Steel plate heat treatment refers to a process of heating and cooling the steel plate to change its physical and chemical properties. According to different treatment purposes and requirements, steel plate heat treatment can be divided into many types. This article will introduce several common types of steel plate heat treatment processes.
1. Fire extinguishing
Fire extinguishing refers to heating the steel plate to the critical temperature and then cooling it rapidly to make the steel plate reach the required hardness and strength. There are many methods of fire extinguishing, such as water quenching, oil quenching, gas quenching, etc. Water quenching is the most common fire extinguishing method. By immersing the steel plate in cooling water, the surface of the steel plate is rapidly cooled, thereby producing martensitic structure and improving the hardness and strength of the steel plate.
2. Tempering
Tempering refers to heating the steel plate that has been extinguished to a lower temperature and then cooling it to reduce the brittleness and internal stress of the steel plate. The temperature and time of tempering depend on the composition and purpose of the steel plate, and are usually carried out between 300℃ and 700℃. Tempering can make the steel plate reach a certain toughness and plasticity and improve its performance.
3. Normalizing
Normalizing refers to heating the steel plate to an appropriate temperature and then cooling it to improve the structure and performance of the steel plate. The temperature and time of normalizing need to be adjusted according to the composition and requirements of the steel plate, usually between 800C and 950℃. Normalizing can make the steel plate achieve good mechanical properties and wear resistance, and is widely used in the field of mechanical manufacturing.
4. Quenching
Quenching refers to heating the steel plate to a critical temperature and then rapidly cooling it so that the steel plate forms a martensitic structure. There are many methods of quenching, such as water quenching, oil quenching, gas quenching, etc. Quenching can make the steel plate achieve extremely high hardness and strength, but it will also increase the brittleness of the steel plate. Therefore, tempering treatment is usually required after quenching to improve the toughness and plasticity of the steel plate.
5. Baking
Baking refers to heating the steel plate to a lower temperature and then cooling it to eliminate the stress of the steel plate and improve its structure. The temperature and time of baking are usually relatively low, generally between 200℃ and 400℃. Roasting can make the steel plate achieve better toughness and plasticity, which is suitable for situations where the strength requirements of the steel plate are not high.
6. Quenching brittleness test
The quenching brittleness test refers to the uation of the brittleness resistance of the steel plate by heating the steel plate to an appropriate temperature and then cooling it rapidly. The quenching brittleness test can judge the brittleness resistance of the steel plate by observing whether the steel plate cracks or breaks during the test. The quenching brittleness test is one of the important means to uate the quality of steel plates.
In summary, the types of heat treatment processes for steel plates include extinguishing, tempering, normalizing, quenching, roasting and quenching brittleness test. Different process types can make the steel plate meet different performance requirements and improve the hardness, strength, toughness and plasticity of the steel plate. According to the specific composition and requirements, choosing the appropriate heat treatment process type can enable the steel plate to obtain the best performance.
1. Fire extinguishing
Fire extinguishing refers to heating the steel plate to the critical temperature and then cooling it rapidly to make the steel plate reach the required hardness and strength. There are many methods of fire extinguishing, such as water quenching, oil quenching, gas quenching, etc. Water quenching is the most common fire extinguishing method. By immersing the steel plate in cooling water, the surface of the steel plate is rapidly cooled, thereby producing martensitic structure and improving the hardness and strength of the steel plate.
2. Tempering
Tempering refers to heating the steel plate that has been extinguished to a lower temperature and then cooling it to reduce the brittleness and internal stress of the steel plate. The temperature and time of tempering depend on the composition and purpose of the steel plate, and are usually carried out between 300℃ and 700℃. Tempering can make the steel plate reach a certain toughness and plasticity and improve its performance.
3. Normalizing
Normalizing refers to heating the steel plate to an appropriate temperature and then cooling it to improve the structure and performance of the steel plate. The temperature and time of normalizing need to be adjusted according to the composition and requirements of the steel plate, usually between 800C and 950℃. Normalizing can make the steel plate achieve good mechanical properties and wear resistance, and is widely used in the field of mechanical manufacturing.
4. Quenching
Quenching refers to heating the steel plate to a critical temperature and then rapidly cooling it so that the steel plate forms a martensitic structure. There are many methods of quenching, such as water quenching, oil quenching, gas quenching, etc. Quenching can make the steel plate achieve extremely high hardness and strength, but it will also increase the brittleness of the steel plate. Therefore, tempering treatment is usually required after quenching to improve the toughness and plasticity of the steel plate.
5. Baking
Baking refers to heating the steel plate to a lower temperature and then cooling it to eliminate the stress of the steel plate and improve its structure. The temperature and time of baking are usually relatively low, generally between 200℃ and 400℃. Roasting can make the steel plate achieve better toughness and plasticity, which is suitable for situations where the strength requirements of the steel plate are not high.
6. Quenching brittleness test
The quenching brittleness test refers to the uation of the brittleness resistance of the steel plate by heating the steel plate to an appropriate temperature and then cooling it rapidly. The quenching brittleness test can judge the brittleness resistance of the steel plate by observing whether the steel plate cracks or breaks during the test. The quenching brittleness test is one of the important means to uate the quality of steel plates.
In summary, the types of heat treatment processes for steel plates include extinguishing, tempering, normalizing, quenching, roasting and quenching brittleness test. Different process types can make the steel plate meet different performance requirements and improve the hardness, strength, toughness and plasticity of the steel plate. According to the specific composition and requirements, choosing the appropriate heat treatment process type can enable the steel plate to obtain the best performance.
