Do not use a wood saw blade, a torch, or a hammer and chisel on thick cast iron. Just don’t. You’ll end up with sparks, broken tools, and a project that needs swearing at. Also, avoid cutting wet cast iron—water can cause micro-fractures when the metal heats up. Dry is your friend.
The Best Way To Cut Cast Iron Pipe? – RPZGIY
And never, ever put your face directly over the cut line. That dust cloud? It’s basically iron-powder glitter, and nobody wants glitter in their eyebrows.