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Model No: Alloy 28
UNS N08028 / Alloy 28
UNS N08028 / Alloy 28 is a super austenitic stainless steel with very high nickel (31%) and chromium (27%) contents. The molybdenum content is about 3.5%. The alloy is designed for specific purposes, including sulphuric and phosphoric acid applications.
Delivery :
FOB
minimum order :
100 kilograms
Supply Ability :
5000Tonkilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
UNS N08028 / Alloy 28 is a super austenitic stainless steel with very high nickel (31%) and chromium (27%) contents. The molybdenum content is about 3.5%. The alloy is designed for specific purposes, including sulphuric and phosphoric acid applications.
UNS N08028 / Alloy 28 behaves particularly well in sulphuric and phosphoric acid environments, even when contaminated by chlorides and fluorides species. The high nickel content improves its stress corrosion cracking resistance.The combined chromium and molybdenum additions contribute to drastically increase the localized corrosion resistance.
Alloy 28 behaves much better than alloy 825 and could be considered in some applications (sour gas) to replace the more expensive 625 grade. The alloy is extensively used in chemical and offshore applications including very sour gas fields.
In most of the corrosive solutions, alloy 28 is more corrosion resistant than 904L (N08904). The alloy is extensively used in phosphoric acid applications and some sulphuric solutions.
Chemical Composition
| 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
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8 gm/cm3 | 0.289 lb/in3 |
Mechanical Properties
| 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 |
Applications
UNS N08028 / Alloy 28 has been used with success in the following applications :
- Production, concentration and use of phosphoric acid reactors tanks, impellers, piping systems, cyclone evaporators, surface coolers, circulation pumps, agitators, superphosphoric acid storage, shell/tubes for heat exchangers
- Production and use of sulphuric acid: heating equipment, reactor tanks, agitators, inlet pipe in reactors
- Oil and gas production : sour gas application, tubing, separators
- Several offshore platform equipment
- Chemical industry (acetic acid, vinyl chlorides)
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