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Heat Treatment
heat treatment services
optimize product's performance through heat treatment
We can supply following heat treatment services:
Normalizing
Annealing
Quenching
Tempering
Carburizing
Nitriding
High-frequency surface hardening
Normalizing
Normalizing stands as a heat treatment procedure employed to increase the hardness of a material while refining its grain size. This process involves heating the material to a precise temperature and subsequently allowing it to cool to room temperature outside the heating apparatus. Through this treatment, the grain size is enhanced, leading to improved uniformity in the microstructure and properties of steel.
Annealing
Annealing serves as a heat treatment method employed to enhance the characteristics of metals and alloys, particularly their ductility and toughness. This process entails heating the material to a precise temperature, maintaining it at that temperature for a predetermined duration, and subsequently gradually cooling it. The objective is to attain a desired microstructure and mechanical properties.
Throughout annealing, alterations occur within the material’s internal structure, impacting its crystal lattice. This process alleviates internal stresses within the material, ultimately boosting its ductility and toughness. As a result, the material becomes more amenable to deformation processes.
Annealing is a heat treatment process used for metal materials. Various types of annealing methods include:
- Full Annealing: The material is heated to a sufficiently high temperature and then slowly cooled. This process enhances the material's toughness and machinability.
- Normalizing Annealing: Similar to full annealing, but the material is allowed to cool naturally to a temperature below room temperature before being quenched. This method is often used for heavy steel parts to increase their strength and hardness.
- Spheroidizing Annealing: The material is heated close to its critical temperature and then slowly cooled. This process results in a more even distribution of carbon and the formation of smooth geometric shapes, thereby improving processing performance.
- Aging Annealing: The material is heated to a specific temperature and held at that temperature for a set period to allow alloying elements in its solid solution to precipitate, leading to changes in its physical and mechanical properties.
- Stress-Relief Annealing: The material is heated to an appropriate temperature and then slowly cooled to eliminate any stress or defects in the material. This treatment enhances the material's machinability and corrosion resistance.
These annealing methods can be chosen based on the type of metal and specific application scenarios to achieve optimal results.
QT
Quenching and Tempering (QT) is a heat treatment process aimed at enhancing the mechanical properties of materials, particularly steel.
The duration and temperature for each stage of the QT process are meticulously controlled to attain the desired material characteristics. QT can enhance the material’s yield strength, tensile strength, toughness, as well as its resistance to impact and fatigue.
During the quenching phase of QT, the material is heated to a specific temperature and then rapidly cooled by immersion in a quenching medium, such as water or oil. This rapid cooling process renders the material extremely hard and brittle.
Subsequently, the material undergoes tempering. This involves reheating it to a lower temperature and holding it at that temperature for a designated duration. Tempering serves to alleviate the brittleness induced during the quenching process, while retaining some of the hardness and strength acquired in the initial stage of heat treatment.