High quality seamless steel pipe for oil field 1. Factory sell 2. OD: 10-630mm 3. ASTM,DIN,JIS, ... 1630,DIN2440, DIN2448,DIN 17175,GB/T8162-2008,EN10204,EN10216-1,EN10216-2,EN10219-1,GB/T8162-2008,GB/T8163-2008,GB3087-2008,GB5310-2008 ... 1630,DIN2440, DIN2448,DIN 17175,GB/T8162-2008,EN10204,EN10216-1,EN10216-2,EN10219-1,GB/T8162-2008,GB/T8163-2008,GB3087-2008,GB5310-2008 ...