09/02/2026
Making a Wakizashi Part Two, the SHORT version
From short shaped steel to hardened, tempered and polished blade. With bonus fire!
The steel for the blade was made from a billet of 26C3 with an outer cladding of wrought iron, a technique called san-mai. These metal are reasonable substitutes for the Japanese steels found in a san-mai Wakizashi, which are not reasonably available in Canada.
Claying the blade is a Japanese technique that results in a differential heat treat, where the back of the blade comes out soft and the edge comes out very hard. The lines crossing the edge help introduce areas of hard and slight less hard that will theoretically limit any potential cracks from propagating.
The normalizing cycles refine the grain structure of the blade prior to quench, help dry out the clay and also remove and stress from forging and grinding. Surprisingly, it also caused the clay to bubble up unexpectedly!
Quenching the blade in Parks 50 Fast oil is a safer alternative to the water quenching necessary to produce a very hard edge and also introduces the curve into the blade. Quenching in Parks 50 turns to be very flammable, far more dramatic than my usual Canola oil and far more than water!
Tempering the blade reduced some of the hardness while greatly increased the toughness, making the blade able to hold a good edge while not being brittle. It also allowed for some straightening. 2-3 cycles of 2hrs are ideal. Testing after tempering produced a hardness of 58 HRC, which will make a very sharp edge.
After that it's all machine grinding and then hand sanding. While you can machine grind to 320 or with some setups 600, it comes with more risk of overheating the edge, destroying the temper and messing up the bevels, hence I started at 220 and ended at 1000 grit. A little bit of buffing and it produced a mirror-finish that makes the separation between the steels just visible.
Next steps are to produce the fittings and then assemble and test the blade.