permanent 
Seamless steel tubes are commonly used in our life. The application of seamless steel tubes is inseparable from the petroleum and chemical industries. Hot rolled seamless … Read more
Seamless steel tubes are formed at one time during rolling. Welded steel pipes need to be welded after rolling, generally with spiral welding and straight … Read more
The selection of seamless steel tubes should be carried out in accordance with the normal market. Some seamless steel tubes with poor quality often have … Read more
The steel pipe is mainly divided into a seamless steel pipe and a welded steel pipe, and the welded pipe is formed by bending a … Read more
The weld toe of the welded steel pipe is easy to form stress corrosion crack. The stress concentration of the butt joint is mainly caused … Read more
Unlike seamless steel tubes, the pre-weld preparation of galvanized steel pipes is the same as that of ordinary mild steel. It is necessary to pay … Read more
