Alloy 28
Introduction :
Alloys are composed of nickel-chromium-iron as the primary elements. Additives that are used in this alloy to enhance its strength, corrosion resistance include molybdenum, copper and nitrogen. These alloys are classified as super alloys due to their high strength and ability to function at high temperatures.
Chemical Composition
The chemical composition of Alloy 028 is given in the following table.
| Element | Content (%) |
|---|---|
| Iron, Fe | 29-40.4 |
| Nickel, Ni | 30-34 |
| Chromium, Cr | 26-28 |
| Molybdenum, Mo | 3-4 |
| Manganese, Mn | ≤2.5 |
| Others | Remainder |
Physical Properties
The following table discusses the physical properties of INCOLOY alloy 028.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8 gm/cm3 | 0.289 lb/in3 |
Mechanical Properties
The mechanical properties of INCOLOY alloy 028 are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength(annealed) | 500 MPa | 72.5 ksi |
| Yield strength(annealed) | 214 MPa | 31 ksi |
| Elongation at Break(Cold worked) | 15% | 50% |
| Modulus of Elasticity | 200 GPa | 29000 ksi |
| Hardness, Rockwell B | 80-90 | 80-90 |
| Hardness, Rockwell C | 33 | 33 |
Other Designations
Some of the designations used to denote INCOLOY alloy 028 are listed below:
- UNS N08028
- ASTM B 668
- ASTM B709
- ASTM B829
Applications
Alloy 028 is used in the following applications:
- Chemical and petrochemical processing industry
- Downhole service in deep sour gas wells.