Traditional samurai swords, such as the katana, were historically made from high-carbon steel, not stainless steel. The traditional construction of a katana involved using a combination of different types of steel, with a high-carbon steel edge known as the "hagane" and a softer low-carbon steel back called the "mune." This construction method provided the blade with a balance of hardness, sharpness, durability, and flexibility.

Stainless steel was not available during the time when samurai swords were being forged in their traditional form. Stainless steel is a relatively modern development in metallurgy, and its properties differ significantly from those of high-carbon steel. While stainless steel has its advantages, such as corrosion resistance, it may not possess the same performance characteristics or historical authenticity as the high-carbon steel used in traditional samurai swords.

That being said, in modern times, there are some katana-style swords made with stainless steel blades, particularly for decorative or replica purposes. These swords are often mass-produced and may not have the same level of craftsmanship or performance as traditional high-carbon steel blades.

If you are seeking an authentic samurai sword or katana, it is advisable to look for blades made from traditional high-carbon steel and crafted by skilled swordsmiths who adhere to the traditional forging techniques.