- Grade / Alloy
- Alloy 800
- EN / W.Nr.
- 1.4876
- AISI / SAE
- —
- UNS
- N08800
- Family
- Nickel-iron
Chemical composition
Chemical composition
Typical compositionTypical composition of the principal alloying elements; not a complete acceptance analysis.
| Element | Content (% by mass) |
|---|---|
| NiNickel | 30.5 |
| CrChromium | 20.5 |
| FeIron | Balance |
| Al+TiAluminium + titanium | ≤ 0.7 |
Values describe the grade, not the analysis of a specific batch. The applicable product specification and material certificate determine acceptance. A dash does not mean zero.
The main properties of Alloy 800
Alloy 800 serves equipment exposed to temperature and gases together. Chromium helps form a protective oxide layer and nickel supports its austenitic structure. Its composition therefore addresses hot process conditions as well as ordinary atmospheric corrosion.
Heat exchangers and heaters
Heat-exchanger tubes transfer heat between fluids, while electric-heater sheaths separate an element from its surroundings. Alloy 800 serves both roles, together with petrochemical equipment and furnace components requiring surface resistance, ductility and hot strength.
How it differs from 800H and 800HT
800H and 800HT have more specific composition and structural requirements for sustained loading at high temperatures. Basic Alloy 800 is N08800. A shared family name does not give all three the same mechanical properties: a continuously loaded hot component and a heater sheath represent different duties within this family.
Heat resistance and chemical resistance
Oxidation resistance in hot gas and corrosion resistance in an acid solution describe different properties. Alloy 800 is principally associated with heaters and hot process equipment, rather than the specialised acid resistance of nickel–molybdenum grades.
Typical application areas
Heat exchangers, heater sheaths, process tubing and furnace equipment.
Product and cutting options
Relevant product forms for this material are listed below. Availability varies with grade and dimensions.