipment.
- Petrochemical Industry: cracking coils, heat exchangers and pyrolysis tubes.
- Power Generation Industry: superheater and reheater tubes for power plants.
- Industrial Heaters: Various heating elements and tubes for use in high temperature furnaces.
- Chemical Processing: Pipes and fittings for handling high temperature corrosive chemicals.
Products Made From Incoloy 800H
- Seamless steel pipes: Used for high pressure, high temperature fluid transportation.
- Welded pipes: For larger diameters or more cost-effective occasions.
- Fittings: Including elbows, tees, reducers and caps.
- Flanges: Create robust, high-temperature connections.
- Sheet, Plate & Bar: For pipe jacking, structural components and other specialty parts.
Sourcing Incoloy 800HT Pipe and Fittings
A complete Material Test Report (MTR) is required. Verify compliance with ASTM B407 (pipe) or ASTM B564 (forgings).
Work with specialized suppliers of stainless steel pipe and fittings. They understand these alloy steels and can ensure proper fabrication and quality control,and are ISO 9001 and CE-PED certified.
Incoloy 800HT can be welded, but specific procedures are important. Make sure your supplier uses qualified methods.
Ensure that piping and fittings conform to specified dimensions. Including ASME B36.10 (piping) or B16.9 (fittings).
You May Also Want To Read:
Differences between Alloy 800, 800H and 800HT
Mastering Incoloy 800 for Demanding Applications
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