Standards and Grades: ASTM A106 Grade A/B, A53 Gr A& B, St37, 10#, 20#, 45#, etc. O.D.12-1020mm, W.T. 2 ... -60mm. 1.Specification:O.D.76-720mm; W.T. 2.5~16mm;Length:6 ... .Standard:EN,DIN,APISPEC5L,API5CT,ASTMA53/A106,JIS,BS1387,etc.3.Steel Grade: Q235B,Q345B,API5L Grade B,X42~X80,16Mn,20 ... black paintingAll the production process are made under the ISO9000. API5L Pipeline/ERW Steel Pipe/