Incoloy 803(UNS S35045)
1.Chemical Properties（wt%）
| Ni |
Cr |
Fe |
C |
Al |
Ti |
Cu |
S |
Mn |
Si |
| 32.0-37.0 |
25.0-29.0 |
balance |
0.06-0.10 |
0.15-0.60 |
0.15-0.60 |
≤0.75 |
≤0.015 |
≤1.5 |
≤1.0 |
2.Physical Properties
Density
g/cm3 |
Young’s Modulus at 70°F (20°C),103
(GPa)
|
Shear Modulus at 70°F (20°C), 103 (GPa) |
Poisson’s Ratio at 70°F (20°C) |
Specific Heat
（J/kg*°C） |
Permeability at 200 oersted (15.9 kA/m) |
Melting Range(°C) |
| 7.86 |
195 |
73.8 |
0.32 |
479 |
1.001 |
1365-1400 |
3.Mechanical Properties at room temperature
| Form and Condition |
Tensile strength |
Yield strength |
Elongation |
| MPa |
MPa |
% |
| Tubing, Cold-drawn & Solution Annealed |
586-627 |
275-310 |
45-50 |
| Plate, Hot-rolled & Solution Annealed |
572-607 |
275-296 |
43-47 |
| Sheet, Cold-rolled & Solution Annealed |
552-621 |
275-331 |
40-45 |
| Rod, Hot-finished & Solution Annealed |
572-607 |
207-255 |
45-50 |
4.Characteristics
Incoloy 803 (UNS S35045), an iron-nickelchromium alloy, is designed for use in petrochemical,
chemical and thermal processing applications. The nickel and chromium contents of alloy 803
are higher than those of INCOLOY alloys 800H and 800HT . The ratios of nickel, iron and chromium
are balanced to provide optimum properties in the temperature range of 1550°F (840°C) to 2100°F
(1150°C). Alloy 803 is a cost-effective material which provides an exceptional level of high-temperature
corrosion resistance in oxidation, sulfidation and carburization environments. INCOLOY alloy 803 exhibits
excellent stress-rupture strengths at elevated temperatures.
5.Applications
These characteristics, along with a high resistance to carburization and cyclic oxidation, make INCOLOY
alloy 803 the material of choice for many severe applications including ID-finned pyrolysis tubing in
high-severity ethylene furnaces. INCOLOY alloy 803 is produced in all major product forms in a wide variety
of sizes, finishes and tempers. One unique product form is internally finned, either straight or spiralled
fins, cold finished tubing. Strict process controls ensure complete material traceability and structure
consistency throughout the manufacture of all INCOLOY alloy 803 products.
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