Inconel 686 Alloy Properties
Inconel 686 (UNS N06686)alloy is a low carbon, the most highly alloyed corrosion-resistant alloy, which is outstanding resistance to oxidizing, reducing, and mixed acid environments.
Fabrication for Inconel 686
Hot forming should be between 1600 and 2500℉(870 and 1230℃), with all heavy forming above 2000℉(1090℃). Work hardening during cold forming may make intermediate annealing necessary. Inconel 686 is normally annealed at 2150-2200℉(1180-1200℃), with rapid cooling.
Corrosion of Inconel 686 alloy
1. Resistance to General corrosion:
General corrosion, an even, uniform attack of the alloy surface, is the most commonly encountered form of corrosion. This type of attack is predictable, which allows effective estimation of the life of components. The corrosion rate is significantly affected by the concentration of the corrosive medium, the presence of contaminants in the medium, and temperature.
15% HCI Boiling: 2mpy
80% H2SO4,93℃: 29mpy
90% H2SO4, 93℃: 8mpy
FGD1, 80℃: 23mpy
FGD2, 105℃: 274mpy
*mpy can be converted to mm/a by multiplying by 0.0254; FGD1: 60%H2SO4+2.5%HCI+0.2%HF+0.5% flyash at 80℃; FGD2: 70% H2SO4+2.5%HCI+0.2%HF at 105℃
2. Resistance to localized corrosion:
Localized attack, pitting and crevice corrosion, can occur very quickly and lead to premature, unexpected failure. While the general attack of the surface of the component may be very light, a single pit may propagate throught the thickness of the part causing leakage and failure. Crevice corrosion, as the name implies, takes place within the crevices formed by overlapping sections of metal or under tightly adhering deposits.
