QPQ may refer to:
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Quid pro quo
Quid pro quo ('what for what' in Latin) is a Latin phrase used in English to mean an exchange of goods or services, in which one transfer is contingent upon the other; "a favor for a favor". Phrases with similar meanings include: "give and take", ...
, Latin phrase meaning something for something
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Quench polish quench 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. Three steps are involved: nitrocarburize ("quench"), ...
(QPQ), a process for hardening steel
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