How does the forging plant cool the forgings?
Release time:
09 Mar,2023
The key to forging cooling specification is to select the appropriate cooling rate. Generally, according to the chemical composition of the blank, structural characteristics, original state, cross-sectional size and other factors, refer to the relevant data to determine the appropriate cooling rate.
Generally, forgings forged with aluminum have a higher cooling rate than forgings forged with steel ingots. The cooling rate of small cross-sectional size forgings is higher than that of large cross-sectional size forgings.
Cooling specifications for small and medium carbon steel and low-alloy steel forgings: Generally speaking, the simpler the chemical composition of the blank, the faster the cooling speed after forging; otherwise, the slower the speed. Therefore, for medium and small carbon steel and low alloy steel forgings, air cooling is used after forging.
Cooling specification for alloy steel forgings: For alloy steel forgings with complex alloy composition, pit cooling or furnace cooling shall be adopted after forging.
Specification for cooling of tool and bearing steels.
Cooling specifications for non-phase change steels: For phase change steels (such as austenitic steels, ferritic steels, etc.), rapid cooling can be used because there is no phase change during the cooling of the forging. At the same time, in order to obtain a single-phase structure after forging and prevent brittleness of ferrite at about 475°C, rapid cooling is also required, so air cooling is usually used after forging.
Cooling specification for air-cooled self-cooling steel: In order to prevent white spots during the cooling process, furnace cooling should be carried out in accordance with certain cooling specifications.
Forgings should not only be cooled according to the specification after the final forging, but also be cooled during the forging process, which is called intermediate cooling. Intermediate cooling is used for forgings that are not completely forged after heating (such as multi-fire forging large-turn crankshafts), forgings that require local heating, and forgings that require blank inspection or defect cleaning during the forging process. The determination of the intermediate cooling specification for forgings is the same as the determination of the final cooling specification.
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