When it comes to finding a thermocouple protection tube material to withstand aggressive environments or high stress at elevated temperatures, turn to HAYNES® alloys for the long-term performance that means a cost-effective solution. A full range of alloys is available to solve those problems which force stainless steels, nickel-chromium alloys, and iron-nickel-chromium alloys into an “early retirement”. Whether the application is in a chemical waste incinerator, a forging furnace, a brick kiln or a gas turbine - there’s a HAYNES® alloy suited to the application. Look to 214®, 230®, or 556® alloys for all your T/C tube needs.
Stress Rupture 1800°F/2.0 ksi
(980°C / 14 MPa)
Stress Rupture Life (Hours)
1800°F (980°C) Sulfidation Resistance
Average Metal Affected, µm*
215 hour exposures in H2S-bearing reducing environment test gas at 1800°F (980°C).
*Wastage + internal attack.
HAYNES® 230® alloy combines excellent high-temperature strength, outstanding resistance to oxidizing environments up to 2100°F (1150°C) for prolonged exposures, premier resistance to nitriding environments, and excellent long-term thermal stability. It is readily fabricated and formed. Other attractive features include lower thermal expansion characteristics than most high-temperature alloys, and a pronounced resistance to grain coarsening with prolonged exposure to high-temperatures.
HAYNES® 556® alloy combines effective resistance to sulfidizing, carburizing and chlorine-bearing environments at high temperatures with good oxidation resistance, fabricability, and excellent high-temperature strength. It has also been found to resist corrosion by molten chloride salts, moltenzinc, and other aggressive environments.
HAYNES® 214® alloy is the most oxidation-resistant, carburization-resistant, and chlorination-resistant alloy available as a fabricable material. Its effective use temperature limit is in excess of 2200°F (1204°C) for prolonged exposure, and up to 2400°F (1316°C) for shorter exposures.