A335 STEEL PIPE

ASTM A335 MANUFACTURING PROCESS hot-rolled (squeeze seamless steel tubes): round tube perforation → → → heated three-roll cross rolling, continuous rolled or extruded-cannula → sizing (or reducing) the straightening → → → cooling water pressure test (or testing) → tags → storage cold drawing (rolling) seamless steel pipe: round tube perforated → heat → → → → start → annealing pickling oil (copper) → multi-pass drawing (cold rolled) steel tube heat treatment straightening → →