API Spirial Steel Pipe (1)Standard: GB, ASTM, API (2)Standard: GB/T 3091-2001 (3)Grade:10#-45 ... 1626, DIN 1629/3,...Grade: 10#-45#, A53-A369, API J55-API P110, ST3...Grade: 10#, 20#, A53(A,B), A106 ... (B,C), API J55, ...Thickness: 6 - 25 mmSection Shape: RoundOuter Diameter: 219 - ... -22-59522057 Fax : +86-22-59522056Mobile Phone :86-13612031373 API Spirial Steel Pipe