Simple Heat Treating for a High Carbon Steel Knife Blade – Part 1, by Steve A.
Modern civilization owes its existence in part to the early discovery that iron containing small amounts of carbon could be made much harder than other iron compounds. This substance, iron with between about 0.6 and 1.7 percent carbon and no other alloying elements, was the first predictably hardenable steel and can be referred to as “high carbon plain steel”. Such steels can be made as hard as a file and form the most basic group of tool steels, where tool steel is defined as steel that is able to cut softer steel. The range of these steels include the simple …