The difference between annealing and tempering is: annealing means that no hardness is required, and tempering still retains a certain degree of hardness.

1. Normalizing, annealing, quenching, and tempering are the four basic processes in the overall heat treatment. Quenching and tempering are closely related and are often used in conjunction with each other. Integral heat treatment is a metal heat treatment process that heats the workpiece as a whole and then cools it at an appropriate speed to change its overall mechanical properties.

2. Annealing is to heat the workpiece to an appropriate temperature, use different holding time according to the material and workpiece size, and slowly cool it, the purpose is to make the internal structure of the metal reach or close to the equilibrium state, obtain good process performance and use performance, or for further quenching Prepare for organization.

3. Normalizing is to heat the workpiece to a suitable temperature and then cool it in the air. The effect of normalizing is similar to annealing, except that the resulting structure is finer. It is often used to improve the cutting performance of materials, and sometimes used for some less demanding The part is treated as the final heat treatment.

4. Quenching is to quickly cool the workpiece in a quenching medium such as water, oil, other inorganic salts, and organic aqueous solutions after heating and holding the workpiece. After quenching, the steel becomes hard, but at the same time it becomes brittle. In order to maintain the brittleness of steel parts, the quenched steel parts are kept at an appropriate temperature higher than room temperature and lower than 710 degrees for a long time, and then cooled. This process is called tempering.

cast iron bed plates

Jinggong Measuring Tools Producing Co., Ltd is specializing in manufacturing and exporting all kinds of cast iron products，especially for cast iron floor plates, cast iron surface plates, cast iron clamping plates, cast iron angle plates, cast iron box table and other machine tool castings. The products have the features of reasonable design, stable structure, superior quality and competitive price.