China Chromed Rod Product Description Chrome Hollow Rod made of ST52 material is used as the piston rod of hydraulic cylinders working under standard conditions. Also, when there is a need to reduce overall weight, it is most often with very long travel. It is a standardized vanadium steel with a higher elongation limit and better weldability and machinability. Parameter: Tensile strength: 600-750 N/mm2 Yield strength: min. 500 N/mm2 Minimum chrome thickness 15 microns Minimum chrome plating hardness 800 HVChina Chromed Rod website:http://www.yushenhydralics.com/chromed-rod/