Plastic-lined steel pipes are based on galvanized seamless steel pipes and welded steel pipes. After removing the welding ribs on the inner wall, they are lined with food-grade polyethylene (PE) pipes with the same diameter as the galvanized pipe, and finally pressurized and heated for a certain period of time. It is an upgraded product of the traditional galvanized pipe.

Alloy pipe is a kind of seamless steel pipe. Alloy pipe is divided into structural seamless pipe and high-pressure heat-resistant alloy pipe. Mainly different from the production standard of alloy pipe and its industry, the annealing and tempering of alloy pipe changes its mechanical properties. meet the required processing conditions. Its performance is higher than that of ordinary seamless steel pipes. The chemical composition of alloy pipes contains more Cr, and it has high temperature resistance, low temperature resistance and corrosion resistance.

Boiler tubes are a type of seamless tubes. The manufacturing method is the same as that of the seamless pipe, but there are strict requirements on the steel type used in the manufacture of the steel pipe. According to the use temperature, it is divided into two types: general boiler tube and high pressure boiler tube. Production methods include hot rolling, cold rolling (cold drawing)

Spray cooling method - the spray cooling method refers to the cooling medium ejected from the nozzle to impact the surface of the hot-rolled seamless steel pipe, taking away the heat of the steel and cooling the steel pipe rapidly. Spray cooling methods are divided into outer surface cooling of hot-rolled seamless steel pipes, inner surface cooling and simultaneous cooling of inner and outer surfaces of steel pipes.

Insulation steel pipe is a steel pipe that is processed by heat preservation technology, and under the action of different working environments and external media, the internal temperature and surface temperature of the working steel pipe are guaranteed to meet or meet the requirements of use. Insulation pipes are widely used in liquid and gas transportation pipe networks, chemical pipe insulation engineering petroleum, chemical industry, central heating heating network, central air conditioning ventilation pipes, municipal engineering, etc.

False welding is a common welding defect of welded pipes. It seems that the front and rear steel strips are welded together during welding, but in fact they are not integrated, and the strength of the joint surface is low. The welding seam has to go through a complicated process, especially in the high-temperature furnace area and the high-tension tension-leveling area. The weld seam that is weakly welded is likely to cause a broken belt accident, which will affect the normal operation of the production line.