I usually use small worn out files for making little chisels.
Sometimes short lengths of drill-rod too. When using the latter they are usually just unkn types from the scrap can (water hardening, oil hardening??).
So to harden them on the first attempt I use the old method of a can of water with and oil slick on the surface. Seems not to matter the type of oil, unless I'm just luck. But I just use a few drops of motor oil from the 'oil quench' can.
You still don't get to know which type steel it is, but at least it hardens for you. Then just draw them back to where you want them to be.
