Products

Radiant tubes

For indirect gas-fired heating in controlled atmosphere furnaces

Long service life in demanding furnace atmospheres

Radiant tubes are exposed to corrosive furnace atmospheres at high temperatures. Depending on the service temperature and furnace atmosphere, different heat-resistant materials are selected.

Thermalloys supplies radiant tubes in the following alloy grades:

Kanthal APM / APMT — FeCrAl alloys with the highest oxidation resistance among commercial alloys. Suitable for most atmospheres except cracked ammonia. Used as flame tubes and inner tubes in recuperative burner radiant tube configurations.
25Cr20Ni (AISI 310), 253MA (S30815) — austenitic FeCrNi alloys performing well in oxidizing environments.
Alloy 800HT, Alloy 600 — nickel-base alloys suitable for nitriding atmospheres (cracked ammonia).

Material selection depends on the service temperature, atmosphere composition, and cost. Standard dimensions range from OD 79×3 mm to OD 248×5 mm. Custom sizes are available on request.

Design assistance available

We can advise on material selection and supply radiant tubes to your exact specification.