EXT wrote:
Malleable usually means they
were shaped by forging increasing their strength, while cast items were just
poured into a mould with no strength.

.....err, no, not exactly. Malleable Cast Iron is what the "malleable"
refers to. Different microstructure and properties than Grey Cast Iron
which is the kind you can break with a hammer.

Both start life as molten stuff poured into moulds.