As a high-quality metal material, the heat treatment process of Hastelloy tube is essential to ensure its performance and stability. Heat treatment is to change the internal structure of metal materials by means of heating, heat preservation and cooling to achieve the required performance requirements. For Hastelloy tubes, heat treatment is also an important link.
1. Preheating treatment.
Pre-heat treatment is the first step in the heat treatment of Hastelloy tubes, the purpose of which is to eliminate the residual stress inside the material and improve the plasticity and toughness of the material. Preheat treatment usually consists of two processes: annealing and tempering. Annealing is the process of heating the material to a certain temperature, holding it warm for a period of time, and then slowly cooling it to room temperature. Tempering is to heat the material to a certain temperature again, keep it warm for a period of time and then quench, and then cool it to room temperature. Through pre-heat treatment, the processing and usability of the material can be effectively improved.
2. Solution treatment.
Solution treatment is another important part of the heat treatment of Hastelloy tubes. Solution treatment is to heat the material to a temperature close to the melting point, hold it for a certain period of time, so that the alloying elements are fully dissolved into the matrix, and then quickly cool to room temperature. Solution treatment can enhance the strength and hardness of the material, while improving the corrosion resistance of the material. In the process of solution treatment, it is necessary to pay attention to controlling the heating temperature and holding time to avoid over-burning or coarse grains.
3. Statute of limitations.
Aging treatment is the last link in the heat treatment of Hastelloy tubes. Aging treatment is to heat the material to a certain temperature and keep it warm for a period of time, so that the solute atoms can fully diffuse and precipitate, and strengthen the matrix structure of the material. Aging treatment can improve the hardness and strength of the material, while ensuring that the material has good corrosion resistance. In the aging process, it is necessary to control the heating temperature and holding time to obtain the best aging effect.
To sum up, the heat treatment process of Hastelloy tube mainly includes three links: preheat treatment, solution treatment and aging treatment. Through the reasonable selection and control of heat treatment process parameters, Hastelloy pipes with excellent properties can be obtained. At the same time, in actual production, it is also necessary to pay attention to prevent heat treatment defects, such as overburning, coarse grains, etc., to ensure the quality and stability of Hastelloy tubes.