... standards ASTM, API, DIN, EN, BS, JIS, UL for structure, fluid, conduit, sprinkler system,fence tubing galvanized pipe, including ERW and Seamless ... ASTM A53, ASTM A106, ASTM A795, ASTM A135, ASTM A500, API 5L, API5CT, UL6, UL797, EN10219, EN10255, EN10240, EN39(BS1139), DIN2440/DIN2444 ... , furniture tube and so onCERTIFICATE: ISO9001, UL, FM, CE,JIS,API galvanized pipe