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What are the common annealing methods of high frequency annealing machine

What are the common annealing methods of high frequency annealing machine

1. Incomplete annealing: Incomplete annealing is an annealing process in which the iron-carbon alloy is heated to the intermediate temperature of Ac1-Ac3 to achieve incomplete martensitization, followed by slow cooling. Incomplete annealing is mainly suitable for medium, medium carbon steel and high alloy steel forgings, etc.;

2. Spheroidizing annealing: heating the steel to a temperature slightly lower than or higher than Ac1 or changing the temperature around A1 for a period of time, and then slowly cooling. Spheroidizing annealing is used to reduce the high toughness of alloy steel and No. 45 steel after casting;

3. Isothermal annealing: used to reduce the high toughness of some alloy tool steels with high nickel and chromium components to carry out drilling production and processing;

4. Thorough annealing: a sturdy over-temperature mechanism with poor physical properties after forging, casting and electric welding of high carbon steel;

5. Ground stress relief annealing: used to remove thermal stress of steel castings and weldments;

6. External diffusion annealing: used to homogenize the composition of aluminum alloy castings and improve their performance indicators;

7. Work hardening annealing: It is used to remove the hardened state of metal wires and metal sheets in the whole process of cold drawing and cold rolling, and to remove the cold work hardening effect to soften the metal materials.

  1. Graphitization annealing: The high-frequency annealing machine is used to turn pig iron with a lot of cementite into malleable cast iron with excellent plastic deformation. After heating to a certain temperature, heat insulation for a certain period of time and then moderate cooling, so that the cementite dissolves to produce flocculent high-purity graphite.