In the heat treatment and aerospace industries, GH3030 and GH3039 are often compared. They are both fundamental nickel-chromium superalloys, but their performance ranges are quite different.
Pain Point: Many purchasing teams default to GH3030 because it is a "standard" heat-resistant alloy. However, in environments exceeding 800°C or involving rapid thermal cycling, using GH3030 where GH3039 should be used can lead to premature thermal fatigue cracking and localized oxidation failure.
At Gnee Steel, we help you determine precise technology boundaries to ensure your equipment achieves the highest industrial durability.
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Comparison of GH3039 and GH3030 high-temperature fatigue resistant alloys
Comparison of GH3039 and GH3030 high-temperature fatigue resistant alloys
Both GH3039 and GH3030 are nickel-chromium based solid solution strengthened superalloys used in aero-engine components. GH3039 is generally superior to GH3030 in terms of thermal fatigue resistance and long-term stability, while both have excellent oxidation resistance, weldability, and moderate strength, with a maximum temperature range of 800°C to 1000°C.
What is GH3039 material?
GH3039 is a single-phase austenitic solid solution strengthened nickel-based alloy. Due to its excellent high-temperature strength, thermal fatigue resistance, and corrosion resistance at 850℃, it is the mainstream material for thermocouple protection tubes.
1. Chemical composition (by weight) of GH3039 and GH3030
| Element | GH3030 | GH3039 | Key Difference |
|---|---|---|---|
| Nickel (Ni) | Balance (≥ 75.0) | Balance (≥ 65.0) | GH3030 has higher Ni content |
| Chromium (Cr) | 19.0 – 22.0 | 19.0 – 22.0 | Identical |
| Iron (Fe) | ≤ 1.5 | ≤ 3.0 | GH3039 allows more Fe |
| Molybdenum (Mo) | – | 1.80 – 2.30 | GH3039 unique – solid-solution strengthener |
| Niobium (Nb) | – | 0.90 – 1.30 | GH3039 unique – forms γ′ phase |
| Titanium (Ti) | 0.15 – 0.35 | 0.35 – 0.75 | GH3039 higher |
| Aluminum (Al) | ≤ 0.15 | 0.35 – 0.75 | GH3039 contains significant Al |
| Carbon (C) | ≤ 0.12 | ≤ 0.08 | GH3039 lower |
| Manganese (Mn) | ≤ 0.70 | ≤ 0.40 | GH3030 higher |
| Silicon (Si) | ≤ 0.80 | ≤ 0.80 | Identical |
| Phosphorus (P) | ≤ 0.030 | ≤ 0.020 | GH3039 stricter |
| Sulfur (S) | ≤ 0.020 | ≤ 0.012 | GH3039 stricter |
| Copper (Cu) | ≤ 0.20 | ≤ 0.20 | Identical |
| Cerium (Ce) | – | Allowed (trace) | GH3039 may contain trace Ce |
Click to download the GH3030 alloy PDF file now
2. Room temperature mechanical properties of GH3039 and GH3030
| Property | GH3030 (Annealed) | GH3039 (Solution Treated) | Advantage |
|---|---|---|---|
| Tensile Strength, Ultimate | ≥ 685 MPa | ≥ 735 MPa | GH3039 (~7% higher) |
| Tensile Strength, Yield (0.2% Offset) | ≥ 295 MPa | Not specified* | GH3030 has clear yield point |
| Elongation at Break | ≥ 30% | ≥ 40% | GH3039 (more ductile) |
| Reduction of Area | ≥ 50% | – | GH3030 |
| Hardness (HBW) | ≤ 200 | Not specified | – |
| Modulus of Elasticity | ~210 GPa | ~196 GPa | GH3030 (stiffer) |
| Density | 8.4 g/cm³ | 8.3 g/cm³ | GH3039 slightly lighter |
3. Physical properties of GH3039 and GH3030
| Property | GH3030 | GH3039 |
|---|---|---|
| Density | 8.4 g/cm³ | 8.3 g/cm³ |
| Melting Range | 1374 – 1420°C | 1352 – 1375°C (approx.) |
| Thermal Conductivity (20°C) | 14 – 15 W/m·K | ~14.5 W/m·K |
| Coefficient of Thermal Expansion (20-100°C) | 12.8 × 10⁻⁶/°C | 11.5 × 10⁻⁶/°C |
| Coefficient of Thermal Expansion (20-800°C) | ~16.0 × 10⁻⁶/°C | ~15.5 × 10⁻⁶/°C |
| Specific Heat (20°C) | 460 – 500 J/kg·K | ~500 J/kg·K |
| Electrical Resistivity | 1.20 – 1.30 µΩ·m | ~1.25 µΩ·m |
| Magnetic Properties | Non-magnetic | Non-magnetic |
4. Advantages of GH3039 Compared to GH3030
GH3039 is technically an "evolution" of GH3030. GH3030 is a simple solid solution alloy, while GH3039 incorporates molybdenum (Mo) and aluminum (Al) into the matrix.
