Alloy686

HuaNickel alloy 686 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.

Alloy686Chemical composition：

	Ni	Cr	Mo	Ti	W	C	Mn	S	Si	P	F
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	2.0

Alloy686Physical properties：

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

Alloy686Mechanical 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

Alloy686Alloy properties：

Corrosion Resistance : Alloy686 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 Alloy686 an ideal material for high-temperature components such as engines, gas turbines, combustion chambers and turbine blades.

Alloy686Uses of alloys：

HuaNickel Alloy686 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.

Alloy686Process performance：

Welding process: Alloy686 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: Alloy686 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). Alloy686 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