For high-temperature engineering, the devil is in the details-especially the addition of trace elements. While both alloys use nickel-chromium as a matrix, their fundamental difference lies in their hardening mechanisms. Nimonic 75 (UNS No. 6075) uses only titanium to refine the grains and improve solid solution stability. Nimonic 80A (UNS No. 7080), on the other hand, adds a critical proportion of aluminum and titanium, forming the γ′ phase through precipitation hardening. As a professional nickel alloy supplier, Gnee Steel offers data-driven comparative analysis to ensure the integrity of the mechanical properties for your projects.
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High-Temperature Performance of Nimonic 75 (GH3030) and Nimonic 80A (GH4080A)
High-Temperature Performance of Nimonic 75 (GH3030) and Nimonic 80A (GH4080A)
Nimonic 75 (GH3030) and Nimonic 80A (GH4080A) are both nickel-chromium-based superalloys designed for high-temperature environments, but they differ significantly in their strengthening mechanisms, operating temperature ranges, and mechanical strength. Nimonic 80A is a precipitation-strengthened alloy, suitable for higher stresses and temperatures, while Nimonic 75 is a solid-solution-strengthened alloy, used for medium-strength, high-oxidation-resistance applications.
What are the equivalent materials for NIMONIC 75?
Other materials equivalent to NIMONIC 75 alloy include: DIN 2.4630 and DIN 2.4951.
1. Chemical composition of Nimonic 75 and Nimonic 80A
The transition from a "heat-resistant alloy" to a "high-strength superalloy" happens at the elemental level. Our GH3030 and GH4080A materials are produced via VIM + ESR melting to ensure precise elemental control.
| Element (%) | Nimonic 75 (EI435 / GH3030) | Nimonic 80A (EI437 / GH4080A) | The Engineering Difference |
| Nickel (Ni) | Balance (≥75.0) | Balance (≥70.0) | High Ni ensures austenitic stability |
| Chromium (Cr) | 19.0 - 22.0 | 18.0 - 21.0 | Superior oxidation resistance |
| Titanium (Ti) | 0.15 - 0.35 | 1.80 - 2.70 | 80A uses Ti for precipitation |
| Aluminum (Al) | ≤ 0.50 | 1.00 - 1.80 | Al in 80A forms the
γ′γ′ strengthening phase |
| Iron (Fe) | ≤ 1.50 | ≤ 3.00 | Controlled for purity |
2. Mechanical properties of Nimonic 75 and Nimonic 80A: tensile strength and yield strength
| Mechanical Property | Nimonic 75 (Solid Solution) | Nimonic 80A (Precipitation Hardened) |
| Tensile Strength (Rm) | ≥ 685 MPa | ≥ 1000 MPa (Aged Condition) |
| Yield Strength (Rp0.2) | ≥ 275 MPa | ≥ 620 MPa (High Elasticity) |
| Elongation (A5) | ≥ 35% (High Plasticity) | ≥ 15% (Reduced Ductility) |
| Hardness (HBW) | ≤ 200 | 250 - 350 (After Aging) |
Nimonic 75 Advantage: Maximum formability and excellent weldability. Ideal for combustion liners.
Nimonic 80A Advantage: Ultra-high tensile strength and creep resistance. Essential for aerospace fasteners and valves.
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Nimonic 75 (GH3030/ Nicrofer 7520)
Nimonic 75 is an 80/20 nickel-chromium alloy with added titanium and carbon, offering good mechanical strength and oxidation resistance.
High-Temperature Performance: Excellent oxidation resistance up to 1100°C (2010°F), but its mechanical strength is best suited for medium temperatures (sustained temperatures up to 600-650°C).
Strengthening Mechanism: Solid solution strengthening, meaning it does not age harden and maintains stable mechanical properties.
Advantages: Excellent ductility, ease of machining and welding, and excellent corrosion resistance in oxidizing atmospheres make it ideal for furnace components, heat shields, and combustion chambers.
Typical Applications: Combustion chambers, furnace fixtures, and sheet metal components for gas turbines.
Nimonic 80A (GH4080A/UNS NO7080)
Nimonic 80A is a forged, age-hardening nickel-chromium alloy with added aluminum and titanium to form a precipitation-hardened structure (α phase).
High-Temperature Properties: Excellent creep rupture and tensile properties at temperatures up to 815°C (1500°F). It maintains high strength even under high stress.
Strengthening Mechanism: Precipitation hardening (aging) gives it significantly higher strength than Nimonic 75.
Advantages: Excellent creep resistance and high fatigue strength in harsh environments. It also has excellent oxidation resistance.
Typical Applications: Gas turbine blades, rings, discs, bolts, and automotive exhaust valves.
3. Why choose to source high-temperature alloys from Gnee Steel, a professional steel mill?
In the global high-temperature alloy materials supply market, we offer a "zero-risk" sourcing model for technical buyers:
Vacuum Ion Melting + Electroslag Remelting (VIM+ESR) process: Eliminates dissolved gases and inclusions, ensuring your H9 precision-ground bars are free of internal weak points.
Strict heat treatment control: We offer nickel-based 80A alloys in both "solution treated" (easier to machine) and "fully aged" (ready to use).
Global compliance: Every order comes with a complete EN 10204 3.1 factory test certificate (MTC).
Wholesale prices: Sourcing directly from Chinese high-temperature alloy factories saves 30-40% on costs compared to Western stockholders, while maintaining the same performance.
GH3030/Nimonic 75 certificate
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FAQ
Q1: Why does Nimonic 80A have much higher tensile strength than Nimonic 75?
A: It's all about the γ′ phase (Ni3(Al,Ti)). During the aging process, Aluminum and Titanium atoms form sub-microscopic precipitates that block dislocation movement. This is what boosts the strength from 685 MPa to over 1000 MPa.
Q2: Does your factory support third-party inspection (SGS/TUV)?
A: Absolutely. We welcome and facilitate third-party audits and material testing before shipment. We understand that for aerospace grade EI435/EI437 equivalents, trust is built on verified data.
Q3: What is the lead time for custom GH3030/GH4080A bar sizes?
A: We keep standard sizes in stock (Φ12mm - Φ100mm) for immediate global shipping. For custom forging or drawing runs, the lead time is typically 30-45 days.