UNS N06686

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HuaNickel UNS N06686 is a single-phase austenitic nickel-chromium-molybdenum-tungsten alloy with excellent corrosion resistance in a range of severe environments, with its high nickel (Ni) and molybdenum (Mo) providing good resistance under reducing conditions, while high chromium (Cr) has oxidation resistance and media molybdenum (Mo) and tungsten (W) auxiliaries resist localized corrosion.

UNS N06686Chemical composition:

Ni Cr Mo Ti W C Mn S Si P Fe
Min Bal 19 15 0.02 3.0
Max 23 17 0.25 4.4 0.01 0.75 0.02 0.08 0.04 5

UNS N06686Physical properties:

Density 8.73g/cm3
Melting point 1338-1380℃
Thermal conductivity 9.8W/m•°C
Resistivity 1.237µΩ•m

UNS N06686Mechanical properties:

Product form Thickness or diameter tensile strength Yield Strength (0.2% offset) Elongation
in mm ksi Mpa ksi Mpa %
board 0.5 12.7 104.7 722 52.8 364 71
board 0.25 6.35 106.3 733 57.9 399 98
sheet 0.125 3.18 116.5 803 61.1 421 59
sheet 0.062 1.57 123 848 59.2 408 59
club 1.5 38.1 117.5 810 52.1 359 56

UNS N06686Alloy properties:

Corrosion Resistance :HuaNickel  UNS N06686 provides outstanding resistance to general corrosion, stress corrosion cracking, and pitting and crevice corrosion. It resists intergranular precipitation during welding and maintains its corrosion resistance in the heat-affected zone of the welded joint. It provides resistance to solutions of reduced and oxidized acids and mixed acids. It is particularly suitable for the treatment of mixed acids containing high concentrations of halides. It exhibits good resistance to mixed acid media with a pH level of 1 or below and chloride levels above 100,000 ppm.

High-temperature strength: The alloy exhibits excellent high-temperature strength, allowing it to work stably in extremely high-temperature, high-pressure environments. This property makes UNS N06686 an ideal material for high-temperature components such as engines, gas turbines, combustion chambers and turbine blades.

UNS N06686Uses of alloys:

HuaNickel UNS N06686 alloy excels in several demanding industrial applications due to its excellent corrosion resistance, high-temperature strength, and good mechanical properties. It is mainly used for heat exchangers, reaction vessels and conveyor pipes in chemical treatment, pollution control, papermaking, industrial and municipal waste treatment. It is also widely used in aerospace, petrochemical, energy and other fields, especially in harsh environments that require circulating heating and cooling.

UNS N06686Process performance:

Welding process: UNS N06686 is easy to weld and does not require post-weld heat treatment to restore corrosion resistance. The recommended welding products are Protective Metal Arc Electrode and Gas Tungsten Arc Electrode 686CPT.

Manufacturing: UNS N06686 is easy to manufacture. The forming operation can be used with standard methods for other high-nickel alloys such as conconel C-276, 22 and 625. Work hardening during cold forming may make intermediate annealing necessary. Thermoforming should be between 1600-2250°F (870 and 1230°C) and all reforming should be above 2000°F (1090°C). UNS N06686 typically cools rapidly at 2150-2200°F (11801200°C).

Relevant standards:

Rods, rods, rods, wires, and forging blanks- ASTM B 462、ASTM B 564 / ASME SB 564、ASTM B 574 / ASME B 574、DIN 17752、DIN 17753、DIN 17754

Plates, plates, and belts ASTM B 575 / ASME SB 575,ASTM B 906 / ASME SB 906,DIN 17750

tube- ASTM B 163 / ASME SB 163,ASTM B 619 / ASME SB 619,ASTM B 622 / ASME SB 622,ASTM B 626 / ASME SB 626,ASTM B 751 / ASME SB 751,ASTM B 775 / ASME SB 775,ASTM B 829 / ASME SB 829,DIN 17751

Welding Products – Welding filler metals686CPT – AWS A5.14 / ERNiCrMo-14

fasteners- ASTM F 467、F 467M、F 468、F 468M;SAE/AMS J2295、J2271、J2655、J2280、J2484、J2485- DIN 17744

Detail datasheet