Incoloy 890 Pipe

INCOLOY® alloy 890 (UNS N08890) is the latest addition to the INCOLOY alloy family of heat-resistant alloys. Alloy 890 joins existing INCOLOY products in offering high strength along with excellent resistance to oxidation, carburization and sulfidation at temperatures up to 2200°F (1200°C). Alloy 890 offers the high chromium content of alloy 803 along with enhanced properties from additions of molybdenum, silicon and niobium. The primary application for alloy 890 is tubes for ethylene pyrolysis furnaces.STANDARD PRODUCT FORMSSmooth bore tubes; Internally finned tubesMAJOR SPECIFICATIONSUNS N08890ASTM B407, 408, 409LIMITING CHEMICAL COMPOSITION, %Ni....... 40.0 - 45.0Cr......23.5 – 28.5Fe............ BalanceMo.......... 1.0 - 2.0Si............ 1.0 - 2.0Nb.......... 0.2 - 1.0Ta......0.10 – 0.60Ti....... 0.15 - 0.60Al.......0.05 – 0.60C........0.06 – 0.14Mn.......... 1.5 max.Cu........0.75 max.P...........0.03 max.S........ 0.015 max.PHYSICAL CONSTANTS AND THERMAL PROPERTIESDensity,Ib/in3.........................................................................0.287g/cm3..........................................................................7.94Coefficient of Expansion, 10-6 in/in•°F(μm/m•°C)70-200°F (21- 100°C)................8.02(14.47)70-600°F (21- 300°C)................8.43(15.11)70-1000°F (21- 600°C)..............8.94(16.40)Thermal Conductivity, Btu • in/ft2•h•°F........................... 550W/m • °C.......................................... 79.3Electrical Resistivity, ohm •circmil/ft.......................... 212.47μΩ•cm..............................................1033Modulus of Elasticity*, 106 psi(GPa).................28.3 (195.1)Shear Modulus*, 106 psi(GPa)............................. 10.7 (73.8)Poisson’sRatio*....................................................................0.322Melting Range, °F (°C)..............2388 – 2522(1309 – 1383)TYPICAL MECHANICAL PROPERTIES