Yes, katanas are generally considered to be sturdy and well-constructed weapons. Traditional Japanese katanas were crafted using a specific sword-making technique called "tamahagane," which involved repeatedly folding and hammering layers of high-carbon steel to create a strong and flexible blade.

The design of a katana incorporates a curved, single-edged blade with a sharp cutting edge on one side and a thick spine on the other. This curvature, known as the "sori," contributes to the sword's strength and cutting ability. The shape allows for efficient slicing and reduces the risk of the blade getting stuck in the target.

Moreover, katanas were renowned for their sharpness and cutting performance. Skilled Japanese swordsmiths applied a meticulous process to create a hard, sharp edge while maintaining the sword's durability. The combination of high-quality steel and careful craftsmanship contributed to the overall sturdiness of the katana.

It is worth noting that the quality and sturdiness of katanas can vary depending on factors such as the materials used, the skill of the swordsmith, and the specific manufacturing process. Modern replicas or mass-produced katanas may not always match the quality and craftsmanship of traditional, handcrafted ones.