API Spirial Steel Pipe (1)Standard: GB, ASTM, API (2)Standard: GB/T 3091-2001 (3)Grade:10#-45#, A53-A369 Standard: GB, DIN, ASTM, APIStandard: GB/T 3091-2001, DIN 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 - 3000 mmPlace of Origin: Tianjin China (Mainland) ...