... tube making machine. die set,pipe roll set. Roller and mould, welded pipe roller, stainless steel pipe mould ... tool steel Cr12mov as raw materials, mouild steel Cr12mov material set high wear resistance, toughness, resistance to high pressure, high hardness ... , mechanical pattern, on the corner, concave angle phenomena, and to form tolerance of roundness in les than 0.05mm, square tube ...