DN 1200/1800 large diameter spiral steel pipe refers to a large diameter spiral steel pipe with a nominal diameter (DN) of 1200 mm or 1800 mm.

S235JR spiral carbon steel pipe is a carbon steel pipe with a spiral shape made of S235JR steel.

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.