I ran across some 430 stainless steel in the scrap bin at work today, and there was just enough on the margins to cut a couple of sets of woodturning chisels, so I took the opportunity to make them.
They're all cut to shape, the flutes are pressed and they're welded to stainless ferrules, so they're almost ready to go- but they are annealed for sheet work, so they're obviously going to need some hardening.
Basically what I know, or at least can guess at, is that I need to heat them past critical, then quench in *something*, give them a little polishing to remove any scale and then reheat to temper some of the brittleness out. None of that should be a problem with the forge I've got set up, but I want to make sure to get it right- as high(ish) carbon stainless is pretty hard to come by in the shop I work at.
So, what I'm looking for is a ballpark on the temp I need to heat these to, what I should quench them in (water and brine are immediately availible, and motor oil is obviously easy enough to come by- unfortunately, another guy is waiting on one of the sets, so I really don't have a lot of time to mail order any special qunching oil unless it is *absolutely* required) Is this project going to want a slow dip in the quenching fluid, point first, or a full immersion very quickly and all at once? I am also wondering how hot they need to be for how long to temper them. There are eight of the suckers, so an ideal situation would be if I could perhaps temper them in the (kitchen) oven on the regular racks.
The parts are 14" long from ferrule end to chisel tip, with 13" flutes. The flute material is .114" thick, and has a 2A finish, if that matters. The blanks were laser cut from sheet stock that is known to be resistant to warping under welding heat. Their intended application is to shear spinning wood with a tool rest supporting the flute about 1/4" to 3/4" from the cutting edge. The most important thing for me is to get the keenest edge I can out of these without them being so brittle that they crack under normal usage. (I know 440 would have been better, but this was free and redily availible, so it's worth a try!)
Thanks for any advice you might have!