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How to classify surface heat treatment

Industrial surface heat treatment processes can be roughly divided into three categories: overall surface heat treatment, surface surface heat treatment and chemical surface heat treatment. Different surface heat treatment techniques are used for the same metal, which can achieve different arrangements and then have different functions. Let's take a look at specific issues to see what three methods are used for surface heat treatment:

First, the overall surface heat treatment
1. Annealing is to heat the workpiece to the proper temperature. According to the data and the workpiece scale, different holding time is selected, and then the cooling is performed slowly. The intention is to arrange the metal inside to reach or close to the equilibrium condition, and obtain outstanding technical functions and functions. Perhaps Prepare for further quenching.
2. Normalizing is to cool the workpiece to a suitable temperature and then cool it in the air. The effect of normalizing is similar to annealing. The only arrangement is finer, which is often used to improve the cutting function of the data, and sometimes used for some low demand. The part is heat treated as the end surface.
3. Quenching is to rapidly cool the workpiece in a quenching medium such as water, oil or other inorganic salts or organic aqueous solutions after heating and holding the workpiece. After quenching, the steel pieces become hard but become brittle together.
4. In order to reduce the brittleness of the steel, the quenched steel is heat-treated for a long time at a suitable temperature above room temperature and below 650 ° C, and then cooled. This technique is called tempering. Heat treatment



Second, the external surface heat treatment is a metal surface heat treatment technology that only heats the surface layer of the workpiece to modify its surface mechanical function. In order to heat only the surface of the workpiece without excessive heat being introduced into the interior of the workpiece, the heat source used must have a high energy density, that is, to give a large amount of heat energy to the workpiece per unit area, so that the surface layer or part of the workpiece can be short-time or instantaneous. Arrive at high temperatures. The primary methods for surface heat treatment are flame quenching and induction heating surface heat treatment. Commonly used heat sources are aerobic acetylene or oxypropane flames, induced currents, lasers and electron beams.
 
Third, chemical surface heat treatment
Chemical surface heat treatment is a metal surface heat treatment technique that modifies the chemical composition, arrangement and function of the surface of the workpiece. The chemical surface heat treatment is different from the surface surface heat treatment in that the latter changes the chemical composition of the surface layer of the workpiece. Chemical surface heat treatment is to heat the workpiece in a medium (gas, liquid, solid) containing carbon, nitrogen or other alloying elements for a long time, and then let the surface of the workpiece enter elements such as carbon, nitrogen, boron and chromium. After entering the element, other surface heat treatment techniques such as quenching and tempering are sometimes performed. The primary methods of chemical surface heat treatment are carburizing, nitriding, and metal infiltration.

The development of science and technology has forced the rapid development of all walks of life. There are more and more surface heat treatments applied in the steel industry. Different surface heat treatment methods produce different processing parts. Only by knowing which kinds of treatment methods are available can they be more Conducive to his work.
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