San mai steel

You'll understand that San Mai steel is a three-layer composite blade combining a hard edge with flexible, tough sides for superior performance.

You'll learn how each layer—hard edge, soft spine, and backing—serves a specific purpose to balance sharpness, durability, and impact resistance.

You'll grasp the fundamentals of heating and bonding three steel types into one cohesive blade through traditional forge-welding techniques.

You'll recognize how selective cooling creates the visible hamon line and gives San Mai blades their signature hardness gradient and aesthetic beauty.