Are you tired of frequent downtime due to furnace lining deformation, cracking, or scaling? If you're currently using 310S stainless steel in applications at or near 800°C, you may have reached the physical limits of this iron-based alloy.
While 310S is a commonly used heat-resistant steel, it tends to fail prematurely under high-stress thermal conditions. It's time to consider a material upgrade. Our Gnee Steel GH3030 (Nimonic 75 / XH78T) nickel alloy steel sheet offers a superior alternative solution, albeit with a higher initial cost, but delivers significant long-term cost savings through extended service life and reduced maintenance.
Comparison of price and lifespan data between GH3030 and 310S
GH3030 alloy and 310S stainless steel sheet: the best choice for 800°C high-temperature furnaces
GH3030 alloy and 310S stainless steel sheet: the best choice for 800°C high-temperature furnaces
Both GH3030 and 310S stainless steels are high-temperature resistant materials used in industrial applications, but they differ significantly in composition, maximum operating temperature, and cost. GH3030 is a nickel-based superalloy (with a nickel content of approximately 72%–80%), exhibiting excellent heat resistance and structural stability at extreme temperatures; while 310S is an austenitic stainless steel (with a chromium content of 25% and a nickel content of 20%), possessing excellent oxidation resistance and good performance at medium to high temperatures.
What are the components of GH3030?
GH3030 is a solid solution strengthened superalloy, primarily composed of nickel (Ni) and chromium (Cr), typically with 80% Ni and 20% Cr. This simple yet efficient alloy system provides excellent mechanical and chemical stability even under harsh conditions.
1.Comparison of chemical composition (weight percentage) of GH3030 alloy and 310S stainless steel
| Element | GH3030 (Superalloy) | 310S (Stainless Steel) |
| Nickel (Ni) | Balance (~80.0%) | 19.0 - 22.0% |
| Chromium (Cr) | 19.0 - 22.0% | 24.0 - 26.0% |
| Iron (Fe) | ≤ 1.5% | Balance |
| Titanium (Ti) | 0.15 - 0.35% | - |
| Carbon (C) | ≤ 0.12% | ≤ 0.08% |
2.Mechanical and physical properties of GH3030 alloy and 310S stainless steel
| Property | GH3030 Plate | 310S Plate |
| Material Base | Nickel-Base (Premium) | Iron-Base (Standard) |
| Density | 8.4 g/cm³ | 7.98 g/cm³ |
| Tensile Strength (σbσb) | ≥ 735 MPa | ≥ 520 MPa |
| Yield Strength (σ0.2σ0.2) | ≥ 245 MPa | ≥ 205 MPa |
| Operating Limit | 800°C (High Load) | 800°C (Low/No Load) |
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3. Advantages of GH3030 Compared to 310S Stainless Steel at 800°C
The Dilemma of 310S Steel: As an iron-based austenitic steel, 310S steel becomes brittle after prolonged exposure to high temperatures of 600°C-900°C. This causes the steel sheet to lose its "plasticity" and undergo catastrophic cracking under thermal shock. Furthermore, its oxide scale frequently flakes off, contaminating the furnace environment.
The Solution of GH3030: As a nickel-based superalloy, GH3030 steel maintains its face-centered cubic (FCC) structure and does not form brittle phases. It has superior resistance to thermal fatigue, ensuring that the steel sheet maintains good ductility and structural integrity for years rather than months.
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3. Key Differences Between GH3030 Alloy and 310S Stainless Steel
Oxide Film Adhesion:Compared to 310S, GH3030's high nickel content results in a stronger oxide film with "self-healing" capabilities.
Processing Advantages:GH3030 is renowned for its high plasticity. Our cold-rolled sheets (0.5mm - 4.0mm) can be complexly formed, while our hot-rolled sheets (5mm - 50mm) are easy to weld and do not exhibit the common risk of hot cracking found in high-alloy steels.
Purity:Our GH3030 is produced using VIM (Vacuum Induction Melting) + ESR (Electroslag Remelting) processes, resulting in a "clean" metal free of inclusions-a standard rarely achieved by commercial 310S.
VIM (Vacuum Induction Melting) + ESR (Electroslag Remelting) processes
4. Economic Benefits of GH3030 vs. 310S
Gnee Steel, as a reliable supplier, offers cost-effective solutions at factory wholesale prices.
310S Costs: Low initial price + 3 replacements per year + labor costs + production losses.
GH3030 Costs: Higher initial price + replacement every 2-3 years + zero unplanned downtime.
Contact us now to get the latest export price for GH3030 in 2026
5.GH3030 vs 310S Comparison Summary
| Feature | GH3030 Alloy Sheet | 310S Stainless Steel Sheet |
|---|---|---|
| Material Base | Nickel-based (Superalloy) | Iron-based (Stainless Steel) |
| Max Temp (Cont.) | 1000°C - 1100°C | Up to 1100°C |
| High-Temp Strength | Excellent (High Load) | Good (Moderate Load) |
| Corrosion Resistance | Superior (Oxidation) | Very Good (Oxidation/Sulfidation) |
| Cost | High (Nickel-intensive) | Moderate |
| Best Application | Extreme heat + stress (Aero) | High heat + corrosion (Furnace) |
When to choose which steel? For aircraft engines, gas turbines, and harsh thermal cycling environments requiring high structural strength, choose GH3030. For furnace linings, heat exchanger tubes, and petrochemical equipment requiring excellent oxidation resistance and lower cost, choose 310S.
Contact our professionals to recommend alloys suitable for your project
Contact us for a quote on high-performance GH3030 tubing!
Stop paying exorbitant prices for Western brands. We can offer you the same aerospace-grade GH3030 superalloy tubing at a lower price. Our team is ready to provide you with a rapid quote (RFQ) within 12 hours.
Email: [ru@gneesteelgroup.com]
WhatsApp/WeChat: +86 15824687445
Website: [https://www.china-plate-steel.com/]
FAQ
Q1: Can I weld GH3030 directly to my existing 310S structure?
A: Yes. GH3030 has excellent Weldability and can be joined to stainless steels using nickel-based filler metals (like ERNiCr-3). This makes it a perfect Replacement Solution for localized upgrades.
Q2: Is the surface quality of GH3030 plate suitable for precision parts?
A: Absolutely. We offer Bright Annealed (BA) finishes for cold-rolled sheets, ensuring a mirror-like, scale-free surface that is ideal for precision aerospace and furnace components.
Q3: What sizes do you have in stock?
A: We are a Large Scale Factory in China, maintaining a Large Stock of cold-rolled sheets (0.5-4mm) and hot-rolled plates (5-50mm). We also offer Custom Sizes via precision laser and waterjet cutting.
Q4: Does GH3030 comply with international standards?
A: Yes, our GH3030 is fully equivalent to Nimonic 75 and XH78T. We provide an EN 10204 3.1 Material Certification with every order to guarantee Premium Quality.
