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A series of treatment processes related to cold drawn precision steel tubes
Aug 16, 2018

With the increasing number of steel pipe industry, the classification of steel pipes is becoming more and more refined, and cold drawn precision steel pipes are one of them. Of course, the processing technology of the product is also well understood. For example, annealing is to heat the cold-rolled precision bright steel pipe to a suitable temperature. Different holding time is used according to the material and the workpiece size, and then slowly cooled, so that the internal structure of the metal reaches or Close to equilibrium, good process performance and performance, or tissue preparation for further quenching.

 

The heat treatment process of the cold drawn precision steel pipe also includes normalizing, that is, cooling the cold-rolled precision bright steel pipe to a suitable temperature and then cooling in the air. The effect of normalizing is similar to annealing, except that the resulting structure is finer, often used to improve the cutting performance of materials, and sometimes used as a final heat treatment for some less demanding parts.

 

If the cold-rolled precision bright steel tube is heated and insulated, the process of rapid cooling in quenching medium such as water, oil or other inorganic salts or organic aqueous solution is called quenching. After quenching, the cold-rolled precision bright steel tube becomes hard, but at the same time Become brittle. In order to reduce the brittleness of the cold-rolled precision bright steel pipe, the quenched cold-rolled precision bright steel pipe is insulated for a long time at a suitable temperature higher than room temperature and lower than 650 ° C, and then cooled. This process is called tempering. .

 

In order to obtain a certain strength and toughness, the process of combining quenching and high-temperature tempering is called quenching and tempering. After quenching some alloys to form a supersaturated solid solution, it is kept at room temperature or a slightly higher temperature for a longer period of time to increase the hardness, strength or electrical magnetic properties of the alloy. Such a heat treatment process is called aging treatment.

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