Straight seam steel pipe is a welded steel pipe with the weld seam parallel to the longitudinal direction of the steel pipe.

SSAW steel pipe is a spiral seam welded steel pipe made of strip steel coil as raw material. It is often extruded at high temperature and welded by spiral submerged arc welding.

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.