Forging quality steels...

Forging quality steels Forging quality steels are those steels which are subjected to the process of forging during its subsequent processing for the production of end use products. The process of forging consists of converting the steel material into designed shape at a higher strain rate. Forging quality steels have the property of forgeability which is the relative ability of the steel to flow under compressive loading without fracturing. Except for resulphurized and rephosphorized grades, most carbon and low alloyed steels are usually considered to have good forgeability. Difference in forging behaviour among the various grades of steel is small enough and hence selection of steel for a forging is seldom affected by the forging behaviour Forging process The forging process can be of the following three types. Hot forging – In this process the forging operation is usually done at a temperature of around 1200 deg C. Warm forging – This process is carried out below the recrystallization temperature of steel normally at temperatures ranging from 650 deg C to 750 deg C. Cold forging – This process is performed at room temperature and the steel material is not heated. During the process of forging, since high strain rates are employed, the qualities needed in forging steels are critical and demanding. Further forging components demand specialized treatments necessary for imparting special properties based on the end application of the forgings. Also since the end use of the forged steel products is of critical nature, a close control over all the stages of steel manufacturing process is required. Selection of steel for forging Selection of a type of steel for a forged component is an integral part of the forging process and accepted performance of the steel after forging is dependent on this choice....