How is the hot expanded steel pipe formed?
The forming process of hot-expanded steel pipe mainly involves hot-expanded technology, which is a technology to process small-diameter steel pipe into large-diameter steel pipe. The following are the main steps and characteristics of forming hot expanded steel pipe:
Formation process of hot expanded steel pipe
Raw material preparation:
The medium frequency induction heating coil is used to heat the steel pipe to a sufficient temperature for plastic deformation in the subsequent expanding process.
Expanding forming:
At the same time of heating, the steel pipe moves forward on the die under the action of the expanding mandrel and the pushing machine, and gradually expands and forms during the movement. This process is similar to the stretching and shaping of metal, but it is realized by heating and mechanical force here.
Cooling and setting:
The expanded steel pipe needs to be cooled to fix its shape and size. The cooling process needs to control the temperature and time to ensure the performance and quality of steel pipes.
Subsequent processing:
According to the needs, the hot expanded steel pipe is cut, polished and painted to meet the specific needs of customers.
Characteristics of hot expanded steel pipe
Large diameter: Through the thermal expansion process, small diameter steel pipes can be processed into large diameter steel pipes to meet the needs of specific fields. No welding seam (for seamless steel pipe): the seamless steel pipe expanded by heat does not produce welding seam during processing, so it has better bearing capacity and sealing performance.
Strong customization: the specifications and models of hot-expanded steel pipes can be customized according to the needs of customers, which has great flexibility. Mechanical properties: Although the mechanical properties of hot-expanded steel pipes may be slightly inferior to those of hot-rolled steel pipes, they still have sufficient strength and toughness in many applications.
To sum up, the hot expanded steel pipe is formed by heating, expanding forming, cooling and subsequent treatment, and has the characteristics of large diameter, no welding seam (for seamless steel pipe) and strong customization.
