Incoloy 706 Alloy

General Characteristics of Incoloy 706 Alloy

This is a precipitation-hardening nickel-base alloy that displays high strength from cryogenic temperatures to around 1200ºF (650ºC).

Chemical Analysis
C Carbon
0.06 max
Mn Manganese
0.35 max
P Phosphorus
0.020 max
S Sulfur
0.015 max
S Sulfur
0.015 max
Cr Chromium
14.50/17.50
Ni Nickel
0.15 – 0.25
Ti Titanium
0.15 – 0.25
Cu Copper
0.15 – 0.25
Al Aluminium
0.15 – 0.25
Cb + Ta Columbium + Tantalum
0.15 – 0.25
B Boron
0.15 – 0.25

Applications

The alloy is used in applications where good high-temperature strength and fabrication characteristics are required in larger section sizes. This leads to uses as turbine discs in large industrial gas turbines as well as aerospace turbines. Shafts, cases, mounts and fasteners are other turbine engine part applications.

The alloy is also used in the oil and gas industry where the pitting and stress corrosion resistance of the usual Cr-Mn-N austenitic stainless steels do not measure up to requirements.

Forging

The alloy has better hot workability than most superalloys and may be forged between 2100/1600ºF (1150/870ºC).

Heat treatment

The alloy may be heat treated for optimum tensile properties or for optimum creep-rupture properties.
For tensile properties: solution treat at 1700/1850ºF (925/1010ºC) for time according to section size, and air cool, plus 1350ºF (730ºC) 8 hrs and furnace cool at 100ºF (55ºC) to 1150ºF (620ºC), hold for 8 hrs and air cool.

For creep-rupture properties: solution treat at 1700/1850ºF (925/1010ºC) for time according to section size, and air cool, plus 1550ºF (845ºC) 3 hrs and air cool plus 1325ºF (720ºC) 8 hrs and furnace cool at 100ºF (55ºC) to 1150ºF (620ºC), hold for 8 hrs and air cool.

Machinability

The alloy may be machined in the annealed or aged conditions. It shows better machinability than alloy 718 and other age-hardening superalloys, and higher cutting speeds and longer tool lives are possible.

Weldability

The alloy has excellent weldability and resistance to post-weld cracking.

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