INCOLOY 28

INCOLOY 28 (UNS N08028) 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. Thus, it 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.

Tube.

UNS N08028
ASTM B 668, B 709, B 829
ASME SB-668, SB-709, SB-829
Werkstoff Nr. 1.4563
NACE MR-01-75

Ni ......30.0 – 34.0
Cr.......26.0 – 28.0
Mo..........3.0 – 4.0
Cu..........0.6 – 1.4
Fe............ Balance
Mn........2.50 max.
C........ 0.030 max.
P......... 0.030 max.
S........ 0.030 max.
Si..........1.00 max.

Density, Ib/in³ (g/cm³).................................................0.29 (8.0)
Specific Heat, Btu/lb•°F (J/kg•°C)......................0.105 (450)
Coefficient of Expansion, 10^-6 in/in•°F (μm/m•°C)
75-200°F (21-93°C).........................8.3 (15.0)
75-500°F (21-260°C)......................8.8 (15.9)
75-800°F (21-427°C)......................9.3 (16.8)
Thermal Conductivity^A, Btu • in/ft2•h•°F.............................66
W/m •°C......................................... 11.4
Electrical Resistivity^A, ohm •circ mil/ft (μΩ•m)..... 594 (0.99)
Young's Modulus^A, 10⁶ psi (GPa)............................ 29.0 (200)
^ARoom temperature, as annealed.