Hot forging and cold forging are two different metal forming processes that deliver similar results. Let’s take a look at the differences between hot and cold forging and how they pertain to steel forgings.
When a piece of metal is hot forged it must be heated significantly. The average temperatures necessary for hot forging are up to 1150 degrees Celsius for steel, 360 to 520 degrees Celsius for aluminum alloys, and 700 to 800 degrees Celsius for capper alloys. During hot forging, the temperature reaches above the recrystallization point of the metal. This kind of extreme heat is necessary for avoiding strain hardening of the metal during deformation.
Hot forgings are used for the fabrication of parts that have a greater influence in the technical arena. Hot forging is also recommended for the deformation of metal that features a high formability ratio.
Despite the word "cold," cold forging actually occurs at or near room temperature. The most common metals in cold forging applications are usually standard or carbon alloy steels. This process is usually less expensive than hot forging and the end product requires little, if any, finishing work.
Cold forging is also less susceptible to contamination problems, and the final component features a better overall surface finish. It is also better when it comes to interchangeability and reproducibility.
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