Chemical Content ( % ) C P S Mn Si Cr Ni Al Fe Other Max 0. 05 0.02 5 0.0 2 5 0. 20 M ax 0.40 26.5 ~ 27.8 Max 0.60 5.0 ~ 7 .0 Bal. Mo 1.8-2.2 Mechanical Properties Max Continuous Service Temp 1350 ºC Resisivity at 20 ºC 1. 45 ohm mm2/m Density 7. 1 g/cm3 Thermal Conductivity 46.1 KJ/m·h· ºC Coefficient of Thermal Expansion 16.0 ×10-6/ ºC Melting Point 1 5 1 0 ºC Tensile Strength 637~784 Mpa Elongation Min 12% Section Variation Shrink Rate 6 5~ 75 % Repeatedly Bend Frequency