In addition to surface quenching, what are the other applications of induction heat treatment of igwe ikuku di elu?

In addition to surface quenching, induction heat treatment of high frequency quenching machine is also used in the following aspects:

(1) Stress relief and normalizing A flexible water-cooled coil wraps the flush weld of a sleeve, and performs stress relief or annealing at the welding position. Linear short reactor with silicon steel sheet for annealing longitudinal continuous welds of butt welded pipes. The linear inductor heats the weld above the AC3 temperature, which recrystallizes the tissue there. Both ends of the tractor high-pressure oil pipe are cold heading and flared (20 steel), and induction normalizing is also used to restore the grain at the heading head to normal.

(2) Pipes for penetration quenching and tempering oil well engineering, the outer diameter is between φ60 ~ φ410, the wall thickness is between 5 – 16mm, 1000Hz medium frequency power supply has been applied for penetration heating quenching, tempering (600 – 700 mm) ℃) is also carried out with an intermediate frequency power supply. The quenching and tempering of the lead screw blank has also been successfully adopted with intermediate frequency heating.

(3) Application of induction heating for pipe drawing Cold-drawn pipes reduce their diameter in a cold state, and the reduction amount is small each time. In addition, annealing and pickling are required, and the process is complicated. The use of induction heating to draw the tube can increase the diameter reduction by 1.5 times, and cancel the annealing, pickling and other processes.