steel pipe standards ASTM, API, DIN, EN, BS, JIS, UL, used in structure, liquid transfering, sprinkler syetem.EMT,frame steel pipeincluding ERW and Seamless, round and rectangular or square, aew according to standards ASTM A53, ASTM A106, ASTM A795, ASTM A135, ASTM A500, API 5L, API5CT, UL6, UL797, EN10219, EN10255, EN10240, EN39(BS1139), DIN2440/DIN2444, JIS G3444, BS1387, DIN2394, DIN2395, or ...