CTS-XHP is Carpenter Technology's answer to the demand for a stainless that could compete with high-carbon options on edge retention. This high-chromium, high-carbon alloy hits an unusual sweet spot — corrosion resistance comparable to 440C alongside edge holding that approaches D2 at similar hardness, and toughness that outperforms both. Sergey Rogovets built much of his reputation on CTS-XHP, and the results speak to what the steel delivers in the right hands: blades that take a fine, refined edge, hold it under use, and clean up easily. It remains a top-tier choice for custom folders where the maker won't accept the usual stainless compromises.