Why can annealing reduce the hardness?

Why can annealing reduce the hardness?

 

The heating wire forms austenite when it is heated, and according to different purposes, it is slowly or quickly cooled from high temperature to make it transform.

 

When austenite transforms at different temperatures, its transformation products are not the same, and the properties are also very different.

 

Slow cooling obtains a mixture of cementite and ferrite-pearlite; while rapid cooling obtains martensite, while austenite has no hardness, while martensite has hardness. The result of heat treatment and quenching is the martensite structure.

Why can annealing reduce the hardness of the heating wire?

 

The annealed structure is mainly pearlite, and the hardness of lower bainite and martensite is smaller.

Why can annealing reduce the hardness of the heating wire?

 

The annealed structure is mainly pearlite, and the hardness of lower bainite and martensite is smaller.

The heat treatment process of heating the heating wire to an appropriate temperature, keeping it for a certain period of time, and then slowly cooling (usually cooling with the furnace) is called annealing.

Single-head electric heating tube selection guide-design prerequisites:

 

1. Single-head electric heating tubes are generally non-standard custom-made, and choose according to specific actual working conditions;

 

2. The diameter of the single-head heating tube is less than 6mm, the thinner the more expensive;

 

3. The length of single-head electric heating tube is shorter than 50mm, the shorter the more expensive;

 

4. The higher the surface load of the single-head electric heating tube, the more expensive the price;

 

5. The price of the inner lead of the single-head electric heating tube is much higher than the price of the outer wiring;

 

5. The single-head electric heating tube is not quoted by the meter, and all parameters need to be integrated to quote the price.

When multiple components are connected in series to the power supply, the leakage current test should be performed on this group of components as a whole.

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