In aerospace and industrial heating applications, short-term data is far from sufficient. You need to understand how materials perform under sustained thermal stress for months on end. Detailed performance characteristics of the GH3030 nickel alloy demonstrate that its microstructure remains exceptionally stable even after more than 1000 hours of operation at 800°C (1472°F). Consult our authoritative heat resistance data to verify whether GH3030 is suitable for your next-generation furnaces, aero-engines, or nuclear power projects.
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Performance characteristics of GH3030 nickel alloy
Performance characteristics of GH3030 nickel alloy
GH3030 (also known as GH30 or XH78T) is an early-developed solid-solution strengthened nickel-based superalloy with approximately 80% nickel and 20% chromium content, designed specifically for high-temperature stability and oxidation resistance. It is primarily used in aerospace and industrial applications to manufacture components operating at temperatures below 800°C to 1100°C.
What is the hardness of NIMONIC 75?
Nimonic 75 is a nickel-based heat-resistant superalloy (HRSA) material with a machinability grade of 17% and a hardness of 90 HRB.
1. Mechanical properties of GH3030 material (standard properties and high-temperature properties)
| Property | Room Temperature (20°C) | High Temperature (800°C) |
| Tensile Strength (Rm) | ≥ 685 MPa | ≥ 210 MPa (Stable) |
| Yield Strength (Rp 0.2) | ≥ 275 MPa | ≥ 120 MPa |
| Elongation (A5) | ≥ 35% (Excellent) | ≥ 45% (High Plasticity) |
2. Chemical composition of GH3030 alloy
| Composition | Benefit | |
|---|---|---|
| Nickel (Ni) | Balance (≥ 75.0%) | Ensures a stable austenitic matrix |
| Chromium (Cr) | 19.0 - 22.0% | Provides high-temperature oxidation resistance |
| Titanium (Ti) | 0.15 - 0.35% | Refines grain size and prevents thermal embrittlement |
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3. Key Performance Characteristics of GH3030 Alloy
High-Temperature Strength: It possesses satisfactory high-temperature strength, maintaining stability and structural integrity at temperatures up to 800°C–900°C, and is suitable for applications requiring oxidation resistance but with low loads up to 1100°C.
Oxidation Resistance: Due to its high-nickel-chromium matrix, it exhibits excellent oxidation resistance, especially at high temperatures.
Microstructure Stability: After solution treatment, this alloy presents a single-phase austenitic structure, remaining stable during long-term high-temperature service.
Excellent Machinability: It possesses high plasticity, suitable for cold stamping, and exhibits good cold and hot working properties.
Weldability: It has good weldability and can be used in various welding processes to manufacture complex parts.
High Thermal Fatigue Resistance: It performs excellently under conditions requiring high fatigue resistance and thermal cycling resistance.
4. Common Applications of GH3030 Alloy
GH3030 is commonly used in environments requiring high heat resistance and oxidation resistance, including:
Aerospace: Turbine engine combustion chamber components.
Industrial: Afterburners, combustion chambers, and hot-end components (including housings).
Chemical Processing: High-temperature containers and structural components.
5.Comparison of the solid solution stability of GH3030 and GH4169 age-hardening alloy
| Feature | GH3030 (Solid-Solution) | GH4169 (Precipitation-Hardened) |
| Microstructure | Extremely Stable (Single Phase) | Metastable (Phase transformation risk) |
| 800°C Ductility | Maintains High Plasticity | Rapidly loses ductility above 700°C |
| Long-term Risk | Zero "Age-Embrittlement" | High risk of over-aging & cracking |
| Best For | Burners / Combustion Parts | Rotating Discs / High-Stress Bolts |
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6. GH3030 Quality Assurance
In the global high-temperature alloy materials supply market, the value of data depends on the certifications behind it.
100% Traceability: Every bar, plate, or tube is marked with a heat number.
Certification Standards: Complies with GB/T 14992, Nimonic 75, and EI435 (ЭИ435) standards.
Non-destructive Testing: Each batch undergoes ultrasonic and eddy current testing to ensure no internal voids.
MTC 3.1: Available with all high-temperature alloy wholesale export products.
Gnee Steel GH3030 certificate
FAQ
Q1: What happens to GH3030 after 1000 hours at 800°C?
A: Our lab tests show that the grain size remains stable (Grade 5-8), and there is virtually no precipitation of harmful phases (like Sigma phase). The material maintains its oxidation resistance and high elongation, ensuring it won't crack under thermal cycling.
Q2: Does GH3030 lose its "Bright finish" at high temperatures?
A: In an oxidizing atmosphere, all nickel alloys form a protective oxide layer. However, GH3030's oxide scale is extremely thin and tightly adherent, preventing "spalling" (flaking) which is common in inferior 300-series steels.
Q3: What is the typical lead time for a wholesale GH3030 order?
A: We maintain a large inventory in stock for standard pipes and bars, allowing for immediate global shipping (7-10 days). Custom production runs typically take 30-45 days.