I've made my living with steel for 48 years and have no idea what "pig iron" is. I suspect it is a slang term.
Even our CM rifles have pig iron in them--AKA carbon steel. It's a common term for the pellets that most steel and it's alloys start with.
Wrong.
"Pig iron is an intermediate product of the iron industry, also known as crude iron, which is obtained by smelting iron ore in a blast furnace. Pig iron has a very high carbon content, typically 3.8–4.7%,[1] along with silica and other constituents of dross, which makes it very brittle and not useful directly as a material except for limited applications."
