Inconel 686

Description:

INCONEL alloy 686 (UNS N06686 / W.Nr. 2.4606) is a single-phase, austenitic Ni-Cr-Mo-W alloy offering outstanding corrosion-resistance in a range of severe environments. Its high nickel (Ni) and molybdenum (Mo) provide good resistance in reducing conditions, and high chromium (Cr) offers resistance to oxidizing media. Molybdenum (Mo) and tungsten (W) aid resistance to localized corrosion such as pitting. Iron (Fe) is closely controlled to enhance properties. Low carbon (C) helps minimize grain boundary precipitation to maintain corrosion-resistance in the heat-affected zones of welded joints. Resistance to general, pitting and crevice corrosion increases with the alloying (Cr+Mo+W) content, and INCONEL alloy 686 scores higher than competitive materials.

INCONEL alloy 686 is used for resistance to aggressive media in chemical processing, pollution control, pulp and paper manufacture, and waste management applications.

Corrosion Resistance

INCONEL alloy 686 offers outstanding resistance to general corrosion, to stress-corrosion cracking, and to pitting and crevice corrosion. Its resistance to intergranular precipitation during welding maintains its corrosion-resistance in the heat-affect zones of welded joints.

It offers resistance to both reducing and oxidizing acids and to mixed acid solutions. It is especially suited to handling mixed acids containing high concentrations of halides. It has shown good resistance to mixed acid media with pH levels of 1 or less, and chloride levels of over 100,000 ppm.

Characteristics

Excellent resistance to chloride pitting and crevice corrosion cracking

Immune to Chloride ion stress corrosion Maintains

high strength at elevated temperatures

Resistant to sea water, in both flowing and stagnant condition

Heat resistant

Applications:

Marine engineering

Furnaces & gas turbines

Chemical processing plants

Boiler & pressure vessels

Nuclear power plants

Specification of Inconel 686 Nickel Alloy

Chemical Compositions

Mechanical Properties (Minimum value at 20℃)

Product Forms and Standards