Designated as UNS N08800 or DIN W.Nr. 1.4876, Incoloy 800 (also known as “Alloy 800”) is an iron-nickel-chromium alloy with good strength and excellent resistance to oxidation and carburization in high-temperature atmospheres. It also has excellent resistance to corrosion by many aqueous environments and resistance to chloride stress-corrosion cracking. Incoloy 800 alloy maintains a stable austenitic structure during prolonged exposure to high temperatures since it doesn’t form the embrittling sigma phase after long time exposure at 1200°F [649°C]. It’s mainly used for petrochemical process piping, heat exchangers, carburizing equipment, heating element sheathing, and nuclear steam generator tubing.

1. Chemical Composition Requirements

The Chemical Composition of Incoloy 800, %
Ni	30.0-35.0
Cr	19.0-23.0
Fe	≥39.5
Ti	0.15-0.60
Al	0.15-0.60
C	≤0.10
Mn	≤1.50
Si	≤1.00
S	≤0.015
Cu	≤0.75

2. Physical Properties of Incoloy 800

Density	Melting Range		Specific Heat		Electrical Resistivity
g/cm3	°C	°F	J/kg. k	Btu/lb.°F	µΩ·m
7.94	1357-1385	2475-2525	460	0.110	989

3. Mechanical Properties of Incoloy 800

Tensile Strength, min.		Yield Strength, min.		Elongation, min.	Hardness, min.
Mpa	ksi	Mpa	ksi	%	HB
600	87	295	43	44	138

4. Product Forms and Standards

Product From	Standard
Rod and Bar	ASTM B408, EN 10095
Plate, Sheet & Strip	ASTM A240, A480, ASTM B409, B906
Seamless Pipe & Tube	ASTM B829, B407
Welded Pipe & Tube	ASTM B514, B515, B751, B775
Welded fittings	ASTM B366
Forging	ASTM B564, DIN 17460

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