Quench polish quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. It is sometimes known by the brand name of Tufftride, Tenifer or Melonite.[1] Three steps are involved: nitrocarburize ("quench"), polish, and post-oxidize ("quench").[2]
This process is often used when two or more of the following properties are required in a workpiece:
wear resistance
corrosion resistance
fatigue strength
Common applications of the process are for piston rods of shock absorbers, cylinders and rods for hydraulic systems, pumps, axles, spindles, firearm slides and barrels and valves.[3]
^"Melonite/QPQ". HEF Group (USA). 14 June 2012. Retrieved 16 February 2014.
^Davis, Joseph R., ed. (2002). Surface Hardening of Steels: Understanding the Basics. ASM International. pp. 203–204. ISBN 9781615032501. Retrieved 16 February 2014.
^Cite error: The named reference easterday was invoked but never defined (see the help page).
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