... steel pipe/welded pipe/galvanized steel pipe/ square tube/spiral steel pipe/ERW steel pipe ,etc.A ... Q345,API5L,GRB,X42-X65 and so on 5.Packaging: Painting black,cap, in bundle6.Application: Petroleum, ... steel pipe/welded pipe/galvanized steel pipe/ square tube/spiral steel pipe/ERW steel pipe ,etc.A ... Q345,API5L,GRB,X42-X65 and so on 5.Packaging: Painting black,cap, in bundle6.Application: Petroleum, ...