When sourcing heavy-duty steel plates for furnace structural components or aerospace nozzles, one of the biggest challenges for engineers and purchasing managers is striking a balance between cost and performance.
The risks of GH3030: Prolonged use in environments exceeding 850°C may lead to excessive grain growth and loss of structural integrity.
The cost of GH3128: It is a high-quality alloy. Using it for simple heat shields operating below 700°C would be a waste of the procurement budget.
How to choose? Understanding the metallurgical differences between "reliable mainstay" (GH3030) and "high-stress dynamic steel" (GH3128) is key to ensuring industrial durability.
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GH3030 vs GH3128 Hot Rolled Plates | Choosing the Right High-Temperature Alloy
GH3030 vs GH3128 Hot Rolled Plates | Choosing the Right High-Temperature Alloy
GH3030 (nickel-based alloy) sheet is suitable for applications below 800°C, exhibiting excellent oxidation resistance and fatigue resistance, and is commonly used in combustion chambers. GH3128 alloy sheet possesses superior high-temperature creep strength, plasticity, and stability, making it more suitable for demanding long-term structural components operating above 800°C. Both are suitable for hot-rolled high-temperature structural component applications.
What is the heat capacity of NIMONIC 75?
NIMONIC alloy 75 can be hot worked in the range 1220- 950°C (2230-1740°F).
Chemical Composition Comparison: GH3030 vs. GH3128 (wt%)
| Element | GH3030 | GH3128 | Core Role & Difference Analysis |
|---|---|---|---|
| Nickel (Ni) | Balance (≥75.0) | Balance (≥60.0) | Matrix element. GH3128 has lower Ni content, allowing room for more solid-solution strengthening elements. |
| Chromium (Cr) | 19.0 – 22.0 | 19.0 – 22.0 | Essentially identical. Both rely on ~20% Cr for excellent oxidation and corrosion resistance. |
| Tungsten (W) | – | 7.5 – 9.0 | Key difference. Large W addition in GH3128 significantly enhances solid-solution strengthening and high-temperature strength. |
| Molybdenum (Mo) | – | 7.5 – 9.0 | Key difference. Works synergistically with W to further improve solid-solution strengthening and creep resistance. |
| Iron (Fe) | ≤ 1.5 | ≤ 1.5 | Both strictly limit Fe content to maintain nickel-based matrix characteristics. |
| Titanium (Ti) | 0.15 – 0.35 | 0.15 – 0.35 | Both contain trace Ti for supplementary solid-solution strengthening and stabilization. |
| Aluminum (Al) | ≤ 0.15 | ≤ 0.15 | Both strictly limit Al content to prevent formation of harmful phases. |
| Carbon (C) | ≤ 0.12 | ≤ 0.05 | GH3128 has lower C content, improving hot workability and weldability. |
| Manganese (Mn) | ≤ 0.70 | ≤ 0.50 | Deoxidizer; similar content. |
| Silicon (Si) | ≤ 0.80 | ≤ 0.80 | Deoxidizer; similar content. |
| Phosphorus (P) | ≤ 0.030 | ≤ 0.013 | GH3128 requires lower P content for improved cleanliness and toughness. |
| Sulfur (S) | ≤ 0.020 | ≤ 0.013 | GH3128 requires lower S content for improved hot workability and creep resistance. |
| Boron (B) | – | ≤ 0.012 | Trace strengthening element. B in GH3128 significantly improves grain boundary strength and stress rupture life. |
| Cerium (Ce) | – | ≤ 0.050 | Trace strengthening element. Ce in GH3128 purifies grain boundaries and improves oxidation resistance. |
1. Performance Comparison of GH3030 and GH3128
Although both are nickel-based alloys, their strengthening mechanisms are quite different. GH3030 uses chromium and titanium for solid solution strengthening, while GH3128 adds tungsten (W) and molybdenum (Mo) to improve its heat resistance.
| Feature | GH3030 (Nimonic 75 Equivalent) | GH3128 (Enhanced Superalloy) |
| Max Service Temp | 800°C (Up to 900°C intermittent) | 950°C - 1000°C |
| Strengthening Elements | Cr, Ni, Ti | Cr, Ni, W, Mo, Al, Ti |
| Oxidation Resistance | Excellent up to 800°C | Superior up to 950°C |
| Creep Strength | Moderate | High (W-Mo Reinforced) |
| Fabricability | Superior (Excellent welding/forming) | Good (Slightly harder to machine) |
| Cost Profile | Cost-effective Solution | Premium Grade Investment |
2. Comparison of mechanical properties between GH3030 and GH3128
| Property | GH3030 Plate | GH3128 Plate |
| Tensile Strength (σb) MPa | ≥ 590 | ≥ 735 |
| Yield Strength (σp0.2) MPa | ≥ 245 | ≥ 315 |
| Elongation (δ5) % | ≥ 35 | ≥ 35 |
| Density (g/cm³) | 8.4 | 8.8 (Heavier due to W content) |
Click to download the GH3030 alloy PDF file now
3. GH3030 and GH3128 Application Guide: How to Choose?
Selecting the right High-temperature Alloy Steel Plate depends on your specific industrial service environment:
Choose GH3030 for:
Combustion chamber liners and flame tubes.
Industrial furnace baffles and static thermal shields.
High-temperature fasteners and low-load structural parts.
Verdict: Use GH3030 when weldability and cost are the priority under 800°C.
Choose GH3128 for:
Aerospace engine nozzles and afterburner parts.
High-load industrial furnace structural members operating at 900°C+.
Components exposed to high-velocity hot gas erosion.
Verdict: Use GH3128 when structural integrity at 950°C is non-negotiable.
Why choose to source from Gnee Steel?
✅️Wholesale Inventory: We maintain a massive stock of both hot-rolled GH3030 and GH3128 plates (Thickness: 4mm to 50mm).
✅️Precision Processing: We offer a Cut-to-size service using precision laser and waterjet cutting to match your CAD drawings.
✅️Quality Assurance: Every plate is shipped with an EN 10204 3.1 Mill Test Certificate (MTC) and undergoes ultrasonic testing (UT).
✅️Direct Factory Price: Eliminate middleman markups and secure the best price for your project.
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
Contact us for the latest export price quote for GH3030 Alloy
FAQ
Q1: Which is better for thermal shields in a heat treatment furnace?
A: GH3030 is more cost-effective for static thermal shields and furnace liners where temperatures are kept under 800°C. It offers excellent oxidation resistance and is much easier to form into curved shapes.
Q2: Can GH3128 be welded to GH3030?
A: Yes. Both alloys have good weldability. We recommend using ERNiCr-3 or specialized GH3128 filler metals to ensure the joint maintains high-temperature stability.
Q3: Does GH3128 offer better corrosion resistance than GH3030?
A: In high-temperature oxidizing environments, GH3128 is superior due to its complex alloying. However, for general corrosion at room temperature, both perform similarly.
Q4: Do you offer trial orders for small plates?
A: Absolutely. We support prototype development and can provide small cut-to-size samples for material verification.
