ERW pipes mean a type of steel pipe manufacturing with the electrical resistance welding process. A steel plate rolled to become a pipe shape and welded with Electric Resistance Welding process. ERW steel pipe is usually designed in high diameter. The process requires a variety of reasonable arrangement, the typical manufacturing process of high frequency welded pipe is complicated. We will make a brief introduction of its manufacturing process in the next passage.  

Seamless Steel Pipe is made from a solid round steel pillar which is heated and pushed or pulled over a form until the steel is shaped into a hollow tube. According to the production method, the hot rolled tube, the cold rolled tube, the cold drawn tube, the extruded tube, the top tube and the like are seamlessly divided. According to the cross-sectional shape, the seamless steel tube is divided into two types: round and irregular, and the special-shaped tube has a variety of complex shapes such as square, oval, triangular, hexagonal, melon-shaped, star-shaped and finned tubes. They can be divided into thick-walled tubes and thin-walled tubes according to different uses. Seamless steel tubes are mainly used as petroleum geological drilling tubes, cracking tubes for petrochemical industries, boiler tubes, bearing tubes, and high-precision structural steel tubes for automobiles, tractors, and aviation.