Undecided between Nimonic 75 and Nimonic 80A round bars? While both are premium nickel-chromium superalloys, their performance at 800°C is affected by different metallurgical mechanisms. As a leading superalloy manufacturer in China, Gnee Steel understands the "hidden" differences that determine component lifespan. Whether you need the oxidation resistance of Nimonic 75 alloy bars or the creep strength of Nimonic 80A bars, we can provide aerospace-grade materials at factory-direct prices.
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What Is the Difference Between NIMONIC 75 Bar and NIMONIC 80 Bar?
What Is the Difference Between NIMONIC 75 Bar and NIMONIC 80 Bar?
The main difference between NIMONIC 75 bars and NIMONIC 80A (usually referred to as 80) bars is that NIMONIC 80A is a precipitation hardening alloy designed to improve strength and creep resistance at high temperatures; while NIMONIC 75 is a solid solution strengthened alloy that optimizes formability and provides excellent oxidation resistance at moderate to high temperatures.
What is NIMONIC 75 material?
NIMONIC 75 alloy is an 80/20 nickel-chromium alloy with added titanium and carbon. This alloy was originally introduced in the 1940s for the manufacture of turbine blades. It is easy to machine and weld, and possesses good corrosion resistance, mechanical properties, and heat resistance.
NIMONIC 75 (Alloy 75, 2.4630/2.4951): An 80/20 nickel-chromium alloy with added titanium and carbon. It is known for its high-temperature strength, good ductility, and excellent machinability.
NIMONIC 75 Vs NIMONIC 80A Bar
NIMONIC 80A (Alloy 80A, 2.4952): A precipitation-hardening nickel-chromium alloy with significant additions of titanium and aluminum, exhibiting excellent tensile strength and creep rupture properties at high temperatures (up to 815°C).
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1. Chemical composition (wt%) of Nimonic 75 and Nimonic 80A
| Alloy | Nickel (Ni) | Chromium (Cr) | Titanium (Ti) | Aluminum (Al) | Iron (Fe) |
|---|---|---|---|---|---|
| Nimonic 75 | Balance | 19 - 21% | 0.2 - 0.6% | – | ≤ 5.0% |
| Nimonic 80A | Balance | 18 - 21% | 1.8 - 2.7% | 1.0 - 1.8% | – |
*Nimonic 75: The Ni-Cr-Ti balance ensures a tenacious oxide scale.*
*Nimonic 80A: The addition of Al creates the gamma-prime phase for extreme hardness.*
2. Mechanical properties of Nimonic 75 and Nimonic 80A at 800°C
| Property | Nimonic 75 | Nimonic 80A |
|---|---|---|
| Tensile Strength (Rm) | – | Significantly stronger due to age-hardening |
| Plasticity (Elongation) | ≥ 35% | ≥ 15% |
Nimonic 75 is far more forgiving for complex shaping.
3. Nimonic 75 and Nimonic 80A equivalent standards
| Alloy | Equivalent Standards |
|---|---|
| Nimonic 75 | GH3030 / EI435 (ЭИ435) / UNS N06075 |
| Nimonic 80A | GH4080A / EI437 (ЭИ437) / UNS N07080 |
Click to download the GH3030 alloy PDF file now
4. Processing information for Nimonic 75 and Nimonic 80A alloys
| Feature | Nimonic 75 (GH3030 / EI435) | Nimonic 80A (GH4080A / EI437) |
| Strengthening | Solid Solution (Stable & Ductile) | Precipitation Hardening (
γ′γ′ phase) |
| Key Additions | Titanium (Ti) for grain refinement | Titanium (Ti) + Aluminum (Al) |
| 800°C Priority | Ultimate Oxidation Resistance | Superior Creep-Rupture Strength |
| Fabrication | Excellent (Easy to Weld/Form) | Moderate (Requires precise heat treat) |
| Commercial Value | High ROI for Burner Parts | Best for High-Stress Fasteners |
5. Choosing Between Nimonic 75 and Nimonic 80A Alloy Bars
If you are manufacturing combustion chamber liners, industrial furnace linings, or burner components, choose Nimonic 75 round bars. Like the "shell" of an engine, they are designed for high temperatures and oxidation resistance, and are less prone to cracking.
If you are manufacturing high-temperature fasteners, exhaust valves, or turbine blades, choose Nimonic 80A round bars. Like the "skeleton" of an engine, they are designed to withstand immense mechanical stress at temperatures up to 800°C, and maintain their shape.
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FAQ
Q1: Can I replace Nimonic 80A with Nimonic 75 to save on procurement costs?
A: Only if the component is not under mechanical load. If the part is a fastener or a rotating shaft, Nimonic 75 lacks the creep strength of Nimonic 80A and will fail. However, for non-load-bearing heat shields, switching to Nimonic 75 can save you 25-35% in material and machining costs.
Q2: Does your factory provide Mill Test Certificates (MTC)?
A: Yes. As a certified superalloy supplier, every batch is shipped with a full EN 10204 3.1 MTC. We also provide 100% Ultrasonic Testing (UT) to ensure zero internal defects in our h9 precision ground bars.
Q3: What is the lead time for EI435 (ЭИ435) equivalent bars?
A: We maintain a massive inventory in stock for standard Nimonic 75 and 80A diameters (Φ10mm - Φ120mm). Stock items can be shipped within 7-10 days globally.