... the most competitive price. --Welded Square Steel Pipe/Welded Square Steel Tube-- Material of Welded Square Pipe: 1) Q195, Q215 ... ; A53(A, B), A333, A369 Standard of Welded Square Pipe: BS, ASTM, DIN, JIS, ASME O. ... traffic and communication, and so on. --Remark-- Square Steel Pipe is used extremely wide. It is ... cross-sectional area of other non-round steel tube, it has light weight, high intensity, big ...