Thermally expanded seamless steel pipe is a steel pipe (seamless steel pipe) with low density but strong shrinkage. The waste pipe finishing rolling process that expands the pipe diameter by cross rolling or drawing method. The outer diameter of the steel pipe can be expanded in a relatively short period of time, and non-standard special specifications and special-shaped seamless steel pipes can be produced. The advantages are low cost and high production efficiency. This is the current development trend in the field of pipe rolling in the world.

Spiral steel pipe (SSAW pipe) is a steel strip made of low-carbon carbon structural steel or low-alloy structural steel, rolled into a tubular shape according to a certain forming angle, and then welded and sewn.

Spiral pipe (SSAW) is a welded pipe made of strip steel coil as raw material, extruded at regular temperature, and welded by automatic double-wire double-sided submerged arc welding process.

Longitudinal rolling refers to the rolling method in which the main flow direction of the deformed metal is always the same as the forward direction of the rolled piece during the rolling process, that is, the deformed metal flows along the rolling centerline to the exit of the pipe mill in the deformed pass formed by the rolls.

Thermally expanded seamless pipe is what we often call thermally expanded pipe. Steel pipes with relatively low density but strong shrinkage (seamless steel pipe) can be referred to as thermally expanded pipes. A rough tube finish rolling process that expands the diameter of the tube by cross rolling or drawing.

Anti-corrosion steel pipes refer to steel pipes that have been processed by anti-corrosion technology, which can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reactions during transportation and use. Generally, it refers to the anti-corrosion treatment of ordinary steel pipes (such as seamless pipes and welded pipes) by special processes, so that the steel pipes have certain anti-corrosion capabilities.