SSAW Steel Pipe
GB/T 13793. Longitudinally electric resistance welded steel pipe. SY/T 5040. Spirally submerged arc welded steel pipe piles. ASTM A252. Welded and seamless steel pipe piles. BS EN10219-1. Cold formed welded structural hollow sections of non-alloy and fine grain steels - part1: Technical delivert conditions. BS EN10219-2