Boriding is a surface hardening process, in which boron atoms are diffused into the surface of steel or another metal. It gives the material higher thermal stability and wear resistance.Due to its versatility, steel is widely used all over the world for e.g. the construction of railroad tracks, bridges and modern buildings, pipelines, heavy equipment, tools and many other applications. Each application makes different demands on the steel, which is why it might be necessary to increase the usable service life using surface-hardening processes such as boriding. What is boriding?Boriding is a thermochemical surface hardening process applicable to a wide range of ferrous metals, with the exception of silicon bearing steels (e.g. nitrided steels, case hardened and stainless steels) and aluminum. Besides that, boriding can also be used on nonferrous and cermet materials, nickel- and cobalt-based alloys and molybdenum.The process of boronizing is a diffusion-based two-step reaction. First of all, a boron yielding mixture has to be present at a specific time and temperature to create a thin layer on a metal part. At second, the atoms of the dense boron layer are diffused into the surface of the metal. This results into a layer hardness of 1600 up to 2300 HV, depending on the base material. Due to the diffusion process, the boronized layer contains complex phases of metal borides that provide several benefits. Benefits of boriding.Boriding a material goes hand in hand with numerous benefits and is therefore the ideal way to harden the surface of industrial used applications made of steel and other metals and alloys. Machinery parts, tools, pumps, valves, gears, dies, steam turbines and other steel components are often subjected to heavy demands such as high temperature, pressure, corrosion, abrasion, cohesion and adhesion. Those effects show negative influences on the life expectancy and overall performance of the material.This is where the benefits of boriding can be utilized. The process of introducing boron to a metal or alloy results in a hardened surface, higher thermal stability, reduce of friction and resistance to wear, corrosion and cold welding. Therefore, boronized parts are more durable and require less maintenance then induction hardened, carburized or nitrocarburized parts. Nevertheless, boriding can easily combined with those conventional heat treatments to achieve an even better performance regarding core hardness and the deepness of wear layers.