Oil pipelines, as important equipment for oilfield production and oil and gas transportation, will suffer severe corrosion after long-term use. If the pipeline anti-corrosion work is not in place, it will not only reduce the service life of the oil pipeline, but also have a negative impact on the quality of oil products, and will cause serious environmental pollution.

Carbon (C): The carbon content in the steel increases, the yield point and tensile strength increase, but the plasticity and impact decrease.

Seamless carbon steel pipes are made of steel ingots or solid billets through perforation to make capillaries, and then hot-rolled, cold-rolled or cold-drawn.

LSAW steel pipe is a welded pipe produced by pressing (rolling) a single medium and thick plate into a tube blank in a mold or a forming machine, using double-sided submerged arc welding and expanding its diameter.

High frequency resistance welded pipes are widely used. The produced steel pipe requires straight welds, no burrs, and no defects such as cracks, cracks, and unwelded welding, and the surface of the steel pipe does not exceed the specified scratches, pressure injuries and other defects.

Thick-walled seamless square pipe is a square steel pipe with four corners, which is a square steel pipe formed by cold drawing and extrusion of seamless steel pipe.