A dive knife is an essential part of dive safety and not a weapon. Dive knives come in a wide variety of materials, styles and sizes. In selecting a dive knife, you should consider the following factors:
Stainless steel dive knives typically cost less than titanium dive knives and are generally suitable for most recreational diving environments. Stainless steel dive knives are typically made from either 300-series stainless steel, such as 304 SS, or 400-series stainless steel, such as 420 SS. In general, 300-series stainless steel is more corrosion-resistant than 400-series stainless steel, but is softer and will require more frequent sharpening. 400-series stainless steel is harder and will stay sharp longer, but is more susceptible to corrosion and will need to be cleaned thoroughly after diving in salt water.
Titanium dive knives are lightweight, strong and highly corrosion-resistant, making them perfect for diving. Although titanium dive knives typically cost more than comparable stainless steel dive knives, they require little maintenance and stay sharp much longer
