QPQ & Tufftride®

The Tufftride® process of Durferrit is a surface heat treatment Salt Bath Nitrocarburising treatment carried out at around 580°C for relatively short times (30 minutes to 3 hours) which produces a hard wear resistant surface on many steels. In this type of surface heat treatment It is common to oxidise the surface compound layer formed, by using the oxidising AB1 salt bath. Corrosion resistance of the steel is enhanced by formation of this surface layer in a similar way to many other Nitrocarburising treatments. Fatigue strength and indentation resistance is superior to untreated steel due to a diffusion layer beneath the compound layer. The depth of this diffusion layer depends on time of the Tufftride® treatment and the type of steel being treated.
This treatment is used as an alternative to chrome or nickel plating. 

Benefits of Tufftriding:
  • Increased surface hardness
  • Improved fatigue strength
  • Increase in corrosion resistance
  • Increased wear resistance
  • Reduces scuffing


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QPQ is the name given to the Quench, Polish, Quench treatment of Tufftride®. As the name implies, parts are quenched after Tufftriding, polished to restore the surface finish (surfaces are roughened during the Tufftride process) then reoxidised in the oxidising salt bath. Due to the improvement in surface finish, QPQ provides enhanced corrosion resistance over straightforward Tufftriding along with reduced friction coefficient. 

If choosing a Tufftriding treatment, consideration must be given to component geometry, particularly blind threaded holes. 

Please contact us for further details on Tufftriding.

Available At:

Commonly Treated Materials:
  • Low Alloy Steels
  • 1.2344 (H13)


 Aalberts Surface Technologies Heat Ltd | Disclaimer

Registered Address.: Aalberts Surface Technologies Heat Ltd, Blackhorse Road, Letchworth. SG6 1HD 

Tel: 01462 472147