... for tube making machine. die set,pipe roll set. Roller and mould, welded pipe ... .7. Hardness range: 60-63HRC.8. Selection: To produce first-class pipe mould, we must have first ... steel Cr12mov material set high wear resistance, toughness, resistance to high pressure, high hardness, hard quenching.9. Maching ... , on the corner, concave angle phenomena, and to form tolerance of roundness in les than 0.05mm ...