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Thermowell Material Guide (cont.)

Industry	Application	Conditions	Material
Food	Baking Ovens Char Retort, Sugar Vegetables and Fruit	400-900 °F 500-700 °F 200-300 °F	Wrought Iron – Bare Thermocouple Wrought Iron 304 Stainless Steel
Gas	Producer gas Water gas carburetor superheater Tar stills		28% Chrome Iron – Inconel 601 Inconel 600 – 28% Chrome Iron Inconel 600 – 28% Chrome Iron C1018 Steel
Glass	Melting tank roof & wall flues and checkers Forehearth and feeder Lehr Open Hearth Roof	to 2400 °F to 1800 °F to 2200 °F 300-500 °F	C30 Ceramic Inconel 600 – 28% Chrome Iron – Wrought Iron Bare Platinum Thremocouple Wrought Iron LT-1
Heat Treatine	Annealing Hardening open fired or electric heated H. S. Tool Steel Salt Baths Neutral High Speed Lead Pot Cyanide Pot Lavite Pot Carburizing gas cyanide pot Nitriding Quench Oil	to 1200 °F 1300-2000 °F to 1500 °F to 2000 °F to 2400 °F to 2350 °F to 2000 °F to 2350 °F to 2000 °F 1750 °F 2350 °F 2400 °F to 2000 °F to 1000 °F 900 °F	Wrought Iron Inconel 600 – Inconel 601 – 28% Chrome Iron (for sulphur atmospheres) Wrought Iron Inconel 600 – 28% Chrome Iron C30 Ceramic Inconel 600 – Nickel 28% Chrome Iron C30 Ceramic 28% Chrome Iron Inconel 600 – Nickel Nickel Inconel 600 – 28% Chrome Iron Inconel 601 – 28% Chrome Iron Nickel 28% Chrome Iron Wrought Iron
Iron and Steel	Blast Furnace down comer stove dome stock trunk stove outlet flue hot blast main Open Hearth flues and stack checkers Waste Head Boilers Soaking Pits Billet and Slab Furnace Forging Furnace Annealing Bright Annealing batch continuous Pickling Galvanizing Tinning tin pot palm oil Vacuum Melting (Induction Melting)	1800-2300 °F 900-1600 °F to 1800 °F to 2200 °F to 1600 °F 2000 °F Over 2000 °F 2000 °F Over 2000 °F 2000-2400 °F to 3200 °F	Inconel 601 – 28% Chrome Iron – Silicon Carbide – Silicon Nitride Silicon Carbide – Silicon Nitride Inconel 600 Wrought Iron Inconel 601 – 28% Chrome Iron Inconel 601 – 28% Chrome Iron – LT-1 Inconel 601 – LT-1 Inconel 601 – 28% Chrome Iron Inconel 601 – 28% Chrome Iron – Silicon Carbide – Silicon Nitride Silicon Carbide – C30 Ceramic – Silicon Nitride Inconel 601 – 28% Chrome Iron Silicon Carbide – C30 Ceramic – Silicon Nitride Silicon Carbide – C30 Ceramic – Silicon Nitride Inconel 600 – Inconel 601 or 28% Chrome Iron (for sulphur atmospheres) Inconel 600 C30 Ceramic – Silicon Carbide – Silicon Nitride Lead Sheath – Silicon Carbide – Silicon Nitride XH Seamless Steel – Silicon Carbide – Silicon Nitride Seamless Steel – 28% Chrome Iron – Silicon Carbide – Silicon Nitride 304 Stainless Steel C98 Ceramic
Non-Ferrous Metals	Aluminum melting pot pouring ladles furnaces heat treating die casting Magnesium melt die casting ladle Lead pots	1300 to 1400 °F 950 °F 800-1300 °F 1000 °F 1500 °F	Cast Iron (Washed) – Silicon Carbide – Silicon Nitride Open end thermocouple assemblies 304 Stainless Steel Cerampak Wrought Iron – 304 Stainless Steel Cerampak Cast Iron – Wrought Iron – Silicon Carbide Wrought Iron Wrought Iron Wrought Iron Wrought Iron 28% Chrome Iron – Silicon Carbide – Silicon Nitride