About Alloy
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
Product Form
Bar: ASTM B574
Forgings: ASTM B564
Plate, Sheet, Strip: ASTM B906, ASTM B575
Pipe, Tube: ASTM B163, ASTM B622, ASTM B829,ASTM B619, ASTM B775, ASTM B626,ASTM B751
Fitting: ASTM B366
Chemical Composition
| Composition | Ni | Cr | Fe | Mo | W | C | Mn | Si | S | Cu | Al | Ti | P | |
| Content (%) | Min. | Bal. | 19 | 15 | 3 | 0.02 | ||||||||
| Max. | 23 | 5 | 17 | 4.4 | 0.01 | 0.75 | 0.08 | 0.02 | 0.25 | 0.04 | ||||
Property
| Tensile Strength (σb/MPa) | Yield Strength (σp0.2/MPa) | Elongation (σ5/%) |
| 690 | 310 | 45 |
Application
Since these properties, our Inconel 625 nickel alloy earns wide acceptance in organic chemistry processing field where acid chloride catalyst is typically utilized, and can be used for digester and bleacher in paper industry.
Nuclear reactor-cores and control-rod components
Wire rope for cables and blades on Naval crafts such as gunboats and subs
Oceanographic equipment
Rings and tubing for environmental control systems
Meets ASME code for Boiler and Pressure Vessels
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