What is a “CU Mai” Blade?
E N L I G H T E N – What is a “CU Mai” Blade?
Dan Lewis calls his steel this because CU is the abbreviation for Copper and the sandwiched construction is similar to San Mai. Dan’s “CU Mai” blades are very distinctive! When Les first saw this unique combination of Carbon Steel/Copper/Damascus, he was immediately drawn to his work. These “CU Mai” blades have 5 layers: The core is W-2 Carbon Steel. On either side of the core is a layer of Copper. The final two outside layers are Damascus, combining 1095 High-Carbon Steel and 15N25 Pure Nickel.
Copper looks great, but it doesn’t belong on the cutting edge so Dan always uses a high-carbon core for strength and sharpness. Because of the melting point of Copper, the layers are brazed together, which is a technique where metal parts are fused together. In the case of Copper this is around 1600 degrees. A more common way to create Damascus billets is through forge welding, but this is done at a much higher temperature; therefore, utilizing this method would melt the Copper.
Precision & careful grinding are everything according to Dan. The billet must be measured exactly to keep a consistent core of high-carbon steel, with even layers of Damascus and Copper on either side. When it comes to etching, combining Pure Nickel and Copper allows him to use a stronger, proprietary acid. The result is a deep, dark etch in just seconds — creating a bold finish that highlights every layer.
RCC just received two hunting knives with “CU Mai” blades from ABS Journeyman Smith, Dan Lewis. Take a look…
Dan Lewis Forged CU Mai Clip Point Hunter
Dan Lewis Forged CU Mai Drop Point Hunting Knife with Desert Ironwood
What is San Mai? Learn more from our RCC Channel YouTube Video.
Click to see our Dan Lewis YouTube Video.