Views: 1 Author: Site Editor Publish Time: 2020-11-09 Origin: Site
Thermal expansion is a processing method of steel pipes, which is to process small-diameter steel pipes into large-diameter steel pipes. The mechanical properties of hot-expanded steel pipes are slightly worse than those of hot-rolled steel pipes. Limited to the limited specifications of seamless steel pipes in steel mills, hot-expanded steel pipes are born according to the needs of end consumers. The specifications and models of heat-expanded steel pipes are relatively random. Generally, they are made according to the needs of customers. Hot-expanded steel pipes are what we often say The heat-expanded pipe is a steel pipe with relatively low density but strong shrinkage.
The two-step push pipe expander used in the hot expanded steel pipe integrates the taper die expanding technology, the digital intermediate frequency induction heating technology, and the hydraulic technology in one machine. With its reasonable technology, low energy consumption, low construction investment, and good The high product quality, wide range of raw materials and product specification applicability, flexible and variable low-input production batch adaptability, replace the traditional pull-and-draw expansion technology of the steel pipe industry. As it is difficult to solve the supply of large-diameter steel pipes in the near future, hot-expanded steel pipes have become an important source of products to solve the shortage of large-diameter steel pipes in our country, alleviating the tight supply situation in the large-diameter steel pipe market.
Seamless pipes are generally produced on continuous pipe rolling mills, also called automatic pipe rolling mills. The round steel is cut to the required length, centered on the perforated end face of the tube blank, and then sent to the heating furnace for heating and perforated on the perforator. When the perforation continues to rotate and advance at the same time, under the action of the roller and the plug, a cavity is gradually formed inside the tube blank, which is called a capillary tube. And then sent to the automatic rolling mill to continue rolling. Later, the whole wall thickness is uniformed by the whole machine, and the diameter is sizing by the sizing machine to meet the specifications.
Hot-dip galvanizing technology of seamless steel pipe.
Hot-dip galvanizing is a practical process to protect steel from atmospheric corrosion. Compared with other anti-corrosion methods, the physical barrier protection and electrochemical protection of its coating, the compactness of the coating, the durability of the coating, the maintenance-free performance of the coating, and the The bonding force of the substrate, the economics of the coating, the adaptability of the hot-dip galvanizing process to the shape and size of the steel parts, and the high efficiency of production have unique advantages and are more economical and effective.