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Super Alloy Nimonic 80A (UNS N07080)
Date:2024-04-03 14:16:51View:144Tags:Nickel Alloy Supplier

Alloy 80A (nimonic) is a nickel-chromium alloy with additions of titanium and aluminium, which enable it to be strengthened by precipitation hardening. This grade is supplied in the solution treated condition for ease of machinability, but an aging treatment will give the material very high mechanical properties, an outstanding resistance to creep at service temperatures up to 815ºC (1500ºF) and a high resistance to fatigue under very arduous conditions.

Alloy 80A offers excellent corrosion resistance in oxidising atmospheres including under cyclical conditions of heating and cooling. This corrosion resistance can be attributed to an adherent chromium oxide film (CrO3) that forms on the alloy surface, which protects it from progressive corrosion and also gives a high scaling resistance at elevated temperatures.

 

Alloy 80A offers a good machinability, is readily formable and weldable using common welding methods.

 

Chemical Composition

The chemical composition of nimonic 80A alloy is outlined in the following table.

Element

Content (%)

Chromium, Cr

18-21

Iron, Fe

3

Titanium, Ti

1.8-2.7

Aluminum, Al

1-1.8

Silicon, Si

1

Manganese, Mn

1

Copper, Cu

0.2

Cobalt, Co

0.2

Carbon, C

0.1

Phosphorus, P

0.045

Boron, B

0.008

Nickel, Ni

Balance

 

Physical Properties

The following table shows the physical properties of nimonic 80A alloy.

Properties

Metric

Imperial

Density

8.19 g/cm3

0.296 lb/in3

Melting point

1320-1365°C

2410-2489°F

 

Mechanical Properties

The mechanical properties of nimonic 80A alloy are displayed in the following table.

Properties

Metric

Imperial

Tensile strength (Precipitation hardened)

1250 MPa

181000 psi

Yield strength (Precipitation hardened)

780 MPa

113000 psi

Elongation at break (Precipitation hardened)

30%

30%

 

Thermal Properties

The thermal properties of nimonic 80A alloy are given in the following table.

Properties

Metric

Imperial

Thermal expansion co-efficient (@20-100°C/68-212°F)

12.7 µm/m°C

7.06 µin/in°F

Thermal conductivity

11.2 W/mK

77.7 BTU.in/hrft².°F

 

Fabrication and Heat Treatment

Machinability

Nimonic 80A alloy can be machined using conventional machining techniques used for iron-based alloys.

 

Forming

The alloy has good ductility, and can be readily formed using all conventional methods.

 

Welding

Nimonic 80A alloy can be welded using conventional welding techniques such as gas-tungsten arc welding, shielded metal-arc welding and submerged-arc welding.

 

Heat Treatment

Nimonic 80A alloy can be heat treated at 1079°C (1975°F) for 8h and air cooled.

 

Forging

The alloy can be forged at temperatures ranging between 982 to 1177°C (1800 to 2150°F).

 

Cold Working

Cold working of this alloy can be done using standard tooling.

 

Annealing

The alloy can be annealed at 1079°C (1975°F) for 8 h and air cooled.

 

Hardening

The alloy can be hardened by cold working.

 

Other Designations

Other designations that are equivalent to nimonic 80A alloy include the following:

ASTM B637

DIN 2.4631

DIN 2.4952

 

Applications

The following are the list of applications of nimonic 80A alloy:

Gas turbine components (blades, rings and discs)

Bolts

Nuclear boiler tube supports

Die casting inserts and cores

Automobile exhaust valves.

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