[sevt_chevelle]

Doug good question. The ring test is used to determine if a part is cast iron or a steel alloy. If you strike a known cast iron object with say a wrench it will make a dull thud sound. Strike a high quality steel alloy piece and it will ring.

The grind test is some what destructive. If you grind a cast iron piece the sparks will be dull red in color and short in length. Cast steel will produce bright yellow sparks and contain what they call bursts at the tips.


http://www.knucklebusterinc.com/feat...fyMetal_01.jpg