Gi hollowsQuick DetailsStandard: BS,JIS,GB,DIN,ASTM,API,BS 1387,BS EN10025,BS 4568,BS EN10219,JIS G3441, ... 10305,DIN EN 10025,ASTM A106-2006,ASTM A53-2007,API 5CT,API 5L Grade: 10#-45#,A53-A369,ST35-ST52,Q195-Q345 ... Or Not: Non-secondary Application: Structure Pipe Technique: ERW Certification: API Surface Certificate: ISO 9001:2000 Mark: as requests Delivery time ...