Blank Body heat treatment process according to different materials are as follows:
1. Gray cast iron heat treatment.
In order to achieve different purposes, gray cast iron casting can be carried out in different heat treatment. Valve production of gray cast iron casting body parts, such as after the heat treatment process often chosen are: the elimination of casting thermal stress limitation and elimination of free cementite of high-temperature annealing. Thermal aging process is essential to work together. High temperature annealing only in the casting as a result of the chemical composition and casting cooling rate controlled, resulting in organizations that exist after casting cementite when the new-born to use it to replace the thermal aging.
2. Carbon steel heat treatment.
After the casting steel casting foundry with a large residual stress, and sometimes the organization of large steel castings, and even organizations overheat. Affect the dimensional stability of steel castings, to reduce the mechanical properties of steel and is not conducive to the conduct of cutting. In order to eliminate casting stress, refined organization, improve the mechanical properties and improved, such as machining, valve of carbon steel production body parts such as casting or after the regular choice of annealing normalizing + tempering processing.
3. Austenitic stainless acid-resistant steel-based heat-treatment.
Type austenitic stainless acid-resistant steel is easy to have a major flaw Intergranular corrosion of steel in general can be taken to impose certain measures to prevent heat-treated. Valve production type of austenitic stainless steel acid-resistant parts of the body such as the heat treatment process often selected were: solution heat treatment (quenching), the stability of the processing and cryogenic treatment.
4. Martensite heat-resistant steel-based heat treatment.
Martensite-type heat-resistant steel in the foundry should be promptly after the annealing, prevent the generation of cracks, and holding time should be sufficient annealing (usually 4 to 8 hours). Martensite-type heat-resistant steel annealed to remove stress, to carry out recrystallization, grain refinement, reduce stiffness, improve cutting performance and is ready to do a good job in the final heat treatment.
Martensite-type heat-resistant steel eventually normalizing + tempering heat treatment used to deal with.
5. High-quality carbon steel heat treatment.
Heat treatment of high-quality carbon steel to steel valve body 35, for example, steel valve body 35 to be normalizing after forging, heat treatment and its ultimate valve manufacturer in accordance with the provisions of technical documents in general to quenching and tempering treatment.
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