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Inconel 706 / UNS N0970

Inconel 706 (UNS N09706) is a nickel-iron-chromium. As alloy 706 is a precipitation-hardenable alloy that provides high mechanical strength in combination with good fabricability. The properties of Alloy 706 are similar to Alloy 718 however alloy 706 is more readily fabricated. The main uses of Alloy 706 are for aerospace and land base gas turbine parts and components.

Inconel 706 Composition:

UNS N09706 is an austenitic stainless steel alloy with a nominal composition of 68% iron, 22% chromium, 5% manganese, and 3% molybdenum. It also contains trace amounts of carbon, titanium, silicon, and aluminum. The addition of these elements gives the alloy improved formability and weldability compared to other alloys in the same class. Additionally, Inconel 706 has excellent mechanical properties, including high strength at elevated temperatures, as well as good ductility and toughness even at low temperatures.

Weight %

Ni+Co

Nb+Ta

Alloy 706

39.0 – 44.0

14.5 – 17.5

Bal

2.5 – 3.3

1.5 -2.0

0.40 max

0.06 max

0.30 max

0.35 max

0.015 max

0.020 max

0.006 max

1 max

Inconel 706 Chemical Properties:

UNS N09706 is an emerging alloy in the chemical industry, and it has some impressive properties that make it suitable for a variety of uses. This nickel-iron-chrome-based alloy has excellent corrosion, oxidation, and heat resistance, making it ideal for use in environments that experience severe temperatures and high levels of acidity or causticity. Additionally, Inconel 706 has very good mechanical properties, with excellent yield and tensile strength at even high-temperature conditions. These properties open up possibilities for its use in fields such as heat exchanging systems, exhaust systems on machinery and airplanes, as well as general chemical processing equipment. With these factors in consideration, Inconel 706 is proving to be a reliable material in modern chemical equipment design.

Inconel 706 Mechanical Properties:

UNS N09706 is a high-temperature alloy with remarkable mechanical properties. With its superior strength-to-weight ratio, it is incredibly versatile and can be used in many applications, often requiring a combination of high strength and resistance to general corrosion. Its ability to withstand rapid temperature changes makes it ideal for jet engines and other applications where heat is a factor. Plus, Inconel 706 has proven ductility and can be formed into virtually any shape while maintaining its tensile strength. The alloy’s exceptional performance means that parts made from Inconel 706 require less maintenance over their lifetime, saving valuable time and money in the long run.

Properties	Metric	Imperial
Tensile strength	757 MPa	109800 psi
Yield strength (at strain 0.200%)	383 MPa	55500 psi
Poisson’s ratio (precipitation hardened, calculated by mfr)	0.382	0.382
Modulus of elasticity (precipitation hardened, dynamic method)	210 GPa	30500 ksi
Elongation at break	47%	47%

Inconel 706 Physical Properties:

UNS N09706 is a nickel-iron-chromium alloy known for its superior physical properties. It offers exceptional corrosion resistance, high strength at elevated temperatures, and outstanding creep resistance. In extreme situations such as chemical processing, aerospace engineering, and nuclear activities, Inconel 706 can remain durable. Furthermore, it exhibits excellent mechanical toughness and excellent weldability, making it perfect for components with complex shapes and tight tolerances. Despite its extensive list of advantages, the alloy does not perform well in cyclic applications due to precipitation hardening during exposure to thermal cycles. For this reason, it has limited applications in aircraft turbine engines. In sum, Inconel 706 is an excellent choice when parameters of the life cycle, temperature range, and corrosion resistance all must be closely maintained.

Properties	Metric	Imperial
Density	8.05 g/cm³	0.291 lb/in³
Melting point	1360°C	2480°F

Inconel 706 Thermal Properties:

Properties	Metric	Imperial
Thermal expansion co-efficient (at 24-100°C/75.2-212°F)	13.46 µm/m°C	7.478 µin/in°F
Thermal conductivity	12.5 W/mK	86.8 BTU in/hr.ft².°F

Inconel 706 Equivalent:

AMS 5605
AMS 5606
AMS 5701
AMS 5702
AMS 5703

Inconel 706 Uses:

It is often used for components such as shafts, fasteners and bolts that are exposed to extreme environments or exposure to aggressive chemicals like acids or alkalis. It can also be used in applications where high-temperature performance is required, such as turbines or furnaces. Additionally, because of its superior corrosion resistance properties, it is often used in saltwater environments or other harsh marine conditions like oil platforms or deep-sea pipelines.

Heat Treatment:

Inconel 706 is an ideal material for heat treatment. Its unique blend of iron, nickel-chromium-cobalt, and molybdenum gives it the perfect balance of strength, corrosion resistance and stress relaxation capabilities. Its ability to withstand extreme temperatures makes it suitable for numerous industrial applications such as petrochemical plants or aerospace parts. When heat is treated properly with different methods such as age hardening, solution annealing, sputtering or precipitation hardening, the metal product made out of Inconel 706 can be further enhanced in many ways, including increased strength and durability. This property makes it one of the go-to materials when dealing with temperature-sensitive components or products in industries that require higher levels of corrosion resistance.

Corrosion Resistance:

Due to its superior strength and corrosion resistance properties, Inconel 706 is used in many industries, including aerospace, automotive and power generation.

Heat Resistance:

In addition to its excellent mechanical properties, Inconel 706 also has good heat resistance properties making it suitable for use in high-temperature applications such as turbines or furnaces where thermal cycling occurs frequently.

Machining:

It has good machinability allowing it to be machined easily into intricate shapes without sacrificing too much material integrity during the process.

Welding:

Finally, when welding this material, it should be done with caution as it can be prone to cracking if not done correctly, so make sure you have an experienced welder on hand when attempting this process with your Inconel 706 components.