A multifunctional heat treatment system for steel pipes

Abstract

A multifunctional heat treatment system for steel pipes, including six sets of rollers, a medium frequency induction furnace device, a high-temperature resistance furnace device, an ultra-fast cooling device, an external shower and an internal spray device, and a low-temperature resistance furnace device; the six sets of rollers are composed of a feeding roller The intermediate frequency induction heating roller group, the air cooling roller group, the ultra-fast cooling roller group, the external shower internal spray roller group and the blanking roller group are arranged in sequence; the intermediate frequency induction furnace device is set in the intermediate frequency induction heating roller group between two adjacent rollers; the high-temperature resistance furnace device is set on one side of the air-cooling roller set; the ultra-fast cooling roller set is set inside the ultra-fast cooling device; the external shower and inner spray device is set on the outer shower and inner spray roller set One side; the low-temperature resistance furnace device is installed on one side of the unloading roller group. The entire process line of the system of the present invention is compact in design and easy to operate. The required equipment can be combined and selected according to process requirements to meet various heat treatment process requirements for steel pipes.

Description

Technical field [0001] The invention belongs to the technical field of heat treatment of steel pipes, and particularly relates to a multifunctional heat treatment system for steel pipes. Background technique [0002] The traditional heating method of steel pipe heat treatment mainly uses gas heating and resistance heating, which consumes a lot of energy. During the heating process, the heating speed is slow, the work efficiency is not high, and the heating time is long. During the heating process, the surface of the steel pipe is prone to produce thicker oxide scale, which reduces The surface quality of the steel pipe. The heating time of the steel pipe is long, the microstructure of the steel pipe is difficult to be refined, and the performance improvement is limited. Considering the continuity and automation of the heat treatment process and the good surface quality and high straightness of the steel pipe after heat treatment, it is the best choice to heat the steel pipe by me...

AI Technical Summary

Problems solved by technology

[0002] Traditional steel pipe heat treatment heating methods are mainly gas heating and resistance heating, which consume a lot of energy. During the heating process, due to the slow heating rate, the work efficiency is not high, and the heating time is long. Steel pipe surface quality

The heating time of the steel pipe is long, the microstructure of the steel pipe is difficult to be refined, and the performance improvement is limited

Considering the continuous and automatic heat treatment process and the good surface quality and high straightness of the steel pipe after heat treatment, it is the best choice to use medium frequency induction heating to heat treat the steel pipe. Induction heating has the advantages of fast heating speed, energy saving, environmental protection and automation. The heating degree is high, the heating process is easy to control, and the manufacturing cost is high. However, this heating method also has the problems of limited holding time and poor temperature uniformity of the steel pipe as a whole.

[0003] In the production process of small and medium-diameter steel pipes, it is generally only necessary to hot-roll or weld large-diameter steel pipes of several specifications, and to produce various specifications of small- and medium-diameter steel pipes through the tension reduction process after reheating to expand the product specification range , improve production efficiency; but after the intermediate reheating process, the austenite phase transformation will re-occur in the pipe structure, and the temperature after tension reducing rolling is greater than Ar 3 (Generally around 850°C), if the subsequent phase transformation is not controlled, it will easily cause the internal structure of the steel pipe to be coarse and the performance will be reduced. It is necessary to use appropriate controlled cooling technology to control the phase transformation after reheating and rolling to improve Microstructure of steel pipe after hot-stretching

At present, the steel pipes after reducing are mostly air-cooled on the cooling bed, the cooling capacity is limited, and the degree of improvement to the structure and performance is limited.

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