Finned Tubular Heaters – Sheath Materials

Incoloy 840

Nickel 18-20%, Chromium 18-22%, Iron balance.

Has about 10% less nickel than Incoloy 800. Used in many air heating applications, where it has exhibited superior oxidation resistance at less cost than Incoloy 800.

Incoloy 800

Nickel 30-35%, Chromium 19-23%, Iron balance.

The high nickel content of this alloy contributes to its resistance to scaling and corrosion. Used in air heating and immersion
heating of potable water and other liquids.

316/316L Stainless Steel

Chromium 16-18%, Nickel 11-14%, Iron balance.
(316L – Low Carbon)

Modified with the addition of Molybdenum (2-3%) to improve corrosion resistance in certain environments, especially those which would tend to cause pitting due to the presence of chlorides. Applications include deionized water.

Maximum Sheath Temperature: 1200°F / 649°C

304/304L Stainless Steel

Chromium 18-20%, Nickel 8-11%, Iron balance.
(304L – Low Carbon)

Used in the food industry, medical, and chemical heating.

Maximum Sheath Temperature: 1200°F (649°C)

Steel

Low Carbon

Used for high to low viscosity oils, asphalt, tar, wax, molten salt, heat transfer liquid media and other compatible solutions.