What is the performance of the piston rod after induction tempering treatment with ultrasonic induction heating equipment?

The piston rod is a connecting component that supports the work of the piston. It is mostly used in oil cylinders and cylinder motion execution components. It is a moving component with frequent movements and high technical requirements. During the working process, the piston rod has to withstand huge friction. For this reason, we often use ultrasonic induction heating equipment for quenching and tempering heat treatment to improve the hardness, wear resistance and service life of the piston cylinder. The effect is very good. Today, the editor will tell you about the performance of the piston rod after being tempered and heat treated by ultrasonic induction heating equipment?

For the 42CrMo steel hot-rolled steel piston rod blank, the hardness and metallographic structure of the blank with a diameter of 50mm×800mm were analyzed along the cross section through induction heating and quenching and tempering. The results are shown in the table below. The following two results can be drawn from the data in the table below.

(1) The induction heating quenching and tempering treatment process is effective for steel rods with a diameter of 50mm. Because within 20mm from the surface to the center (that is, 40mm in diameter), the metallographic structure is a fine and evenly distributed tempered sorbite structure and a small amount of ferrite. It shows that the quenched structure in this area is basically fine lath martensite and there is very little retained austenite. The presence of more massive ferrite in the center indicates that the cooling rate is too slow during quenching, and a certain amount of retained austenite is not completely martensite. During tempering, massive ferrite is formed, resulting in a decrease in hardness. However, it generally meets the technical requirements.

(2) Appropriately adjust the quenching temperature and tempering temperature to obtain a better combination of strength and toughness. Judging from the hardness data in the table, there is still some potential for 42CrMo steel. By lowering the quenching and tempering temperature and increasing the quenching cooling rate, better results can be obtained.

In summary, the induction heating quenching and tempering treatment method can be used to achieve consistent heat treatment effects on steel materials with a diameter of less than 60mm.