After the electrical pure iron is made into the core, does it need to be annealed at high temperatur

Yes! The technical indicators shown in the national standard are the values after annealing, so annealing is required to fully meet the parameters of the national standard.

Here's how:

There are roughly three methods of pure iron heat treatment: 1. Artificial aging. 2. High temperature purification annealing. 3. Stress relief annealing.

Yaoqiang Pure Iron will now explain the third most commonly used method: stress relief annealing.

Cold working causes a variety of crystal defects (dislocations, lamination faults, etc.) in pure iron, and causes internal stress, which increases the difficulty of magnetic domain wall movement, increases HC and decreases M value (see Figure 7-20). To eliminate these undesirable effects, stress-relieving annealing or recrystallization annealing can be performed. Figure 7-21 shows the effect of annealing temperature on magnetic properties.

The annealing temperature is high, the grain is coarse, and the magnetic properties are favorable, so the highest temperature without phase change is generally used for stress relief annealing to avoid grain refinement when phase change occurs during cooling. Therefore, the recrystallization annealing process system usually adopted by pure iron to eliminate cold working stress is: install the furnace below 600, heat up to 800 with the furnace, then slowly heat to 830 890, keep warm for 4h, and then cool to 700 at a cold rate of no more than 50 h, and finally cool to below 500 with the furnace.

Figure 7-21 Relationship between the magnetic properties of cold-worked pure iron and the annealing temperature.

Compression ratio: 1-45%; 2-94%；

Figure 7-22 Curve of stress relief annealing process of pure iron for electrical engineering <>

Figure 7-20 Effect of cold deformation on the magnetic properties of industrial ferro.

Please refer to GB T6983-2008.

The iron core can be hot-rolled rods, wires, or cold-drawn rods and wires, at least cold working to obtain a smooth surface and higher precision, and cold working will inevitably cause internal changes in the pure iron structure (such as grain refinement or tissue fibrosis), resulting in an increase in internal stress and an increase in the coercivity of the iron core. In order to obtain the desired performance of the core, annealing is carried out, unless a special strong magnetic field core can dispense with this annealing process.

With regard to annealing, the purpose is to coarse the tissue grains and reduce or eliminate the stress on the tissue, so as to obtain a higher initial magnetic susceptibility and a lower coercivity. The annealing temperature is generally 900+10 degrees Celsius. Heat treatment in the ferrite zone, with increasing temperature and longer holding time, results in ideal microstructure and magnetism.

For special pure iron materials, such as the ferrite to austenite transition temperature above 1150 degrees Celsius, or a single ferrite, the annealing temperature can be increased to between 950-1150 degrees Celsius, which can significantly shorten the annealing time, such as 1000 degrees, and the heat preservation can be more than 10 minutes (single sample, batch sample should be extended).

After annealing, the core should not be beaten, knocked or touched hard, and it should also be paid attention to the electroplating layer and assembly.

To put it simply, it is 850 degrees and keeps warm for 3-4 hours. Then it is cooled to 700 at a cold rate of no more than 50 h, and finally cooled to below 500 with the furnace. The entire annealing takes place in hydrogen or vacuum.

I know Luoyang has done this. And the quality is ***, and the magnetic parameters can be guaranteed.

The annealing temperature of electrical pure iron is 850 900 degrees.

Pure iron itself is soft iron and does not need to be annealed.

Liaocheng Dedao metal production industrial pure iron pipe has less carbon content, so the strengthening effect is not good, not suitable for structural engineering steel or tool steel, the carbon content is called steel, and the content greater than this is called cast iron.

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Answer: About 770 degrees Celsius The minimum demagnetization annealing temperature of electrical pure iron is about 770 degrees Celsius. Demagnetization annealing is a heat treatment method that reduces or eliminates magnetism in a material by heating and cooling.

In the case of electrical pure iron, it is usually necessary to demagnetize and annealing at high temperatures to lose its own magnetism and return to a non-magnetic state. 770 degrees Celsius is the curie temperature of electrical pure iron, below which the paramagnetic-ferromagnetic phase transition will occur, thereby reducing or eliminating its magnetic properties. Therefore, 770 degrees Celsius can be considered as the minimum demagnetization annealing temperature for electrical pure iron.

What is the minimum demagnetization annealing temperature of electrical pure iron?

Hello, sorry for keeping you waiting, sorry <>

Answer: About 770 degrees Celsius The minimum temperature of electrician pure iron is about 770 degrees Celsius. Demagnetization annealing is a heat treatment method that reduces or eliminates magnetism in a material by heating and cooling.

For electrical pure iron, in order to lose its own magnetism and return to the non-magnetic state of large liquid, it is usually necessary to demagnetize and annealed at high temperatures. 770 degrees Celsius is the curie temperature of electrical pure iron, below which the paramagnetic-ferromagnetic phase transition will occur, thereby reducing or eliminating its magnetic properties. Therefore, 770 degrees Celsius can be considered as the minimum demagnetization annealing temperature for electrical pure iron.

Electrical pure iron is a quiet metal material with excellent magnetic and electrical conductivity. It is mainly composed of pure iron elements, with no or only very small amounts of impurities. Here are some of the characteristics and applications of electrical pure iron:

1.Magnetism: Electrical pure iron has good magnetism and can produce strong magnetic effects under an applied magnetic field.

It is widely used in the manufacture of magnetic components such as electronic devices, electric motors, transformers, and inductors. 2.Electrical Conductivity:

Electrical pure iron has good electrical conductivity, making it an ideal material for the manufacture of power equipment and power transmission lines. In high-frequency circuits and transformers, electrical pure iron also has low eddy current losses and good thermal conductivity. 3.

Low hysteresis: Electrical pure iron has low hysteresis characteristics, which can quickly respond to changes in the external magnetic field and quickly return to the initial state after the external magnetic field disappears. This makes Electrician Pure Iron ideal for applications such as the manufacture of magnetic recording materials and magnetic heads.

4.Corrosion resistance and abrasiveness: electrical pure iron is relatively stable and has a certain corrosion resistance.

However, corrosion can still occur in humid or acidic environments, so special environments require appropriate measures. In short, electrical pure iron is an important metal material, which has a wide range of applications in the field of electric power, magnetic materials and electronic device manufacturing.