One point I forgot to mention. When you quench them drop a peice of hot metal in to heat the oil up first. When you quench you blade submerge it either point first or edge first. DO NOT lay it in the oil flat, this will cause the blade to warp. Do not move the peice from side ti side while it cools or it can warp as well. Once the hissing and sizzling stops check the blade, if there is some minor warping you can hammer it flat while it is still warm.