sheath materials

Sheath Materials-

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 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 Stainless 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 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 Stainless Steel 899°C (1650°F)
Same as 316 S.S. except low carbon version allows for better welding and fabrication.

347 Stainless 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 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.

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