Heat treatment, plating and coating of seals
A
HTMS product story
Edited by the Engineeringtalk editorial team
Sep 28, 2009
HTMS in-house platings or coatings can be applied to improve the sealing performance of the company's metal seals.
Its resilient metal seals are designed to provide the required tightness when subjected to extreme temperature, pressure and media.
HTMS in-house platings or coatings are applied to improve the sealing performance of metal seals.
The seals are produced from stainless steel or high-temperature alloy tubing, strip and wire.
Depending on the required tightness, the selected seal, the media to be sealed and the condition of the mating surface, a softer or harder plating or coating can be chosen.
When temperature allows, either PTFE coating or soft silver should be applied.
The soft layer, flows at seal compression into the mating surface irregularities and creates the best seal performance possible.
HTMS suggests to heat treat all non-spring-energised metal C rings.
High-performance metal seals will perform better in the heat-treated condition.
Heat treatment of super alloys such as Inconel X750, Inconel 718 and Haynes 214, will increase the yield strength of the material.
This influences the seal's performance, because of increased seating load and a better spring back.
The increased seating load will press the soft plating more effectively into the surface irregularities, thus creating a better seal.
The higher spring back means that the intimate contact between the seal and the mating surface is maintained longer in case of flange deflection.
This can be a result of high temperatures, high pressures or a combination of both.
Heat treatment is mostly not required for spring-energised C rings and metal O rings.
Some demanding applications in oil and gas environments do require heat treatment to prevent material embrittlement.
Annealing and heat treatment also improves a seal's resistance against fatigue under cyclic loads.
HTMS offers age hardening, annealing, and solution and precipitation heat treatment.
Metal O rings and and some spring-energised C rings made from austenitic stainless steels are not precipitation-hardenable.
These seals can only be supplied in the work-hardened condition.
For demanding applications and for temperatures of more than 400C, HTMS advises the use of high-alloy steels.
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Contact HTMS
Tel +32 (0)15220281
Other HTMS stories
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Resilient metal seals can take the heat
High Tec Metal Seals (HTMS) designs and manufactures elastic and resilient metal seals for applications with extremes of temperature and pressure. -
Selecting the right resilient metal seal
HTMS offers a seal selection guide to help customers pick the right seal for their needs. -
Seals cope with harsh environments
Unlike flat gaskets, HTMS resilient metal seals have a defined spring back in a wide temperature range.
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