Stainless steel is an alloy of combined iron, carbon, and chromium. It contains at least 10.5% chromium (Cr) by weight. Some stainless steels contain up to 20% chromium. Chromium is the element that makes stainless steel rust- and corrosion-resistant.
DLC blades are cutting tools that feature a thin layer of Diamond-Like Carbon coating applied to the blade's surface. DLC is a type of amorphous carbon that exhibits properties similar to those of natural diamond.
Multilayer coatings are used in a wide range of applications and can provide enhanced performance characteristics, such as improved wear resistance, reduced friction, and enhanced corrosion protection.
Among the various coating options for industrial blades available, tin (Sn) coatings have emerged as a popular choice, particularly for tungsten carbide blades used in plotter and cutter machines. Here are some of the advantages of using a tin coating on industrial blades.
The answer to that question depends on the benefit(s) you are looking for. If you are looking for extended blade life/reduction of change over time, or reduction of friction, a coating, or even a double coating could very well be worthwhile
Tungsten carbide is the hardest metal there is and it has a comparatively smooth surface compared to other metals. Both characteristics help provide a longer life of the blade.