Incoloy 28 is a highly corrosion-resistant austenitic alloy offering resistance to a variety of media. The alloy resists attack in reducing media due to its contents of nickel, copper, and molybdenum and is resistant to oxidizing species due to its high level of chromium. Alloy 28 offers resistance to general, localized, and stress-induced corrosion by chlorides and hydrogen sulfides.
Applications of Incoloy 28:
Nickel alloy Incoloy 28 is widely used in oilfield applications. Tubes are cold-worked to high levels of strength for downhole service in deep sour gas wells. With its excellent combination of strength and corrosion resistance, alloy 28 also finds applications in the process industries. It is especially useful for handling phosphoric acid. Due to its resistance to chlorides, alloy 28 tubes may be used in the marine industry for seawater-cooled heat exchangers.
Normal product forms: Pipes, tubes.
Specifications/Standard: ASTM B 668, B 709, B 829, ASME SB-668, SB-709, SB-829
Nickel (Ni): 30.0-34.0%
Chromium (Cr): 26.0-28.0%
Iron (Fe): Balance
Carbon (C): 0.03% max
Silicon (Si): 1% max
Manganese (Mn): 2.50% max
Phosphorus (P): 0.03% max
Sulfur (S): 0.03% max
Molybdenum (Mo): 3.00-4.00%
Nitrogen (N): 0.11% max
Copper (Cu): 0.60-1.40%
Physical Constants and Thermal Properties
Density: 8.0g/cm³
Specific Heat Capacity: 450 J/kg-K
Thermal Conductivity: 11.4 W/m·℃
Mechanical Property:
Tensile Strength: Ultimate (UTS) 570 MPa
Yield Strength (Proof): 240 MPa
Elongation at Break: 45%
Brinell Hardness: 180
