Home Forums General Discussion Specifications Shot size for a required Almen arc height

Designer has called for SS460 steel shots for a specific arc height Almen strip A.

Can we use SS330 shots in place of this?

What will be the effect of this in terms of intensity of compressive stress at a depth from the surface?

Please help to understand this.

With Best Regards/ Tamilmani.

If you still get the required intensity your results will (probably) be ok. The surface finish with the smaller shot will be rougher since the shot must go deeper into the surface. Note: for equal intensities with two shot sizes the dent diameters must be equal but the smaller shot will make a deeper dent. You should always check with the designer (or whomever owns the part) for permission to make a change in shot size, hardness etc. They may have had special reasons for their call-out of the S-460 shot or, maybe they don't care if you make a change.

User has asked for S-780 steel shots Should be used to acieve 14-22 arc height on C Almenn Strip.During testing the arc height does not increase more than 13 with 10 mm CD Nozzle & 80
Please help to understand this.

With Best Regards/ SN Sharma.