Thermal pipe expansion we often refer to refers to steel pipes with relatively low density but strong shrinkage. It is a rough pipe finishing process that uses cross rolling or drawing to expand the diameter of the pipe. Thickening steel pipes in a short period of time can produce non-standard and special types of seamless pipes with low cost and high production efficiency. This is the development trend in the field of international pipe rolling.
The two-step push-type pipe expansion machine used for thermal expansion of steel pipes integrates cone die expansion technology, digital medium frequency induction heating technology, and hydraulic technology into one machine. With its reasonable technology, low energy consumption, low construction investment, and good performance The product quality, wide range of raw materials and product specification applicability, flexible and low-input production batch adaptability have replaced the traditional pull-type diameter expansion technology in the steel pipe industry.
my country's current thermal expansion pipe production standards:
Thermal expanded seamless steel pipe: GB3087-1999.
Thermal expansion seam steel pipe (seamless steel pipe): GB/T3091-2000.
The manufacturing process of thermally expanded seamless steel pipes is complex, and the pipes produced have many specifications. They can be customized according to customer requirements or produced according to standards. Its main materials are 20#, 45# and 16Mn, etc. The size is generally between 108MM and 426MM in outer diameter, and the thickness is between 6MM and 60MM.
Secondly, from the perspective of advantages and disadvantages, thermally expanded seamless steel pipes have excellent physical properties, such as high temperature resistance, pressure resistance, bending resistance, high tensile properties and the ability to withstand impact loads. In addition, due to the seamless production process, its internal and external surfaces are smooth, with high precision, no rust spots, no welding and no damage defects, so it has good corrosion resistance. However, the manufacturing cost of thermally expanded seamless steel pipes is relatively high and the price is relatively expensive.
