In the forging process, there are external defects, internal defects and surface defects according to the location of the forging defects.

1. Dimension and weight deviation

1) Under the premise of ensuring that the forgings can be processed into qualified parts, the blanking allowance should be as small as possible;

2) Dimension and shape accuracy refers to the allowable deviation of the forging's external dimensions and shape; weight deviation.

2. Intrinsic quality

Requirements for the metallographic structure, strength or hardness of forgings after heat treatment (although some forgings do not undergo heat treatment, there are also intrinsic quality requirements), as well as regulations for other potential quality defects.

3. Surface quality

Refers to the defects on the surface of forgings, surface cleaning quality and rust prevention treatment.