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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.
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 |
| Grade | UNS | DIN | EN | AMS | ASTM | JIS |
| Incoloy 803 |
S35045 |
|
ASTM A240 ASTM A213 |
The following table discusses the physical properties of INCOLOY alloy 803.
| Properties | Metric | Imperial |
| Density | 7.86 gm/cm3 | 0.284 lb/in3 |
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 |
| Product Form | Standard |
| Plate, sheet and strip | ASTM A240, A480 |
| Seamless pipe and tube | ASTM A213 |
| Welded tube | ASTM A249 |
| Forgings | ASTM A182 |
INCOLOY alloy 803 is used in the following applications:
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