First: Production process
The full name of spiral steel pipe is spiral seam welded steel pipe. Now it is generally submerged arc welding, or SSAW (spiral seam submerged arc welded steel pipe) for short. It is rolled into steel pipe with steel coils spirally. There is a spiral weld on the surface, so it is called spiral welded pipe.
Screw thread steel pipe refers to the shape of pipe end. This kind of steel pipe is connected by screw thread. It does not specify which kind of steel pipe it is. Screw thread steel pipe generally refers to oil casing pipe. Screw thread pipe is also called low rib pipe, which mainly expands the heat transfer area by external rib (rib coefficient is 2-3).
Second: Purpose
Spiral steel pipes are mainly used in petroleum drilling, geological drilling, chemical industry, construction, boiler manufacturing, shipbuilding, machinery manufacturing, aircraft and vehicle manufacturing, national defense industry and daily light industry.
The threaded steel pipe is generally used in situations where the heat transfer coefficient inside the pipe is more than one time of that outside the pipe. For condensation and boiling outside the tube, due to the surface tension, it also has a better strengthening effect.
Third: Raw materials
The raw material of spiral steel pipe is strip steel
