Monel 400 is a kind of corrosion resistant alloy with the largest dosage, the most extensive use and the best comprehensive performance.This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas medium and good corrosion resistance to hot concentrated alkali liquor.It is also resistant to corrosion of neutral solutions, water, sea water, atmosphere and organic compounds.One of the important characteristicsof the alloy is that it generally does not produce stress corrosion cracks and has good cutting performance.
Hastelloy C276 is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures.
This nickel alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone,thus making it suitable for most chemical process application in an as welded condition.Although there are several variations of the Hastelloy nickel alloy, Hastelloy C-276 is by far the most widely used.