SEW 400 ( X 4 CrNIMo 165 ) M.no.1.4418 EN 10088 ( X4CrNIMol6 -5 -l ) W.nr.1.4418 Applications : S165M 15 a martensitic / ferritic stainless steel with excellent mechanical properties and ductility . General areas of application are propellers , shafts , spindels , bolts etc. Heat treatment : Normalized at 1000 °C and cooled in air followed by tempering at 560 ?580 °C and air cooling . The tempering temperature may be adjusted within this temperature range to obtain the desired mechanical properties. Coefficent of thermal expansion : 20 ??00 °C 12.0.10-6K-1 20 ??00 °C 12.5.10-6K-1 20 ??00 °C 13.0.10-6K-1