How do I care for a 1065 carbon steel katana for long-term display?
Updated Feb 2026
Caring for a 1065 carbon steel katana follows the standard high-carbon steel maintenance protocol, with the elevated carbon content making consistent care particularly important. High-carbon steel at the 1065 grade is more reactive to moisture and humidity than lower-carbon grades, meaning oxidation can develop more quickly if the blade is left without oil protection after handling. After every contact with the blade, wipe the full surface with a soft lint-free cloth to remove fingerprints and any atmospheric moisture. Apply a thin protective coat of camellia oil or mineral oil to the complete blade surface and buff away excess, leaving only a very fine protective film. For pieces with natural hamon, apply the oil with particular care along the hamon zone to ensure the full temper line surface is protected. For the natural wood scabbard, keep dry and away from humidity extremes that can cause warping. Store in a stable-temperature, low-humidity environment away from direct sunlight, which can both discolor the wood scabbard and create humidity fluctuations that stress the blade.