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Differences and effects of annealing, normalizing, quenching and tempering

Normalizing annealing tempering

The overall 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. Annealing, normalizing, quenching and tempering are the four basic processes in the overall heat treatment. They are called “four fires”. The quenching and tempering are closely related and often used together.

Normalizing annealing and tempering quenching are four important processes of heat treatment. No process can cause problems, or your product will be affected.



Differences and effects of annealing, normalizing, quenching, and tempering:


Annealing: It is a heat treatment process that heats the workpiece to a suitable temperature, uses different holding time according to the material and the workpiece size, and then slowly cools with the furnace. The essence is to heat the steel after austenitizing and then transforming the pearlite. The purpose is to achieve or close to the equilibrium state of the metal internal structure, to obtain good process performance and performance, or to prepare for further quenching.


Purpose and effect of annealing: reduce the hardness of steel, improve plasticity, to facilitate cutting and cold deformation processing; refine grains, eliminate structural defects caused by forging, welding, etc., uniform steel composition, improve steel properties or Prepare for subsequent heat treatment; eliminate internal stress in the steel to prevent deformation or cracking.


Normalizing: The workpiece is heated to a suitable temperature and then cooled in the air. The effect of normalizing is similar to annealing, but the resulting structure is finer, which is often used to improve the cutting performance of materials, and sometimes used for some low requirements. The part is used as the final heat treatment.


Quenching: heating the workpiece to a certain temperature at a critical point for a certain period of time, rapidly cooling in a quenching medium such as water, oil or other inorganic salts or organic aqueous solutions to obtain martensite and/or bainite structure. Heat treatment process. After quenching, the steel becomes hard but becomes brittle at the same time.



The purpose of quenching is to transform the supercooled austenite into martensite (or bainite) to obtain a martensite (or bainite) structure, and then mix it with tempering at different temperatures to obtain the desired mechanical properties. Quenched workpieces are not allowed to be used directly in the field. Usually, tempering must be performed 1-2 times or more in real time to adjust the microstructure and stress.


Tempering: 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 710 ° C, and then cooled. This process is called tempering.


The purpose and function of tempering: reasonably adjust the mechanical properties to make the workpiece meet the requirements of use; stabilize the structure so that the workpiece does not undergo structural transformation during use, thereby ensuring the size and shape of the workpiece; reducing or eliminating the internal stress of quenching, Reduces deformation of the workpiece and prevents cracking.


Haituo Electromechanical Co., Ltd. is a leading manufacturer of induction heat treatment in China. It has been engaged in the research and development of induction hardening technology for more than ten years. At present, it has a number of core patents. Its quenching machine has been applied to the induction of transmission components and power output components in many industrial fields. Quenching.


Normalizing annealing and tempering quenching is very important. Many people may not know much about these four steps, so we have to know correctly. If you want to know more, then pay attention to Haituo Electromechanical.


Dongguan Haituo Electromechanical Equipment Co., Ltd. is a manufacturer of medium and high frequency induction heating equipment developed earlier in China. It is a private enterprise engaged in the research and development, design, manufacturing, sales and service of many experts specializing in induction heating equipment. With a strong technical R & D team, experienced, customized automatic induction heating equipment according to the workpiece and process, free to provide customers with personalized process solutions. As well as a more comprehensive after-sales service system in various regions of the country, we have won the trust of many domestic enterprises, and have the experience of providing them with quality products and services. Welcome to visit the company.
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