UNS N08926
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UNS N08926 is a super-austenitic molybdenum stainless steel that exhibits excellent resistance to a variety of highly corrosive environments. The combination of molybdenum and nitrogen in its composition resists pitting and crevice corrosion, while copper improves sulfuric acid resistance, and nitrogen improves yield and tensile strengths.
Incoloy alloy 926 is a super-austenitic stainless steel containing 6% molybdenum and enhanced by an addition of nitrogen. The nickel and chromium contents of this alloy make it resistant to a wide range of corrosive environments. The alloy is especially resistant to non-oxidizing acids such as sulfuric and phosphoric. The high molybdenum content and nitrogen provide resistance to pitting and crevice corrosion, while copper enhances resistance to sulfuric acid.
Chemical Composition
The following table shows the chemical composition of alloy 926.
| Element | Content (%) |
|---|---|
| Iron, Fe | 41.69 - 50.35 |
| Nickel, Ni | 24-26 |
| Chromium, Cr | 19-21 |
| Molybdenum, Mo | 6-7 |
| Manganese, Mn | ≤2 |
| Copper, Cu | 0.5-1.5 |
| Silicon, Si | ≤0.5 |
| Nitrogen, N | 0.15-0.25 |
| Phosphorous, P | ≤0.03 |
| Carbon, C | ≤0.02 |
| Sulfur, S | ≤0.01 |
Physical Properties
The physical properties of alloy 926 are outlined in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.03 g/cm³ | 0.29 lb/in³ |
Mechanical Properties
The mechanical properties of alloy 926 are outlined in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | ≥648 MPa | ≥94000 psi |
| Yield strength | ≥296 MPa | ≥43000 psi |
| Modulus of elasticity | 192 GPa | 27800 ksi |
| Elongation at break | ≥35 % | ≥35 % |
| Rockwell B hardness | ≤86 | ≤86 |
Features Of UNS N08926
The Incoloy 926 (UNS N08926) was developed on basis of 904L steel. However, the molybdenum content at 926 steel was raised to 6.5%. The 926 steel has excellent general corrosion resistance and improved resistance to pitting and crevice corrosion. The resistance to stress corrosion cracking is also increased. It is often referred as super austenitic stainless steel.
Applications
The following are some of the major applications of alloy 926:
- Desalinization systems
- Pulp and paper industry
- Food processing equipment
- Chemical processing plant
- Offshore oil and gas production
- Power generation
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