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I ended up forging some 5160 and some W2. It's a fact the 5160 will sizzle as it leaves the steel, very effective sparks.
It seems anything with Carbon will spark as long as it is properly...

OK!! I am really forging a piece of high carbon tool steel to use with flint, and other rocks that will help throw sparks. I would like to make something with a sharp enough edge to throw sparks off...

W1 or W2 is usually what they use in old files. That ought to work pretty good. Very high carbon

I am currently working on a project to forge my own fire steels.
I recently cut a piece of 5160 and hardened it for a fire steel and bow drill. However it didn't throw the kind of sparks I thought...