Advantages of Molybdenum: Molybdenum provides secondary solid solution strengthening, significantly improving the material's creep resistance and resistance to mechanical loads.
Advantages of Aluminum: Aluminum helps form a more stable oxide film and achieves slight precipitation hardening, extending the material's service life to 900°C.
Superior Thermal Fatigue Performance: GH3039 is specifically designed to withstand the stresses of continuous heating and cooling cycles, making it a preferred material for complex welded components.
Contact our professionals to recommend the right alloy for your project
5.Typical applications of GH3039 and GH3030
| Industry | GH3030 | GH3039 |
|---|---|---|
| Aerospace | Combustion chambers, afterburner components (lower stress) | Combustion chambers, afterburner components, transition ducts, flame holders |
| Gas Turbines | Combustor liners (moderate duty) | Combustor liners, transition pieces, heat shields |
| Heat Treatment | Furnace muffles, radiant tubes, retorts, baskets | High-temperature furnace fixtures, radiant tubes |
| Chemical Processing | Nitric acid equipment, heat exchangers | High-temperature reactor components |
| Power Generation | High-temperature ducts | Burner components, high-temperature ducting |
| Automotive | Exhaust manifolds, turbocharger housings | High-performance exhaust components |
Typical applications of GH3039
Typical applications of GH3030
6. Comprehensive comparison of GH3039 and GH3030
| Technical Feature | GH3030 (Foundational) | GH3039 (Upgraded) | Industrial Impact |
| Primary Elements | Ni, Cr, Ti | Ni, Cr, Mo, Al, Ti | GH3039 has a more complex matrix. |
| Strengthening Method | Solid Solution | Solution & Precipitation | GH3039 offers higher load capacity. |
| Max Service Temp | 800°C (1472°F) | 900°C (1652°F) | GH3039 handles +100°C extra heat. |
| Oxidation Resistance | Excellent up to 800°C | Superior up to 950°C | GH3039 resists scaling longer. |
| Fatigue Resistance | Moderate | High (Thermal Fatigue) | Choose GH3039 for cycling heat. |
| Relative Cost | Economical | Premium Investment | Match budget to performance. |
Why choose a Tier 1 supplier like Gnee Steel?
✅️VIM + ESR Melting: We utilize dual-vacuum refining to ensure ultra-low trace impurities, which is the key to maximizing the fatigue resistance of GH3039.
✅️Direct Factory Pricing: Save 15-20% by cutting out trading markups while securing Aerospace Grade quality.
✅️Wholesale Inventory: Massive stock of GH3030 and GH3039 sheets, plates, and tubes ready for Fast Global Shipping.
✅️Full Traceability: Every shipment includes an EN 10204 3.1 Mill Test Certificate (MTC).
Gnee Steel GH3030 Certificate
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel GH3030 Product Packing
Contact us for the latest export price quote for GH3030 Alloy
FAQ
Q1: Can I replace GH3030 with GH3039 in my existing design?
A: Yes. GH3039 is a superior material in almost every metric. It provides a higher safety factor and longer service life. The only trade-off is the higher initial material cost.
Q2: Which one has better weldability for complex manifolds?
A: Both offer excellent weldability. However, GH3030 is slightly more ductile in the as-welded state. For GH3039, we recommend specialized filler metals to ensure the weld zone matches the base metal's high-temp fatigue strength.
Q3: Does GH3039 offer better resistance to sulfur-containing gases?
A: Both alloys perform best in oxidizing atmospheres. If your environment contains high sulfur at extreme heat, please contact our engineers for a custom coating recommendation or a specialized alloy like Alloy 601.
Q4: Do you offer cut-to-size services for these plates?
A: Absolutely. We offer precision laser and waterjet Cut-to-Size services to deliver ready-to-install components based on your blueprints.
