Protection Tube Material

Material Operating Temp(˚C) Features
304 S.S. 980 Widely used as a common protection tube against heat and corrosion but not recommended for use in the presence of sulphur or reducing flame. Subject to stress and “pit” corrosion.
321 S.S. 980 Higher corrosion resistance than 304 S.S. because of its Ti content to prevent carbon preticiopation. Excellent resistance to grain boundary corrosion after welding due to less carbon preticipation.
316 S.S. 980 Contains Mo and has excellent resistance to corrosives, heat, acids and alkalis.
316L S.S. 980 Less carbon content than 316 S.S. and has beeter resistance to grain boundary corrosion, Resistant “pit” corrosion.
310S S.S. 1,000 High Ni-Cr content and good high temperature strength with resistance to oxidation at high temperatures. High mechanical strength.
446 S.S. 980 Excellent resistance to oxidizing and reducing flames. Containing sulphur. Suitable for use in non-ferrous molten metals and other high temperature applications, but less mechanical strength.
Inconel 600 1,050 Excellent resistance to oxidizing and reducing atmospheres at high temperatures. But sulphurous atmospheres should be avoided. Immune to stress and “pit” corrosion.
Incoloy 800 870 Excellent to high temperature oxidizing atmospheres and thermal shock. About 10 times longer service life than 304 S.S. against high temperature corrosion.
C – 276
1,000 Excellent resistance to high temperature oxidizing and reducing atmospheres and also to Cl4 gases.
Titanium Oxi. 250
Red. 1,000
Superior corrosion rsitance in cryogenic temperatures but at high temperatures easily oxidized and becomes brittle.
Monel Oxi. 500
Red. 600
Excellent resistance to water vapor and sea water at high pressure and corrosion.
Tantalum Oxi. 300
Red. 2,200
Excellent heat-resistant material with high resistance to all acids apt to severe oxidation and embrittlement in air at high temperature.