Annealing of steel pipesHeating the steel pipe to a certain temperature and holding it for a while, and then enabling it to cool slowly, is called annealing. Annealing of steel pipe is a heat treatment method in which the steel pipe is maintained at a temperature at which phase change or partial pha

1. Hot spinning methodIt fixes the flat blank or pre-formed blank to the rotating mandrel, uses the rotating wheel to apply pressure to the blank, and the rotating wheel simultaneously feeds in the axial direction. After one or more processing, numerous thin-walled hollow rotating systems are obtain

The steel pipe blank is corroded too badly, and a thick iron oxide layer appears on the surface. Because the elements in the steel matrix are not necessarily uniform, some places are rusted deeply, and some places are rusted shallowly, and unevenness appears after pickling. Large uneven pits, such a

Longitudinal seam steel pipe welded steel pipe is heated and physically deformed. If a straight seam welded steel is welded, the data size can be reduced to a large extent. The demand for the straight seam steel pipe project is high, and the external seam welding starts to ensure the penetration of