... Yangzhou Hengchang Engine Co., Ltd is specialized in steel pipe making machine, welding and forming machine, roller/mould ... Cr12MoV or SKD11 or D2UsageProduce stainless steel, Steel pipe, Copper pipeHeat treatmentVacuum gas quenching and subzero heat treatment( ... heat treatment in China)HardnessHRC58-60Pipe Shapesround pipe, square pipe, rectangle pipe, and oval pipeLife time10 years Producing processa ...