... ,ANSI,JIS,DIN,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 pipelines GB ... made with special equipment in compliance with the relevant stanards.Spherical socket joint: provides the possibility of a rotation 10 degrees ...