Designated as UNS S35045, Incoloy 803 (also known as Alloy 803) is an iron-nickel-chromium alloy with higher nickel and chromium contents. It has exceptional resistance to high-temperature corrosion in oxidation, sulfidation and carburization environments. Alloy 803 also exhibits excellent stress-rupture strengths at elevated temperatures. Incoloy 803 is used primarily for petrochemical, chemical and thermal processing applications, as well as ethylene furnaces piping.

1. Chemical Composition Requirements

The Chemical Composition of Incoloy 803, %
Nickel	32.0-37.0
Chromium	25.0-29.0
Iron	Balance
Carbon	0.06-0.10
Aluminum	0.15-0.60
Titanium	0.15-0.60
Copper	≤0.75
Sulfur	≤0.015
Manganese	≤1.50
Silicon	≤1.00

2. Mechanical Properties of Incoloy 803

Tensile Strength		Yield Strength		Elongation
Mpa	ksi	Mpa	ksi	%
572-607	83-88	275-296	40-43	43-47

3. Physical Properties of Incoloy 803

Density		Melting Range		Specific Heat		Permeaklity
lb/in3	g/cm3	°F	°C	Btu/lb.°F	J/kg. °C	@200 oersted
0.285	7.86	2490-2555	1365-1400	0.114	479	1.001

4. Product Forms and Standards

Product Form	Standard
Plate, sheet and strip	ASTM A240, A480
Seamless pipe and tube	ASTM A213
Welded tube	ASTM A249
Forgings	ASTM A182

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