Forging Ratio query - Reg

[Ganny]

In forging we ask for forging ration>3s or >4s.
After receipt of forged components do we have methods to check the same by any destructive or non destructive testing.

And does 4s or 3s forging ratio has impact on material mechanical properties.

[Kelly_Bramble]

I think you are referring to the forging reduction ratio... Which is defined as the amount of cross-sectional reduction taking place during drawing out of a bar or billet. The original cross-section divided by the final cross-section is the forging ratio (say 3:1).

I'm not aware of any methods that one can use to verify the the forging ratio, post forging operations. I suppose a density measurement is possible? What should have been done to ensure the right start billet dimensional size is a review of the manufacturing process and billet rough size.

The reason for specifying the ratio is to ensure you're getting a good amount of deformation in the forging to eliminate any porosity in the material and to refine the grain size, as well as to break up inclusions in the starting steel or nonferrous materials.