What is Alloy 28 (UNS N08028)?
Alloy 28 (UNS N08028) is a high-alloy austenitic stainless steel designed for use in highly corrosive environments, including strong acids, chemical processing, and oil & gas applications. Known for its excellent corrosion resistance, stress corrosion cracking resistance, and weldability, Alloy 28 is a versatile material for industrial applications.
Key Properties of Alloy 28
- Exceptional corrosion resistance in strong acids.
- High resistance to stress corrosion cracking (SCC) and intergranular corrosion.
- Excellent resistance to pitting and crevice corrosion.
- Good weldability and fabricability for industrial applications.
- Available in multiple forms: seamless tube, welded tube, bars, plates, sheets, forgings, and cast products.
Forms of Supply
- Seamless tube and pipe – solution annealed, white-pickled, or bright-annealed finishes, up to 260 mm OD.
- Cold-worked seamless tube and pipe for oil & gas production (Alloy 28-110, Alloy 28-125).
- Welded tube and pipe.
- Welding wire and covered electrodes.
- Strip, annealed or cold-rolled to various hardnesses.
- Wire, drawn or ground.
- Bar, plate, sheet, forged, and cast products.
- Fittings – ASTM A403 and other standards.
Industry Standards & Approvals
- UNS: N08028
- ISO: 4563-080-28-I
- EN Number: 1.4563 | EN Name: X1 NiCrMoCu 31-27-4 | W.Nr.: 1.4563
- DIN: X1 NiCrMoCuN 31 27 4 | SS 2584 | AFNOR Z1NCDU31-27-03
- Seamless tube & pipe: ASTM B668, EN 10216-5, SEW 400, NFA 49-217
- Plate, sheet & strip: ASTM B709, EN 10088-2
- Bar steel: EN 10088-3 | Fittings: ASTM A403
- Approvals: ASME Boiler & Pressure Vessel Code, NACE MR0103, NACE MR0175/ISO 15156, VdTÜV Werkstoffblatt 483
Applications of Alloy 28
Alloy 28 is widely used in chemical, petrochemical, and oil & gas industries, as well as in highly corrosive process environments:
- Seawater and desalination equipment.
- Heat exchangers and chemical reactors.
- Piping and tubing in strong acid and chloride environments.
- Production tubing and casing in oil & gas wells.
- Industrial fittings, bars, plates, sheets, and forged components.
Conclusion
Alloy 28 is a high-performance austenitic stainless steel offering excellent corrosion resistance, weldability, and versatility. Its compliance with multiple international standards and suitability for harsh chemical and oil & gas applications makes it an ideal choice for engineers and industrial buyers seeking reliability and longevity.
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