How much do you know about the induction heating annealing heat treatment method of bearing steel using ultrasonic induction annealing equipment?

Bearing steel is widely used to manufacture the rolling elements balls and rollers of rolling bearings. The annealing quality of bearing steel has a serious impact on the performance of bearing steel. Ultrasonic induction annealing equipment is the best equipment for annealing workpieces. Zhengzhou Gou's has been engaged in induction heating equipment for many years. As a leader in the induction heating industry, he is quite familiar with the annealing of workpieces. Today, Zhengzhou Gou's will talk about the annealing treatment method of bearing steel.

(1) Cold-drawn bearing steel recrystallization annealing process: GCr15 cold-drawn steel with a cold deformation of about 30% is heated to 750-800°C at a speed of 20-250°C.S-l for air-cooling annealing. After annealing, the hardness of the steel drops from 225-255HB to 179-197HB, the surface decarburization layer is less than 0.05mm, the oxide film is 0.001-002mm, and the internal stress is basically eliminated.

(2) Effect of induction heating recrystallization annealing. Taking the annealing of GCr15 bearing steel as an example, let's talk about the advantages of induction heating annealing.

Comparison of annealing process and annealing quality of cold drawn GCr15 bearing steel

As can be seen from the above table, when GCr15 bearing steel cold drawn materials are annealed by induction heating using ultrasonic induction annealing equipment, the annealing temperature is higher than that of oil furnace annealing. The induction heating heating rate is also much greater than the traditional annealing heating rate, and the energy utilization rate is also higher. As high as 25.9%, while the energy utilization rate of traditional annealing is only 9.9%. In addition, induction heating annealing also has great advantages in terms of the oxidation amount and decarburization layer of the metal. Through the annealing treatment of 20Cr, 40Cr and other steel materials, a large number of tests have verified that ultrasonic induction heating equipment is a good equipment for annealing bearing steel. It has the advantages of reducing production costs, saving energy, electricity and improving the environment.

Let’s start with the heat treatment of bearing steel annealed by ultrasonic induction annealing equipment. The ultrasonic induction annealing equipment produced by Zhengzhou Gaoshi not only has the advantages of small size and perfect functions, but also has a wide range of applications. It is not only used to anneal bearing steel, but can also be used to quench shafts, tubes, etc. heat treatment.