... , used in structure scaffolding system, frameISO9001, CE certificatescaffolding pipe, including ERW and Seamless, round and rectangular or square ... , ASTM A106, ASTM A795, ASTM A135, ASTM A500, API 5L, API5CT, UL6, UL797, EN10219, EN10255, EN10240, EN39 ... structural tube, scaffolding tube, water transferring tube, oil pipe, casing pipe, sprinkler fire fighting system tube (with groove available), EMT ...