I hope there's someone here that is well versed in chemistry because I need someone to explain to me how boronizing works. What I have found out via google is this:
Boriding (boronizing) is a thermochemical diffusion process in which hard and wear resistant boride layers are generated by diffusing boron onto the surface of material.
The treatment of the materials is carried out in a temperature range of 750 to 950°C. An essential element is the optimal distribution of heat in the furnace used in order to treat all parts of a batch evenly. During the boriding process, complex intermetallic compounds are created between the elements iron, boron, chromium, nickel, vanadium, etc. The resulting borides form a hard peripheral surface layer consisting of Fe2B and other compounds. Because of its crystalline structure, the boride layer is anchored exceptionally well to the base material.
But how exactly can boron change the properties of steel?