Cast iron (Cast Iron Pipe), the casting of cast iron pipes. Cast iron pipe for water supply, drainage and gas pipelines, including cast iron pipe and pipe fittings. Labor intensity. According to different casting methods, divided into continuous cast iron pipe and centrifugal casting iron pipe, in which centrifugal casting iron pipe can be divided into two types: sand and metal. By different divided into gray cast iron and ductile iron pipe. According to different interfaces are divided into flexible joint, flange interface, self-anchored rigid interface, interface, etc. Among them, the flexible rubber ring seal for cast iron pipe; flange joint cast iron pipe flange fixed pad rubber flange gasket seal large rigid interface socket cast iron pipe, straight tube inserted, sealed with cement, this process has been basically eliminated.

Steel pipes (Steel pipe) production began with the development of technology in bicycle manufacturing, early 19th century oil development, during World War two naval vessels, boilers, aircraft manufacturing, thermal power plant boiler manufacturing after World War II, development and oil and gas drilling and production in the chemical industry and transport, forcefully driving the steel pipe industry in varieties, yield and quality of development.

Steel pipes are not only used for conveying fluids and solid powder, exchange of thermal energy, manufacture of mechanical components and containers, it is an economical steel. Steel pipe manufacturing network of building structures, pillars, and mechanical shield can reduce weight, save metal 20~40%, and mechanical construction of the factory. Steel pipe manufacturing not only saves steel, simplify the construction of highway bridges, and can greatly reduce the area of the coating layer, save investment and maintenance costs.