After the steel pipe is heated and tempered by a high-frequency induction heating machine, its mechanical properties are more uniform and stable.

When it comes to the heat treatment of steel pipes, many people will say to use a high-frequency induction heating machine. The mechanical properties of the steel pipes after heat treatment using this equipment are more uniform and stable. So what is the reality? Next, everyone will follow the editor to find out.

Anatomical tests of oil well steel pipes that have been induction heated and quenched and tempered by a high-frequency induction heating machine show that the distribution of mechanical properties along the length of the pipe is uniform; the distribution of hardness along the wall thickness of the steel pipe is also uniform. The reason is that the quenching and tempering heating temperatures can be precisely controlled. According to the currently adopted temperature and heating power closed-loop control technology, the quenching and tempering heating temperatures can be controlled at a level of ±10°C. At the same time, the steel pipe passes through the sensor at a certain rotation speed, so that all parts of the steel pipe are evenly heated, maintaining the uniformity of the temperature of the entire steel pipe and the entire batch of steel pipes. Therefore, accurate control of the temperature system and uniform heating methods ensure the uniformity of the mechanical properties of the steel pipe after heat treatment.

According to statistical results, the mechanical properties of induction heating quenched and tempered steel pipes with a diameter of 140mm and a wall thickness of 10-15mm are uniform, the fluctuation range is small, and they fully comply with the standards.

Similarly, the inspection results of N80 grade steel pipe after tempering treatment show that the hardness after induction heating quenching is 520-570HV, and the hardness is evenly distributed along the pipe wall after tempering, with a fluctuation range of ±5HV.

The tempered structure of the steel pipe is a fine tempered sorbite structure with fine grains and uniformly distributed carbides. There are fine tempered sorbite along the outer surface, middle and inner surface of the pipe wall. As a result, the steel pipe has uniform hardness and properties. This tempered troostite structure ensures the high strength and high toughness of the steel pipe, ensuring the high reliability of the steel pipe during use.

In summary, after induction heating by a high-frequency induction heating machine and quenching and tempering heat treatment, the performance of the steel pipe is uniform and stable, meeting the work requirements. If you want to understand the process of induction heating and quenching and tempering heat treatment of steel pipes, you can read more books on heat treatment. I believe you will gain a lot.