ORDER CODE

SHEATH MATERIAL

MAXIMUM TEMPERATURE

(Continuous Service in Air)

NOTES

304

304 Stainless Steel

899°C

1650°F

Most commonly used in low temperature sheath material. Good corrosion resistance. Subject to damaging carbide precipitation in 900°F to 1600°F range.

304L

304 Low Carbon Stainless Steel

899°C

1650°F

Low carbon version of 304 S.S. Low carbon content allows this material to be welded and heated in the 900°F to 1600°F range without damage to corrosion resistance.

310

310 Low Carbon Steel

1149°C

2100°F

Mechanical and corrosion resistance similar to but better than 304 S.S. Very good heat resistance. This alloy contains 25% Cr., 20% Ni. Not as ductile as 304 S.S.

316

316 Stainless Steel

899°C

1650°F

Best corrosion resistance of the austenetic stainless steel grades. Good corrosion resistance in Hydrogen Sulfide. Subject to damaging carbide precipitation in the 900°F to 1600°F range.

316L

316L Low Carbon Stainless Steel

899°C

1650°F

Same as 316 S.S. except low carbon version allows for better welding and fabrication.

347

347 Steel

871°C

1600°F

Similar to 304 except nickel columbium stabilized. Designed to overcome susceptibility to carbide precipitation in the 900°F to 1600°F range.

446

446 Stainless Steel

1149°C

2100°F

Ferritic stainless steel which has good resistance to sulfurous atmospheres at high temperatures. Good corrosion resistance to nitric acid, sulfuric acid and most alkalies. 27% chromium content gives this alloy the highest heat resistance of any ferritic stainless steel.

INC

Inconel 600

1177°C

2150°F

Most widely used thermocouple sheath material. Good high temperature strength, corrosion resistance, resistance to chloride-ion stress corrosion cracking and oxidation resistance to high temperatures. Do not use in sulfer bearing environments. Good in nitriding environments.

INC625

Inconel 625

982°C

1800°F

Excellent high temperature strength. Excellent resistance to pitting and crevice corrosion. Unaffected by radiation embrittlement.

MOL

Molybdenum

399°C (in Air)

750°F (in Air)

Refractory metal. Brittle, cannot be bent. Use only in inert, vacuum or reducing atmospheres. Most commonly used in BeO insulation and Tungsten Rhenium conductors. Un-compacted assemblies only.

T1

Titanium

427°C

800°F

Lightweight, excellent strength in the 300°F to 800°F temperature range. Excellent resistance to oxidizing acids such as nitric or chromic. Resistant to inorganic chloride solutions, chlorinated organic compounds and most chlorine gas. Resistant to salt water spray and sea water.

MO

Monel 400

538°C

1000°F

1000°F maximum in oxidizing conditions. Nickel-copper alloy with good corrosion resistance. Excellent resistance to sea water, hydrochloric acid and most alkalies.

HAB

Hastelloy B-2

538°C (oxidizing)

1000°F (oxidizing)

816°C (reducing or vacuum)

1500°F (reducing or vacuum)

Excellent resistance to hydrochloric acid at all concentrations and temperatures. Also resistant to hydrogen chloride, sulfuirc, acetic, and phosphoric acid.

HAC

Hastelloy C-276

1093°C

2000°F

Excellent corrosion resistance, especially in chlorinated environments. Resistant to ferric and cupic chlorides, solvents, chlorine, formic acids, acetic acids, brine wet chlorine gas and hypochlorite.

CU

Copper OFHC

204°C

400°F

Excellent thermal conductivity. Used in special applications for research and low temperature applications.

TA

Tantalum

482°C (Air)

900°F (Air)

Refractory metal. Very ductile. Use only in inert or very good vacuums. Most commonly used with BeO and Tungsten Rhenium conductors. Do not use in environments containing nitrogen above 700°F.

AL

Aluminum (1100)

316°C

600°F

Commercially pure aluminum. Used in special applications requiring good thermal conductivity.

AL20

Alloy 20

982°C

1800°F

Generic version of Carpenter 20CB-3 developed specially for resistance to sulfuric acid.