Metal quantity used for cutting stainless steel forgings. The purpose of cutting stainless steel forgings is to ensure that the parts meet the required dimensional accuracy and surface roughness. During the forging process, due to reasons such as under-pressure, die wear, mold misalignment, oxidation and decarburization of stainless steel forgings, and cooling shrinkage, the dimensions of stainless steel forgings are difficult to be precise, and their shapes may also experience warping and deformation, with the surface roughness potentially not meeting the required standards. Therefore, in the production of stainless steel forgings, a layer of additional metal should be left on the forging blank surface, which will be cut off during subsequent processing to ensure the processing quality of the stainless steel forgings. For critical load-bearing parts that require sampling tests or need to be inspected and processed for positioning, extra metal should be left. This excess metal is referred to as a "guarantee metal."

The allowable tolerance range for stainless steel forgings based on their nominal dimensions is referred to as forging tolerance. The single-side allowance and tolerance are shown in the figure. There are two methods to determine the machining allowance and tolerance for stainless steel forgings. One is the tonnage method, commonly used by foundries, which involves selecting based on the forging hammer tonnage. The other is to inspect the shape and dimension data of the forging.

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