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When the temperature exceeds 300 degrees C-400 degrees C (blue brittle area of steel) and reaches 700 degrees C-800 degrees C, the deformation resistance will be reduced sharply and deformation can be greatly improved. According to the forging processing in different temperature areas, for the forging quality and forging process requirements, can be divided into cold forging, temperature forging, hot forging three molding temperature areas.

Originally this temperature area is not strictly bounded, generally speaking, in the temperature area with recrystallization of the forging process called hot forging, not heated at room temperature forging processing called cold forging. The size of the forgings varies very little during low-temperature forging. Forging processing below 700 degrees C, oxidation skin formation is less, and the surface is not decarbonized phenomenon. Therefore, as long as the deformation can be in the forming energy range, cold forging is easy to get good dimensional accuracy and surface finish. As long as the temperature is controlled and the lubrication cools down, the temperature forging below 700 degrees C can also obtain good accuracy. When hot forging, large forgings with complex processing shapes can be forged due to the small deformation energy and deformation resistance. For forgings with high-size accuracy, they can be processed with thermal forging spree in a temperature area of 900 degrees C-1000 degrees C. In addition, pay attention to improve the hot forging work environment.

Forging life (hot forging 2-5 thousand, temperature forging 1-2 million, cold forging 2-5 million) compared to other temperature range forging processing is shorter, but it has a large degree of freedom and low cost. The blanks are deformed and hardened during cold forging, so that the forging mold sits on a high load, so that high-strength forging soldering and hard lubrication film treatment methods to prevent wear and bonding are required. In addition, in order to prevent blank cracks, when needed to carry out intermediate annealing to ensure the required deformation capacity. In order to maintain a good lubrication state, the blanks can be phosphated. In the continuous processing with rod material and disc, the section can not be lubricated at present, the possibility of using phosphating lubrication method is being studied.

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