Molybdenum mandrels Additional composition Ti: (0.4~0.55)%Zr: (0.06~0.12)% C: (0. 01~0.04) %, Chemical composition: This product is made with molybdenum powder FMo-1 with the addition of trace element Density ≥ 9.3g/cm? Main applications： Used for piercing seamless steel tubes , such as stainless steel , borer steel and high-temperature alloy steel , etc.