Is the negative deviation of the forging thickness 0?
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I checked the section on forgings in NB/T47008, and it seems that the issue of negative deviation in forging thickness is not mentioned there. In stainless steel-stiff composite plates, the allowable deviation for the thickness of the forged base material is subject to negotiation. Generally, is the negative deviation of forgings 0?
When ordering forgings, the purchaser must provide a \"ordering drawing,\" which specifies the nominal dimensions of the forging as well as the allowable tolerances. When performing strength calculations, I think there’s no need to consider negative deviations separately. Since forgings are generally machined before use, it is sufficient to perform strength calculations based on the nominal thickness specified in the drawings and the allowable tolerances. When using steel plates, if it is specified at the time of ordering that they must be manufactured with a positive deviation, then when calculating strength, the negative deviation can be ignored