galvanized pipe standards ASTM, API, DIN, EN, BS, JIS, UL for structure, fluid, conduit, sprinkler ... 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 ... , furniture tube and so onCERTIFICATE: ISO9001, UL, FM, CE,JIS,API galvanized pipe