Plastic-coated composite steel pipe is also called plastic-coated steel pipe. Plastic-coated steel pipe is a steel-plastic composite product with steel pipe as the base pipe, plastic powder as the coating material, a plastic layer on the inner surface, and a plastic layer or other anti-corrosion layer on the outer surface. .

Spiral steel pipe (SSAW pipe) is a spiral seam steel 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. The spiral steel pipe sends the strip steel into the welded pipe unit, and after rolling by multiple rollers, the strip steel is gradually rolled up to form a circular tube blank with an opening gap. Adjust the reduction amount of the squeeze roller to control the gap between the weld seams at 1~3mm, and make the two ends of the weld joints flush.

The inspection and inspection of the quality of the billet and the necessary cleaning of the surface defects of the billet are the basic prerequisites to ensure that the blanks used in the production of seamless steel pipes meet the quality requirements.

There are many ways to link steel pipes (such as seamless pipes and welded steel pipes), and the commonly used ones are:Compression type, union type, compression type, pusher type, taper thread type, socket welding type, union type flange connection, welding type and derivative series connection methods combining welding and traditional connection.

Steel pipes (seamless or welded steel pipes) are used to convey fluids and powdery solids, exchange heat, manufacture mechanical parts and containers, and are also an economical steel.

SSAW pipe refers to the welded steel pipe with spiral seam welded by submerged arc welding process. Generally used in: welding into pipelines for fluid transportation, metal structures, pile foundations, etc. The feature is that it can produce welded pipes with larger diameters with narrower blanks, and it can also produce welded pipes with different diameters with the same width blanks. The production cost is low, the process is simple, and it is easy to produce large-diameter pipes.