Which abrasive material should not be used on ferrous alloys with a strength of 220,000 PSI?

The most suitable answer to the question is that garnet should not be used on ferrous alloys with a strength of 220,000 PSI. This is primarily because garnet is relatively soft compared to other abrasives and may not provide the effectiveness needed for cutting or grinding high-strength ferrous materials without leading to excessive wear or buildup of material.

In the context of other options, aluminum oxide is known for its hardness and durability, making it suitable for use on high-strength alloys. Silicon carbide, while also a hard material, is often used for a variety of metals including ferrous alloys, offering a good balance of cutting ability and wear resistance.

Glass beads refer to a different application, typically used for surface finishing or peening, and they don’t possess the cutting characteristics that would damage or alter the properties of high-strength ferrous materials. Therefore, while options like aluminum oxide, silicon carbide, and glass beads are suitable for certain applications on ferrous alloys, garnet is less effective and potentially detrimental when working with materials of such high strength.