galvanized pipe standards ASTM, API, DIN, EN, BS, JIS, UL for structure, fluid, conduit, sprinkler system,fence tubing galvanized pipe, including ERW and Seamless, ... round and rectangular or square, aew according to standards ASTM A53, ASTM A106, ASTM A795, ASTM A135, ASTM A500, ... so onCERTIFICATE: ISO9001, UL, FM, CE,JIS,API galvanized pipe