1. Different representations: hot-dip galvanized steel pipes generally refer to the standard nominal diameter of water pipes, which are expressed in DN. Hot-dip galvanized steel pipe SC means that the wire is laid through steel pipe (low-pressure fluid welded steel pipe). SC is an ordinary welded st

The high-frequency induction coil of the straight seam steel pipe should be as close as possible to the position of the extrusion roller. The internal stress of the steel pipe is small and evenly distributed, which can effectively prevent stress corrosion cracking, high dimensional accuracy, and fac

Common Defects of Cathodic Protection for Long-Distance Natural Gas Steel PipelinesAfter a long period of operation, many problems have arisen in the application of cathodic protection systems for long-distance natural gas steel pipelines. On the one hand, the cathodic protection equipment is old an

(1) During the heat treatment process, the cause of the geometric change of the large-diameter steel pipe is the heat treatment stress. Heat treatment stress is a relatively complicated issue. It is not only the cause of defects such as deformation and cracks but also an important means to improve w