Inconel 686 Special Alloy UNS N06686 Overlay Of Ferrous Components
For Marine Service
Product 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.
Similar Grade
Chemical Composition(%)
| % | Ni | Cr | Fe | C | Mn | Si | P | S | W | Ti | Mo |
| Min | Bal. | 19.0 | | | | | | | 3.0 | 0.02 | 15.0 |
| Max | | 23.0 | 2.0 | 0.01 | 0.75 | 0.08 | 0.04 | 0.02 | 4.4 | 0.25 | 17.0 |
Physical Properties
| Grade | Density | Melting Point | Tensile strength,MPa | Yield strength,MPa | Elongation,% |
| Inconel 686 | 8.73g/cm3 | 1338°C-1380 °C | 740 | 396 | 60 |
Feature
INCONEL alloy 686 exhibits excellent resistance to general,
galvanic, and localized corrosion and hydrogen embrittlement in
seawater.In addition, seawater has only a minor effect on the
fatigue strength of the alloy. Thus, alloy 686 is an ideal material
for marine service.
Specification Standard
| Rod,Bar | Pipe, Tube | Plate, Sheet, Strip |
ASTM B 462, ASTM B 564 / ASTM B 574 / ASME B 574, DIN 17752, DIN
17753, DIN 17754 | ASTM B 163 ASTM B 619 ASTM B 622 ASTM B 626 ASTM B 751 ASTM B 775
ASTM B 829 DIN 17751 | ASTM B 575 / ASME SB 575, ASTM B 906 / ASME SB 906, DIN 17750 |
Welding products: INCO-WELD Filler Metal 686CPT - AWS A5.14 /
ERNiCrMo-14, INCO-WELD Welding Electrode 686CPT - AWS A5.11 /
ENiCrMo-14
APPLICATIONS
Alloy 686 fasteners (bolts, nuts, studs, etc.) perform well in
marine service. Alloy 686 can be strengthened by cold working to
yield strength levels of 150 ksi if high strength bolting is
required. These high strength fasteners offer essentially the same
resistance to corrosion in seawater as annealed material.
INCONEL alloy 686 welding products (INCO-WELD 686CPT) are ideal for
overlay of ferrous components for marine service. With their high
alloy content and low iron content, overlays deposited with alloy
686 welding products offer excellent corrosion resistance. It is
often possible to use thinner overlay deposited with fewer weld
layers when using alloy 686 products as compared
