INCOLOY Alloy 803 (UNS S35045)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Other Designations


INCOLOY alloys are super austenitic stainless steels composed of nickel-iron and chromium. Corrosion resistance of the alloy can be enhanced and extended over a number of environments by adding metals like molybdenum, copper, nitrogen, etc. This alloy exhibits good strength over high temperatures.

INCOLOY alloy 803 is an alloy comprising of iron-nickel and chromium, with a high nickel and chromium content compared to other INCOLOY alloys. This alloy proves to be a cost effective alternative for replacing other alloys that are used in corrosive reducing, oxidizing and sulfidising environments. The alloy also exhibits good stress-rupture strength at high temperatures. Some of the standard forms of the alloy are pipes, welds, tubes, plate, strip, round, squares and forged fittings.

This datasheet will look into the chemical composition, properties and applications of INCOLOY 803.

Chemical Composition

The chemical composition of INCOLOY alloy 803 is given in the following table.

Element Content (%)
Iron, Fe 29.435-42.64
Nickel, Ni 32-37
Chromium, Cr 25-29
Manganese, Mn ≤1.5
Silicon, Si ≤1
Others Remainder

Physical Properties

The following table discusses the physical properties of INCOLOY alloy 803.

Properties Metric Imperial
Density 7.86 gm/cm3 0.284 lb/in3

Mechanical Properties

The mechanical properties of INCOLOY alloy 803 are tabulated below.

Properties Metric Imperial
Tensile strength(sheet, cold rolled and solution annealed) 552-621 MPa 80.1-90.1 ksi
Yield strength(rod, hot finished and solution annealed) 207-255 MPa 30-37 ksi
Elongation at Break( sheet, cold rolled and solution annealed) 40-45% 40-45%
Modulus of Elasticity 195 GPa 28300 ksi
Modulus of Elasticity 188 GPa 27300 ksi
Poissons Ratio 0.32 0.32

Other Designations

Some of the designations used to denote INCOLOY alloy 803 are listed below:-

  • UNS S35045


INCOLOY alloy 803 is used in the following applications:

  • Petrochemical, chemical and thermal processes
  • ID finned pyrolysis
  • Tubing of high-severity ethylene furnaces.

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