SK-5 steel is a traditional Japanese carbon steel that has historically been used to make knives and other traditional Japanese craft tools. This steel belongs to a group of carbon steels that have a higher carbon content and are known for their hardness and ability to achieve an excellent edge.The basic composition of SK-5 steel can include about 0.9-1.0% carbon. The carbon content of the steel provides high hardness, which is a key factor for blade production. This steel is generally considered to be a good choice for traditional Japanese knives as it allows for an excellent edge while being sufficiently durable. SK-5 steel is also often characterized by the fact that it can be well worked and obtain distinctive contrasts in annealing. Traditional processes, such as differential annealing (hamon), are often used to achieve specific looks and blade characteristics.
However, it is important to remember that SK-5 steel is not stainless and therefore requires proper care to prevent corrosion. Regular cleaning, drying and maintenance of the blade are essential to maintain the quality and performance of a knife made from this steel. It is worth being aware that the world of knives and their materials is diverse, and there are many other types of steels and materials suitable for different purposes. The choice depends on the personal preferences, needs and expectations of the user.