... Material Can Be Ordered)StandardGB/SY/DIN/ASTM/ASME/ASNI/API/UsageUsed For Gas, Petroleum, Water ,Oil, Structure And ... ,A25,A,BExecutive StandardSY/T5037-2000,GB9711.1-1997,API SPEC 5L ASTM A53Application:structure steel pipe,boiler pipe, ... rasing,Pursuing excellence.Our principle of managemennt:Dedicated manufacture,High quality,Dependent honesty,Best service. API 5L spiral welded steel pipe