Pieces of steel in cylinder??

It takes over 350*F to melt solder.
Babbit takes ~460*F
aluminum takes over 1200*F
Whatever that junk is, in order for it to form spheroids,lol; I think it would have had to have been molten and then fall long enough to solidify, or fall into a liquid while still molten. I just can't imagine how that could have occurred inside the engine.