carbon steel welded steel pipes are mainly divided into three processes: electric resistance welding (erw), spiral submerged arc welding (ssaw) and straight seam submerged arc welding (lsaw). the carbon steel welded pipes produced by these three processes have their own positioning in the applicatio

what are black steel pipes?black steel pipes are made of steel that has not been coated with a substrate such as zinc or paint. since it has a dark color surface that is forms by iron oxide during the manufacturing process, it is called black steel pipe.is black pipe mild steel?black steel pipe (mil

at present, steel pipes are widely used and have many types. thermally expanded carbon steel pipe is one of them. it has many advantages, but of course it is not without any disadvantages. the following is a detailed explanation of the advantages and disadvantages of hot-expanded steel pipes by carb

what is heat-expanded steel pipe?thermal expansion is a processing method of steel pipes, which is to process small-diameter steel pipes into large-diameter steel pipes. the mechanical properties of thermally expanded carbon steel pipe are slightly worse than that of hot rolled carbon steel pipe.due

carbon steel black pipe is uncoated steel, also known as black steel. the dark color comes from iron oxide that forms on its surface during the manufacturing process. when a steel pipe is forged, a black scale forms on its surface, giving it the finish seen on this type of pipe.carbon steel galvaniz