Nimonic 80A is a wrought, age-hardenable nickel-chromium alloy, strengthened by additions of titanium, aluminum, and carbon. It is similar to Nimonic 75 but has improved properties due to the additional elements. This alloy is known for its excellent corrosion and oxidation resistance, as well as high tensile strength and creep resistance at elevated temperatures.
Chemical Composition
The typical chemical composition of Nimonic 80A includes:
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Carbon (C): 0.04% - 0.10%
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Chromium (Cr): 18.0% - 21.0%
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Silicon (Si): ≤1.0%
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Manganese (Mn): ≤1.0%
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Sulfur (S): ≤0.015%
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Titanium (Ti): 1.8% - 2.7%
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Aluminum (Al): 1.0% - 1.8%
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Boron (B): ≤0.008%
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Nickel (Ni): Balance.
Physical Properties
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Density: 8.15 - 8.19 g/cm³
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Melting Point: 1365 - 1405 °C
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Coefficient of Thermal Expansion: 12.7 μm/m°C (20 - 100°C)
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Modulus of Elasticity: 222 kN/mm²
Mechanical Properties
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Tensile Strength: 1200 - 1800 N/mm² (after age hardening)
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Yield Strength: 503 - 1500 N/mm² (depending on condition)
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Elongation: 17% - 39% (depending on condition)
Applications
Nimonic 80A is widely used in industries where high-temperature performance and corrosion resistance are critical. Typical applications include:
Processing and Treatment
Nimonic 80A is usually supplied in the solution-treated condition, which facilitates machining. Subsequent age hardening significantly enhances its mechanical properties. The alloy can be readily formed and welded using conventional methods.
Summary
Nimonic 80A is a versatile and high-performance material, suitable for demanding applications in aerospace, energy, and automotive industries. Its excellent resistance to corrosion, oxidation, and high-temperature creep makes it a preferred choice for components exposed to harsh environments
Tensile Data
Mechanical Property Requirements |
| Ultimate Tensile | Yield Strength (0.2% OS) | Elong. in 2 in. or 50mm or 4D, min., % | R/A | Hardness |
Cold Worked/As worked |
Min | 110 KSi | 85 KSi | 10 |
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Min | 760 MPa | 585 KSi |
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Hot Worked/As worked |
Min | 90 KSi | 40 KSi | 25 |
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Max |
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Min | 620 MPa | 275 MPa |
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D- Forging quality is furnished to chemical requirements and surface inspection only. No mechanical properties required.
Specifications
Form | Standard |
Metal Type | UNS N07080 |
Bar | ASTM B637 AMS 5662 |
Wire | ASTM B805 |
Sheet | ASTM B906 AMS 5664 |
Plate | ASTM B906 AMS 5664 |
Tube | ASTM B829 |
Pipe | ASTM B829 |
Fitting | ASTM B829 |
Forging | ASTM B670 |
Weld Wire |
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Weld Electrode |
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Din |
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Machining
Machinability Ratings
MACHINING DATA |
Carbide tools are suggested
for rates better than 50% of Type 304. |
Machining Type | Suggested starting rates are: |
Single Point turning : | Roughing - 0.15" depth, 0.015"/rev feed -175 SFM
Finishing - 0.025" depth, 0.007"/rev feed - 200 SFM |
Drilling : | 1/4" Dia hole - 0.004"/rev feed - 60 SFM
1/2" Dia hole - 0.007"/rev feed - 60 SFM
3/4" Dia hole - 0.010"/rev feed - 60 SFM |
Reaming : | Feed - same as drilling - 100 SFM |
Side and Slot Milling : | Roughing - 0.25" depth - 0.007"/tooth feed - 125SFM
Finishing - 0.050" depth - 0.009"/tooth feed - 140SFM |
These rates are for carbide tools,
Type C-2 for roughing, drilling and reaming.
Type C-3 for finishing. |