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Nimonic 80A – High-Temperature Nickel-Based Alloy

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Overview


Nimonic 80A is a high-temperature nickel-based alloy known for its excellent high-temperature strength, creep resistance, and oxidation resistance, making it ideal for use in aero engines, gas turbines, nuclear industry, and heat treatment equipment. It is strengthened through solution treatment and age hardening, with aluminum (Al) and titanium (Ti) added to form the γ’ (Ni₃(Al,Ti)) precipitate, significantly improving its creep resistance.



1. Nominal Chemical Composition of Nimonic 80A (%)

Element

Ni (Nickel)

Cr (Chromium)

Co (Cobalt)

Ti (Titanium)

Al (Aluminum)

Fe (Iron)

Mn (Manganese)

Si (Silicon)

Cu (Copper)

C (Carbon)

S (Sulfur)

Nominal Value

Balance

18–21

≤2.0

1.8–2.7

1.0–1.8

≤3.0

≤1.0

≤1.0

≤0.2

0.06–0.12

≤0.015

Function of Major Elements:

Nickel (Ni): Base element providing high-temperature strength and corrosion resistance.

Chromium (Cr): Enhances oxidation and corrosion resistance.

Titanium (Ti) + Aluminum (Al): Form γ’ phase to improve high-temperature strength and creep resistance.

Iron (Fe): Limited to avoid compromising high-temperature strength.

Cobalt (Co): Improves thermal stability and enhances creep resistance.

Carbon (C): Increases hardness at high temperatures but excessive content can cause embrittlement.

Sulfur (S): Restricted to prevent degradation of hot workability.



2. Physical Properties

Property

Value

Density

8.0 g/cm³

Melting Point

1320–1365°C

Specific Heat Capacity

460 J/(kg·K)

Thermal Conductivity

11.3 W/(m·K) @ 100°C

Electrical Resistivity

1.18 μΩ·m

Coefficient of Thermal Expansion

12.8 × 10⁻⁶ /°C (20–1000°C)

Magnetism

Non-magnetic



3. Mechanical Properties


(1) At Room Temperature (After Aging Treatment)

Property

Tensile Strength (MPa)

Yield Strength (MPa)

Elongation (%)

Hardness (HB)

Typical

1000

600

20

260–310

(2) At Elevated Temperatures

Temperature (°C)

Tensile Strength (MPa)

Yield Strength (MPa)

Elongation (%)

600

780

450

18

800

420

250

22

1000

120

70

40

(3) Creep Rupture Strength

Temperature (°C)

Stress (MPa)

Time to Rupture (h)

650

280

1000

700

230

1000

800

110

1000



4. Heat Treatment Process


Nimonic 80A is primarily strengthened by solution treatment followed by age hardening:

Treatment

Temperature (°C)

Time (h)

Cooling Method

Solution Treatment

1080–1120

2–4

Air cooling

Aging Treatment

700–750

16

Air cooling

Purpose:

Solution Treatment: Improves microstructure uniformity, ductility, and toughness.

Aging Treatment: Precipitates γ’ strengthening phase, enhancing creep and high-temperature strength.



5. Key Characteristics


Excellent high-temperature strength: Up to 1000 MPa after aging

Superior creep resistance: Suitable for long-term high-temperature loading

Outstanding oxidation resistance: Operable in oxidizing atmospheres from 850 to 1000°C

Good thermal stability: Resists phase transformations at high temperatures

Good weldability: Supports TIG/MIG, resistance welding, electron beam welding

Excellent machinability: Compatible with turning, milling, drilling, and grinding



6. Typical Applications


(1) Aerospace

• Aero engines: turbine blades, combustion chamber parts, exhaust systems

• Turbocharger components: exposed to high temperature and pressure


(2) Power Generation and Nuclear Industry

• Gas turbines: turbine blades, guide vanes

• Nuclear reactors: fuel assemblies and high-temperature structural components


(3) Heat Treatment Industry

• High-temperature furnace linings, heat exchangers, industrial furnace parts


(4) Fasteners and Springs

• High-temperature bolts, washers

• High-temperature springs


(5) Others

• Automotive exhaust systems

• Corrosion-resistant parts in chemical equipment



7. Comparison with Similar Alloys

Alloy

Main Composition

Max Service Temp (°C)

Oxidation Resistance

Creep Strength

Applications

Nimonic 80A

Ni-Cr-Ti-Al

1050

Excellent

High

Aerospace, gas turbines

Nimonic 75

Ni-Cr-Ti

1000

Good

Moderate

Industrial furnaces, fasteners

Inconel 718

Ni-Cr-Fe-Nb

1200

Excellent

Very High

Aerospace, nuclear industry

Hastelloy X

Ni-Cr-Fe-Mo

1200

Excellent

Very High

Aerospace



8. Available Forms


✅ Rods (Diameter: 5mm–200mm)

✅ Plates (Thickness: 0.5mm–50mm)

✅ Tubes (Outer Diameter: 6mm–100mm)

✅ Wires (Diameter: 0.1mm–10mm)

✅ Custom parts (Machined to drawing)



9. Procurement & Supply


If you require Nimonic 80A or other high-temperature alloys (such as Inconel 718, Hastelloy X), please provide:


• Specification and dimensions (plate, bar, tube, etc.)

• Quantity required

• Application environment (e.g., temperature, corrosive media)