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Sauer Danfoss series 90, overheating aftermath
Sauer Danfoss Multi-Function Valves
Almost gun-like finish
Deep black finish
    Gunsmiths have used bluing  for decades to give steel barrels that cool looking dark finish. Nowadays, many different types of cold and hot bluing techniques exist on the market. Some of them can be performed at home using one of  those "do-it-yourself" kits, and some require special equipment and a professional gunsmith to be applied.

    It appears that oil hydraulics can also make a contribution to this proud craft! On these pictures you can see parts of a Sauer Danfoss series 90 closed loop pump. The peculiarity here is the gorgeous black finish ALL the internal metal parts got as a result of extreme overheating and some weird reaction with the hydraulic fluid. Unfortunately, I have no information about the type of oil used in this particular hydraulic system, but I can tell you that the black coating is very uniform and very resistant to abrasion.

   I believe this bluing technique falls under the category of "requiring special sophisticated equipment" ones...