... leading ERW and SSAW steel pipe manufacturer in China, we can supply high quality petroleum & gas line pipe, water pipe an Usage:Used for ... . Oil drilling and machinery manufacturing, etc. Surface:Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Vanish Coating, Bitumen Coating, Black Oil coating ... Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test. Carbon Steel Line Pipe