Heat treat and temper the blade.
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Most of the blades have a Rockwell hardness of 35 so they will need to be heat treated and tempered to hold an edge. Most industrial grade blades are hard enough and do not need to be treated (but if it is too hard, it will not sharpen easily).- Run a large stove burner on high. This is not hot enough to get the blade to around 1500F, so use a MAPP gas torch and the burner together. That will take it to a non-magnetic state. Note that the temperatures needed to temper will vary based on the metal. L6 (sawblades), L7 ( large sawmill blades) and tool steel type O-1 are probably the easiest for beginners.
- Once it gets hot enough for the magnet not to stick, hold the temp for a minute to make sure it will be an even heat treat. There's no picture of this being done because it is hard to hold a camera, a torch and pliers with a magnet.
- Quench in vegetable oil that is about 130F for 1 minute. Do not quench in the house with metal any thicker than a saw blade. Thicker metal retains more heat and will make a large plume of smoke and possibly ignite and boil over the oil. Instead, keep it hot with your torch while you go outside to quench it.
- Wipe the oil off the blade and throw it in the oven at 525F for one hour. Do yourself a favor and lay it on some aluminum foil first, that way there are no knife shapes burned into the wife's favorite cookie sheet. It will come out black and a little flaky but some 120 grit sandpaper will take care of that. If you don't wipe it down, the oil congeals on the blade and forms a very sticky mess that is a pain to get off.
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