Steel pipe fittings, also known as painted plastic pipe fittings, are produced according to the standard CJ/T120-2000 "Plastic-coated Composite Steel Pipe for Water Supply". The main raw materials of the steel elbow are seamless steel pipes and Q235 steel plates. It is formed by crimping and then welding.

Reasons why large-diameter plastic-coated steel pipes can be used for drinking water:
Large-diameter plastic-coated steel pipe is a kind of steel-plastic composite steel pipe. A plastic anti-corrosion layer is welded on the inner surface of the steel pipe (bottom pipe), and a plastic anti-corrosion layer is welded on the inner and outer surfaces.
Large-diameter plastic-coated steel pipes overcome the shortcomings of corrosion, pollution, scaling, and low strength when steel pipes encounter water.
Implementation standard: GB/T5135.20-2010 "Automatic sprinkler system Part 20 coated steel pipe"
Coating method: internal and external spraying
Ambient temperature: -30℃ to 80℃ (peak value 760℃)
Regular pressure: 0.1Mpa-2.5Mpa

Performance characteristics of large-diameter plastic-coated steel pipes: (small diameter ф63-ф110 adopts national standard seamless steel pipe), (for ф160-ф800 diameter, the thickness of the steel plate is determined according to the size of the socket, generally 6mm, 8mm, 10mm, 12mm). After multiple processes such as welding, grinding, and sandblasting the pipe fittings are sent to the plastic spraying factory for pickling, phosphating, and spraying of plastic powder on the inner and outer walls of the pipe fittings (called electrostatic spraying). It is dried at a high temperature of 230℃-250℃ in the furnace to make it firmly adhere to the inner and outer walls.

Advantages of plastic coating: The general coating thickness is between 0.2 mm and 0.3 mm. This coating has good adhesion, strong corrosion resistance, and can withstand strong acids and alkalis. The inside and outside of the pipe are smooth and do not adhere to any substances, effectively reducing the transportation time. resistance. Improve flow and transportation efficiency and reduce transmission pressure loss. There is no leakage material in the coating, so it will not contaminate the transported medium. It can be used alternately between hot and cold in the range of -40℃ to +80℃ without aging or cracking. The average service life can be up to 50 years. Plastic powder complies with the provisions of the American toy standard ASIM-963.96al4.3.5. Plastic steel pipe fittings are mainly used for matching and connecting U-PVC pipes. There are three connection methods: rubber ring, flange, and socket type.

Nowadays, the use of environmentally friendly products has brought great help to our lives. The use of environmentally friendly products is very beneficial to environmental protection. As an environmentally friendly pipe product, plastic-coated pipe fittings are very popular in our lives. Plastic-coated pipe fittings can now be used in various forms of circulating water systems and fire-fighting water systems. They have excellent performance, convenient connection, and strong corrosion resistance. They can greatly improve the efficiency of circulating water and serve the public very well. The pipe fittings produced by plastic-coated pipe fitting manufacturers can also be widely used in drainage transportation in various buildings, providing great convenience for the use of circulating water in buildings. Plastic-coated pipe fittings are also used in the chemical industry, including the transportation of various chemical liquids, and can also be used in ventilation pipes in mines and mines. Moreover, plastic-coated pipe fittings can also be used in urban construction, including the establishment of urban sewage pipelines.