Inconel 600
Inconel 600 offers outstanding mechanical properties and
high strength and supreme workability.
It adequately performs up to 1200oF. Inconel 600 resists corrosion in
fresh waters, including the highly corrosive natural waters comprising of free
carbon dioxide, iron compounds and dissolved air. It remains free from stress corrosion
cracking in fact in boiling magnesium chloride.
Alloy 600 offers supreme resistance to sulfuric acid in the
oxidizing conditions than Nickel 200 or Monel 400. Inclusion of oxidizing salts
to sulfuric acid passivates Inconel 600 that makes it fit for use with acid
mine waters where Monel 400 cannot be
used.
Inconel 600 is not susceptible to stress corrosion cracking
in the chloride salts and has supreme resistance to the nonoxidizing halides.
It offers outstanding resistance to dry halogens at high temperatures and is
used successfully in the chlorination plants up to 1000oF. This alloy replaces
Nickel 201 in specifically high temperature applications where sulfur offers
enhanced resistance.
Incoloy 800
It is basically used for oxidation resistance and strength
at high temperatures. Alloy 800 is used in high temperature equipments because
it does not develop the embrittling delta phase after long exposures up to
1600oF. It offers high creep and rupture strengths that add in its functionality
in the numerous applications.
At moderate temperatures the general corrosion resistance of
Incoloy 800 is similar to other austenitic nickel-iron-chromium alloys. With
increase in temperature, alloy 800 attains supreme corrosion resistance whilst
other austenitic steel grades fail to perform.
Incoloy 800 offers supreme resistance to nitric acid up to
70% concentrations. Its Inconel bars resist corrosion in diverseoxidizing salts however except halide salts. It offers good resistance to
organic acids like formic, acetic and propionic acids. Incoloy 800 is specifically
fit for use in hot corrosive gases.
Incoloy 825
Alloy 825 is an enhanced version of Incoloy 800 containing
higher nickel concentration that makes it resistant to chloride ion stress
corrosion cracking. Inclusions of molybdenum and copper resists pitting in the
reducing conditions for example sulfuric or phosphoric acid. Incoloy 825
prevents corrosion in pure sulfuric acid solutions up to 40% concentrations at
boiling points. However it has limited applications in hydrochloric or
hydrofluoric acids.
Chromium concentration in Incoloy 825 resists corrosion in
diverse oxidizing conditions like nitrates, nitric acid solutions and oxidizing
salts. It resists corrosion by stress cracking in neutral chloride conditions.
For localized corrosion of stainless steel 300 series, Incoloy 825 is the best
replacement. It also prevents corrosion in seawater.
Incoloy 800H
Incoloy 800H is a controlled carbon grade of alloy 800.
Carbon concentration is maintained between 0.05% to 0.1% to offer superior high
temperature creep and stress rupture properties. It is also used in diverse
high temperature applications in the refining and heat processing plants.
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