O.D. from 12-630mm, W.T. 1-60mm, Standards: GB, ASTM ,DIN ,JIS, BS, etc. Grade: ... as per clients' requirements Specification: O.D.12-630mm, W.T. 1- 60mm. Marking: as per customer's requirementDimensions, Mechanical properties ... : Suitable for seawothy transportation or according to customers' requests steel flange