Extremely high Vanadium carbile can be applied on steel substrate by TD PROCESS. The layer improves resistance against  wear, scuffing, oxidation ,corrosion and etc. Of steel products. Since the process was invented by Toyota Central Research and Developement Laboratories, it has been used for long period in worldwide  automobile industrie and other many field of industries.                The substrate material be immerged  into a high  temperature   salt   bath  containing    vanadium.    The  vanadium    in   sult   is to  form  VC    (vanadium carbile) with   carbon in  substrate  steel  which is diffused  to the surface of work.The principle of this process is followed by   hardening  and   tempering   in  order  to  attain   the mechanical   properties required for substrate material. This  process  can  be  applied on any substrate  steel  containing     carbon   of   0.3%    and  more.   In  case of substrate of  less than  0.3%  carbon ,  precarburizing is recommended.              Hardness   obtainable   by  this   process  will  be 3000   Vickers  Hardness ,  which  is ,  needless  to  say, harder than  any  kind of  nitrided  tool steel, high speed steel.    It  is  harder than  tunsten  carbile  coating, hard chrome plating  and  ultra  hardness  steels.   As the VC layer of this   process    ismadeby   diffusion   of  carbon   from substrate ,the layer adhered  to the substrate  work pieces and never peel out even  used in hard working.                   The VC layer also shows excellent anti corrosion characteristics. Sequence of TD Process     TD.WORKING.ZONE           Top