I am going too add my 2 cents here.
I can't tell you what steels will harden but I was taught that different metals like different quench speeds. Oil is slow and brine is fast leaving water in the middle.
We hardened a chisel that we first had to forge out without cracking it by cold forging. (Throw it on the floor, listen for the ring)
Then we heated it until a magnet would not stick to it (1350F?) at which point it was dropped into water. It was extremely hard at this point (was told it could crack) and we ran to the other side of the shop and ground a bright place on the side of the chisel end.
It was then tempered by laying handle first at the edge of the forge to let the heat soak in from that end so that it (the handle end) would be softer. When the bright spot got to a straw color it was quenched again. (I think it was light straw.)
If you do it right it will be hard. I got a good grade but was docked a few points for the length dimension being off slightly. He was a stickler for accuracy.
Yes I think there are quicker ways but this did work.