SLD semi-stainless steel was originally designed by Hitachi for cutting other steels. It holds an edge as long as carbon steel but is much easier to care for. SLD isn't completely stainless and should be dried completely after use to avoid staining and rusting.

440C steel is a high-carbon stainless steel that is often used in the production of cutlery, knives, and other cutting tools. It has a high corrosion resistance, wearresistance, and strength. It is also one of the most durable steels available.