The manufacture of piping fittings, steel pipes, pipes, french series products, thermostats, coatings, grinding resistance, spherical casting iron pipes and fittings for pipes, preservation materials, temperature-preserving materials and high-density polyethylene outer protective tubes, heat pipe pipes, spring hangers, pyrotechnic piping equipment, electric piping fittings, parts of chemical pipelines, electric wind doors, human holes, plastic plywood pipes, sales pipes, plates, wires, types, steel, compensatorys, etc。