Material Composition & Similar Grades
Key elements include:
Nickel (Ni): 30–34% (ensures austenitic structure and corrosion resistance)4.
- Chromium (Cr): 26–28% (boosts oxidation and chloride resistance)45.
- Molybdenum (Mo): 3–4% (prevents pitting and crevice corrosion)34.
- Copper (Cu): ~1% (improves sulfuric acid resistance)35.
Similar Grades:
- UNS N08028 (USA), 1.4563 (DIN/Germany), Sanicro 28 (commercial name)34.
Key Performance Features
Exceptional Corrosion Resistance:
- Resists sulfuric acid (up to 85% concentration), phosphoric acid, and chloride-induced stress corrosion cracking (SCC)23.
- Maintains integrity in seawater, acidic/alkaline media, and high-temperature steam (up to 585°C)23.
High-Temperature Mechanical Stability:
- Tensile strength: ≥800 MPa; Yield strength: ≥300 MPa; Elongation: ≥35%13.
- Retains strength and ductility at 600–650°C, ideal for thermal cycling24.
Fabrication Flexibility:
- Hot working: Forged or rolled at 900–1200°C for shaping14.
- Cold working: Cold rolling/drawing for precision dimensions and enhanced strength13.
- Heat treatment: Solution annealing (1000–1200°C) + rapid cooling to optimize microstructure14.
Production Methods
Alloy28 round bars are manufactured through:
- Vacuum Melting: Ensures low carbon content (≤0.009%) to avoid carbide precipitation45.
- Forming Processes:
- Hot extrusion or rolling to form billets14.
- Cold drawing for tight tolerances and smooth surfaces13.
- Surface Finishing: Grinding or polishing to achieve ASTM/EN-specified surface quality35.
Applications in Critical Industries
Alloy28 round bars excel in:
- Chemical Processing: Reactors, heat exchangers, and sulfuric acid storage tanks23.
- Oil & Gas: Subsea pipelines, valves, and sour gas well components35.
- Marine Engineering: Offshore platforms, desalination systems, and seawater pumps35.
- Power Generation: Nuclear reactor components and flue gas scrubbers34.
- Medical Devices: Implants and surgical tools requiring biocompatibility3.
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Certified suppliers offer Alloy28 round bars in diameters 10–500mm, compliant with ASTM B668, EN 10088-1, and NACE MR0175 standards34.
