Carbon steel pipe is made of steel ingot or solid round steel by piercing and then hot rolling, cold rolling or cold drawing. Carbon steel pipe plays an important role in China's steel pipe industry. The main materials are q235, 20 #, 35 #, 45 # and 16mn. The main executive standards include national standards, American standards, Japanese standards, etc. The national standards include the standards of the Ministry of Chemical Industry, Sinopec pipe fittings standards, and power pipe fittings standards.