Thermocouple protection tubes

Thermocouple protection tubes (pyrometer protection tubes) in a wide range of high-temperature corrosion resistant materials. The Sandvik program includes materials suitable for all types of shielding gases and environments covering operating temperatures up to 1200ºC (2190ºF).

Sandvik thermocouple protection tubes are characterized by long service life and contribute to reduced maintenance costs in, for example, the metal, glass and petrochemical industries.

Prolong service life with Sandvik 353 MA

The high-performance material Sandvik 353 MA* brings particular benefits to thermocouple applications. One of our customers, who previously used tubes of Alloy 600 type, more than doubled the service life of their thermocouple protection tubes by changing to Sandvik 353 MA. In this case the tubes were used in the flue gas zone of the pre-bake area of the smelter in an aluminium plant.

Thermocouple protection tube materials (other grades can be offered on request)

Sandvik grade
(UNS)
Max. operating temp. ºC (ºF)Typical application areas
Sandvik 253 MA*
(UNS S30815)
1100ºC (2010ºF) For oxidizing and sulfidizing conditions.
Sandvik 7RE10
(UNS S31008/S31009)
1100ºC (2010ºF) For oxidizing conditions.
Sandvik 353 MA*
(UNS S35315)
1150ºC (2100ºF) For oxidizing, nitriding and carburizing conditions as well as in endothermic gas or hydrogen gas (H2).
Sandvik 4C54
(UNS S44600)
800ºC (1470ºF) For oxidizing and sulfidizing conditions as well as for hydrogen gas (H2) containing environments.
Sanicro 70
(UNS N06600)
1170ºC (2140ºF) For oxidizing, nitriding and carburizing conditions as well as for salt melts.
Sanicro 61
(UNS N06601)
1170ºC (2140ºF) For oxidizing, nitriding and carburizing conditions.
Sanicro 31HT
(UNS N08811/N08810)
1100ºC (2010ºF) For carburizing and nitriding conditions.
Kanthal APM
Kanthal APMT
1200ºC (2190ºF) For oxidizing, carburizing and sulfidizing conditions as well as for hydrogen (H2) containing environments.

*253 MA and 353 MA are trademarks owned by Outokumpu OY

Stock program

Sandvik holds stock of several commonly used grades and sizes of high-temperature tubes.

Thermocouple wire and strip

As part of its Kanthal range of heating technology products, Sandvik also provides thermocouple wire and strip.
Go to the Kanthal website