... ,BS,GB,ISO material:API 5L, A53,A106,A333 GR6,Q235,Q345 API tube SSAW (Spiral Submerged-arc Welded) Quality standard: API 5L Gas and petroleum ... 53: Gr. A, Gr B, Gr C, Gr.DAPI 5L: A, B, X42, X46, X52, X56, X60, X65 X70GB/T9711: L175, L210 ... ), ExteriorSize Inspection, Hydrostatic Test, X-ray Test.Mill Test Certificate:EN 10204/3.1B Third party inspection:SGS, BV, Lloyds etc.