For aerospace and industrial furnace manufacturers, sourcing high-temperature steel sheets is a high-risk investment. Two of the most troublesome industrial challenges are:
Laser/plasma cutting head collisions: Residual stresses in conventional hot-rolled steel sheets can cause bending or warping. On automated CNC vacuum tables, this can lead to costly laser cutting head collisions, tool damage, and workpiece scrap.
Thermal limit softening: Using GH3030 (equivalent to Nimonic 75) in environments exceeding 850°C causes rapid grain growth and sagging, resulting in premature failure of furnace components.
At Gnee Alloy, we eliminate these risks. Our precision leveling process ensures "absolute flatness" in the steel sheets, maximizing your production uptime and ensuring structural integrity.
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Guide to Aerospace Grade GH3030 and GH3039 Hot-Rolled Steel Plates
Guide to Aerospace Grade GH3030 and GH3039 Hot-Rolled Steel Plates
GH3030 and GH3039 are high-quality solid solution strengthened nickel-chromium aerospace superalloys. These grades of hot-rolled sheets exhibit excellent high-temperature strength, oxidation resistance, and superior formability. They are key materials for manufacturing aircraft gas turbine combustors, afterburners, and high-temperature structural components.
Can GH3030 be used in sulfur-containing environments?
GH3030 performs best in oxidizing atmospheres (air/steam). If your environment has a high sulfur content, please contact our engineers for customized advice or an upgrade to Alloy 601.
Applications of GH3030 and GH3039 sheet metal properties
GH3030 (corresponding to UNS GH30 / XH78T)
Matrix composition: Approximately 80% nickel, approximately 20% chromium.
Maximum operating temperature: Up to 800°C.
Key characteristics: Stable single-phase austenitic structure. It exhibits excellent plasticity, resistance to thermal fatigue, and superior cold stamping and welding properties.
Main applications: Combustion chamber components, exhaust nozzles, and high-temperature furnace structural components.
GH3039 (equivalent to Inconel 713C or a similar nickel-chromium-aluminum alloy)
Main components: Nickel, chromium, and aluminum, with trace elements such as titanium and cobalt.
Maximum operating temperature: Up to 1100℃.
Key characteristics: Compared to GH3030, it offers higher creep resistance, superior high-temperature strength, and unparalleled oxidation resistance at extreme temperatures.
Main applications: Turbine blades, industrial gas turbine linings, and advanced combustion chambers.
3. Comparison of chemical composition of GH3030 and GH3039 plate(wt%)
| Element | GH3030 | GH3039 | Key Difference |
|---|---|---|---|
| Nickel (Ni) | Balance (≥ 75.0) | Balance (≥ 65.0) | GH3030 has higher Ni |
| 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 contains Mo |
| Niobium (Nb) | – | 0.90 – 1.30 | GH3039 contains Nb |
| Titanium (Ti) | 0.15 – 0.35 | 0.35 – 0.75 | GH3039 has higher Ti |
| Aluminum (Al) | ≤ 0.15 | 0.35 – 0.75 | GH3039 contains Al |
| Carbon (C) | ≤ 0.12 | ≤ 0.08 | GH3039 has lower C |
| Manganese (Mn) | ≤ 0.70 | ≤ 0.40 | GH3030 higher |
| Silicon (Si) | ≤ 0.80 | ≤ 0.80 | Same |
| Phosphorus (P) | ≤ 0.030 | ≤ 0.020 | GH3039 stricter |
| Sulfur (S) | ≤ 0.020 | ≤ 0.012 | GH3039 stricter |
| Copper (Cu) | ≤ 0.20 | ≤ 0.20 | Same |
| Cerium (Ce) | – | Allowed (trace) | GH3039 may contain Ce |
4. Comparison of room temperature mechanical properties of GH3030 and GH3039 sheet
| Property | GH3030 (Annealed) | GH3039 (Solution Treated) | Advantage |
|---|---|---|---|
| Tensile Strength, Ultimate (MPa) | ≥ 685 (99 ksi) | ≥ 735 (107 ksi) | GH3039 (~7% higher) |
| Tensile Strength, Yield (MPa) | ≥ 295 (43 ksi) | Not specified* | GH3030 has clear yield point |
| Elongation (%) | ≥ 30 | ≥ 40 | GH3039 |
| Reduction of Area (%) | ≥ 50 | – | – |
| Hardness (HBW) | ≤ 200 | Not specified | – |
| Modulus of Elasticity (GPa) | ~210 | ~196 | GH3030 stiffer |
| Density (g/cm³) | 8.4 | 8.3 | GH3039 slightly lighter |
Click to download the GH3030 alloy PDF file now
5. Advantages of Gnee Alloy VIM + ESR process
The quality of our Aerospace Grade plates is born in the furnace. We utilize a dual-refining strategy:
VIM + ESR process
VIM (Vacuum Induction Melting): Eliminates dissolved gases and ensuring a clean chemical base.
ESR (Electroslag Remelting): Acts as a liquid filter to remove inclusions, ensuring the plate surface is free from micro-pits after rolling.
Precision Leveling: We guarantee a flatness tolerance of ≤ 2mm/m, essential for seamless automated laser cutting.
6. Why choose a Tier 1 manufacturer like Gnee Alloy?
Direct Factory Pricing: Skip the 15-20% trading house markup and secure original mill rates.
Custom Fabrication: We offer precision Cut-to-Size services via laser, waterjet, or plasma to deliver blanks ready for your assembly line.
Full Traceability: Every sheet is delivered with an EN 10204 3.1 MTC documenting grain size (Level 8 or finer).
Wholesale Inventory: Large stock of thicknesses from 0.5mm to 50mm ready for Fast Global Shipping.
Gnee Alloy GH3030 certificate
Contact us now to get the latest export price for GH4169 in 2026
FAQ
Q1: Is GH3030 interchangeable with Nimonic 75 for my project?
A: Yes. GH3030 is a material used in Chinese standards to represent the equivalent of Nimonic 75/Alloy 75, both of which share the same metallurgical system. It is globally recognized as an ideal material for aerospace liners and industrial heat shields.
Q2: Can I weld GH3039 as easily as GH3030?
A: Both offer excellent weldability. However, GH3030 is the "Weld King" of nickel alloys due to its high ductility. GH3039 requires slightly more control over heat input but maintains superior weld-zone stability at 900°C.
Q3: Why should I choose a hot-rolled plate over cold-rolled for 10mm thickness?
A: For thicknesses above 4mm, hot-rolled plates offer a more Cost-effective Solution while maintaining excellent Industrial Durability. We then rough-grind the surface to ensure it meets your aesthetic and technical needs.
Q4: Do you support small trial orders for furnace prototype parts?
A: Absolutely. As a Reliable Supplier, we support Innovation. We offer Flexible MOQs on our in-stock inventory of sheets and plates.
