Technical parameters of Fe-Cr-Al high-temperature wire Table： Material/performance OCr21AL6Nb OCr27ALMo2 Main Chemical Composition Cr 21.0-23.0 26.5-27.8 Al 5.0-7.0 6.0-7.0 Re opportune opportune Fe Rest Rest Nb0.5 Mo1.8-2.2 Max.continuous service temp.of element (ºC) 1350 1400 Resistivity at 20ºC (μΩ·m) 1.45 1.53 Density(g/cm3) 7.10 7.10 Thermal conductivity (KJ/m·h·ºC) 46.1 45.2 Coefficient of lines expansion (α×10-6/ºC) 16.0 16.0 Melting point ( ºC) 1510 1520 Tensile strength 650-800 680-830 Elongation at rupture (%) >12 >10 Variation of area (%) 65-75 65-75 Repeat bending Frequency (F/R) >5 >5 Hardness(H.B.) 200-260 200-260 Micrographic structure Ferrite Ferrite Magnetic properties Magnetic Magnetic