TTI - Salt Bath Tufftriding

TTI Group Heat Treatment & Surface Treatment

Surface Engineering and Heat Treatment Specialists

Tufftride® QPQ®

Available at:

LETCHWORTH

Commonly

Treated

Materials

Low alloy steels

1.2344 (H13)

Head Office: TTI Group Ltd, 39-43 Bilton Way, Luton, Bedfordshire, LU1 1UU, UK

Tel: 01582 544600 Fax: 01582 488394

Tufftride®

The Tufftride? process of Durferrit is a 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. 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

QPQ®

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 the TTI Letchworth site for further detail on Tufftriding.