N06686/inconel 686



Super alloys or high performance alloys have the capacity to function under very high temperatures and severe mechanical stress, and also where high surface stability is required. They have good creep and oxidation resistance, and can be produced in a variety of shapes.

Strengthening of super alloys is performed by solid-solution hardening, work hardening, and precipitation hardening. Super alloys contain a number of elements in a variety of combinations to achieve the desired result.

Inconel 686™ is a single phase Ni-Cr-Mo-W alloy that is primarily used in extremely corrosive applications, e.g. flue gas desulfurization systems and processing plants in which mixed acids are used. This alloy is also used in fields where localized pitting is difficult.

The following datasheet will provide more details about Inconel 686™.

Chemical Composition

The following table shows the chemical composition of Inconel 686™.

Element Content (%)
Nickel, Ni 59
Chromium, Cr 19-23
Molybdenum, Mo 15-17
Iron, Fe ≤ 5
Tungsten, W 3.0-4.40
Manganese, Mn ≤ 0.75
Phosphorous, P ≤ 0.040
Sulfur, S ≤ 0.020
Titanium, Ti 0.020-0.25
Carbon, C ≤ 0.010

Physical Properties

The physical properties of Inconel 686™ are outlined in the following table.

Properties Metric Imperial
Density 8.72 g/cm³ 0.315 lb/in³
Melting point 1338-1380 °C 2440-2520 °F

Mechanical Properties

The mechanical properties of Inconel 686™ are provided below.

Properties Metric Imperial
Tensile strength 721.9 MPa 104700 psi
Yield strength (@strain 0.200%) 364 MPa 52800 psi
Elastic modulus 207 GPa 30000 ksi
Shear modulus 77 GPa 11200 ksi
Poisson’s ratio 0.34 0.34
Elongation at break 71% 71%

Thermal Properties

The thermal properties of Inconel 686™ are given below.

Properties Metric Imperial
Thermal expansion co-efficient (@21-100°C/69.8-212°F) 11.97 µm/m°C 6.650 µin/in°F





Supply Form



Thickness?0.40-4.75mm?General Width?1000?1219?1500mm

Whole Coil or piece of it

Cold Annealed?Surface 2B?2E


Thickness?4.76-60mm?Width?1500?2000?2500mm?Length?3000?6000?8000?8500mm?Under 10mm plate can be coiled?

Whole Coil or piece of it

Single hot rolling?Solid solution annealed state?Surface 1D



Whole Coil or Specified size

Cold Annealed?Surface 2B?2E

Bar & Rod

Rolled barΦ5-45mm?Length≤1500mm

Polished Bar?circle?Square?

Solution annealing,descaling

Forged barΦ26-245mm?Length≤4000mm

Weld tube

Outer diameterΦ4.76-135mm?Wall Thickness0.25-4.00mm?Length?≤35000 mm

Base on your requirement

Use for PHE

Seamless Tube

Outer diameterΦ3-114mm?Wall Thickness0.2-4.5mm

Base on your requirement

Use for PHE


Outer diameterΦ0.1-13mm

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

Forged piece

roundness and square alloy

Base on your requirement

Steel, Alloy


All kinds of Flangs

Base on your requirement

Steel, Alloy

Welding Material

Coil wire Φ0.90mm/1.2mm/1.6mm

Base on your requirement

Certificate of Origin?America, Sweden, Britain, Germany, Austria, Italy, France.

Straight WireΦ1.2mm/1.6mm/2.4mm/3.2mm/4.0mm

Welding rodΦ2.4mm/3.2mm/4.0mm


Elbow, three links, four links, different diameter size

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

Explosive bonded laminate

Raw Sheet Thickness≥2mm

Base on your requirement

Ni & Ni alloy, Ti & Ti alloy

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