Plastic-coated steel pipes are steel-plastic composite steel pipes with a steel pipe as the base and a plastic anti-corrosion layer welded to the inner surface.

Spiral submerged arc welded steel pipe refers to a metal pipe with a spiral seam welded using the submerged arc welding process.

ASTM A333 seamless carbon steel pipe is a seamless steel pipe produced in accordance with ASTM A333 standards. It is mainly used to transport fluids in low temperature environments.

ASTM A213 alloy steel pipe is a seamless steel pipe specially designed to work in high temperature and high pressure environments.

ASTM A106 Grade B seamless steel pipe is a specification for seamless carbon steel pipe intended for high-temperature service.

GB5310-Seamless steel pipe for high-pressure boilers is a kind of seamless steel pipe specially used for high-pressure boiler manufacturing.