Heat Treatments

Heat treatment can improve the performance of metal seals. It will increase the yield strength of the material having its positive impact on seating load and spring back. The increased seating load will press the soft plating into the surface irregularities better, thereby creating a better leak tightness. The higher spring back means that the intimate contact between the seal and the mating surface is maintained longer in case of flange deflection and flange lift-off. In some cases heat treatment can be used to improve the seal’s resistance to fatigue under cyclic loads. Depending on the application Sealco’s partners HTMS offers age hardening, annealing and solution and precipitation heat treatment.

Sealco’s partners HTMS recommends heat treating all non-Spring Energised Metal C-Rings. However, heat treatment is mostly not required for Metal O-Rings and Spring Energised C-Rings. Nevertheless, some demanding applications in Oil and Gas environment do require heat treatment to prevent material embrittlement. (NACE-compliant)

Material CodeHT-1HT-2HT-3HT-4HT-5HT-6HT-7
1Alloy X-750 / Inconel® X-750xxx
2Alloy 718 / Inconel® 718xxxx
3SS 321x
4Alloy 600 / Inconel® 600xx
5SS 304 Lx
6SS 304 high tensilex
7SS 316 Tix
9SS 302x
AElgiloy® / Phynoxxx
BHaynes 214xx
CAluminum 1050xx
DAlloy 625 / Inconel® 625xxxx
ENimonic 90xx
FHastelloy C-276xx
GHaynes 188xx
HAluminum 6060xx
ITantalumx
JAlloy A-286x