Thick-walled steel pipes refer to steel pipes whose outer diameter to wall thickness ratio is less than 20 as thick-walled steel pipes. Mainly used as petroleum geological drilling pipes, cracking pipes for the petrochemical industry, boiler pipes, bearing pipes, and high-precision structural pipes

The purpose of steel pipe pile construction is to transfer the load of the superstructure to the deep soil layer with a strong bearing capacity or to compact the weak soil layer to improve the bearing capacity and compactness of the foundation soil. Therefore, it is necessary to ensure that the stee

Connection method of large diameter steel pipe:1. Large-diameter steel pipe heat-shrinkable fittings: When connecting pipes, on-site welding can be used. Welding points cannot be handled at the construction site, and heat-shrinkable pipe fittings are used as supplementary seals, which shrink under t

1. Downhill forming method: downhill shaping of welded steel pipe equipment can significantly reduce edge extension.2. Increase the extension in the middle of the billet: During the forming process, the reduction of the hole pattern is increased, so that the gap between the upper and lower rollers i