Building a project out of a piece of 4140 prehard. The local custom metalcutting shop provided the steel. Problem is, it's magnetic. Not just a little magnetic, it's "you could use this thing to pick up nails, small children, and battleships" magnetic. I asked them if they have a demag ring, they don't (and were surprised but will check their stock... ok, great, but doesn't help me much at the moment).
So how do I demag this sucker? I know that heat would do it, but I don't want to mess up my hardening. I know mechanical impact can redue it, but I don't know if that's one of those "theoretical but not practical" things, or if it'd work. So, simple question - can I just smack the (un-machined) end of this sucker with a hammer a bunch of times and get it down to tolerable, or do I need to find someone with degaussing apparatus of some sort, or am I SOL? It's annoying, to say the least, to have every chip re-attach itself to the work, invariably on the layout lines that I'm trying to see.
Thanks, Dave Hinz