Hullo!
I just asked my welder friend to keep an eye out for me for a big hunk o' steel to use as a heavy beater anvil for drawing out heavy stock etc. I have a chunk, 80 lbs or so, 1 foot by 1 foot by 2.5-3 inches thick, but I think it's cast iron. When I whacked a corner the corner chipped off a bit. It has great rebound but has no ring. Reckon it'd still be okay to use it for striker-work? What could I use a chunk 1 foot by 1 foot by 3 inches of cast iron for?

thanks,
be merry,
Archie

Try a spark test, if it's CI don't hammer on it as it will break. If the top of the lump is level you could use it as a marking out plate or for clamping small work while welding; the mass will act as a heat sink and help prevent warping.