Annealing cooling temperatures can vary significantly depending on the specific type of annealing process being used. Each type of annealing has its own unique temperature requirements and cooling rates.
What Temperature is Annealing Cooled? 6 Key Temperatures You Should Know
1. Full Annealing
In full annealing, carbon steel is slowly heated to a temperature of 50°C (122°F) above the austenitic temperature. This temperature lies between 750-900°C (1320-1652°F), also known as the "holding temperature." After reaching the holding temperature, the steel is cooled down slowly to room temperature. The recommended cooling rate for full annealing is 20°C (68°F) per hour.
2. Recrystallization Annealing
The purpose of recrystallization annealing is to transform a structure that has been straightened due to cold forming and restore the original material properties. The typical recrystallization temperatures for unalloyed steels range between 450 and 600°C, while for medium- to high-alloy steels, the range is between 600 and 800°C.
3. Subcritical Annealing
Subcritical annealing for steels takes place at temperatures between 538°C and 649°C (1000°F - 1200°F), where no crystal structure change occurs.
4. Intermediate Annealing
Intermediate annealing is carried out at temperatures between 649°C and 760°C (1200°F - 1400°F), resulting in some transformation to austenite.
5. Full Annealing
Full annealing involves completely austenitizing the workpiece at temperatures between 816°C and 927°C (1500°F - 1700°F).
6. Solution Annealing
Solution annealing is primarily used for austenitic stainless steel, where its main function is to dissolve precipitation phases (e.g., carbides) in mixed crystals. The standard temperature range for this heat treatment is from 900°C to 1100°C.
It's important to note that different materials and alloys may have specific annealing requirements, and the cooling process can vary based on those requirements. Cooling can occur in a vacuum, reducing atmosphere, or air, depending on the desired surface finish and decarburization control. In some cases, rapid cooling or cooling in nitrogen may be employed to achieve specific mechanical properties or prevent the reformation of carbides.
Continue exploring, consult our experts
Looking for laboratory equipment to optimize your annealing process? Look no further than KINTEK! Our range of cooling equipment ensures precise and efficient cooling at different temperature ranges for various types of steel annealing. Boost your productivity and achieve superior results with KINTEK. Contact us now for a customized solution!
