GH4169 and 310S Stainless Steel: A Guide to Heat Resistance
GH4169 and 310S Stainless Steel: A Guide to Heat Resistance
Both GH4169 and 310S stainless steels are excellent materials for high-temperature applications, but there are significant differences between them. GH4169 (Inconel 718) is a nickel-based superalloy designed to maintain extremely high strength at high temperatures (up to 650°C); while 310S stainless steel is an austenitic stainless steel designed to provide excellent oxidation resistance and structural stability at even higher temperatures (up to 1100°C–1150°C), but its strength is significantly lower than that of GH4169.
What is GH4169 equivalent to?
Inconel 718
GH4169 is a high-strength, nickel-based superalloy primarily used in aerospace and high-temperature applications. It is equivalent to: Inconel 718 (USA) Alloy 718 (UNS N07718)
1. Comparison of chemical composition (weight percentage) of GH4169 and 310S stainless steel
| Element | GH4169 (Inconel 718) | 310S Stainless Steel | Key Difference |
|---|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | 19.0 – 22.0 | GH4169 has ~2.5x higher Ni |
| Chromium (Cr) | 17.0 – 21.0 | 24.0 – 26.0 | 310S has higher Cr |
| Iron (Fe) | Balance (~18-20) | Balance (~52-55) | Both Fe-bearing, 310S higher |
| Molybdenum (Mo) | 2.80 – 3.30 | – | GH4169 unique |
| Niobium (Nb) | 4.75 – 5.50 | – | GH4169 unique – γ″ former |
| Titanium (Ti) | 0.65 – 1.15 | – | GH4169 unique |
| Aluminum (Al) | 0.20 – 0.80 | – | GH4169 unique |
| Carbon (C) | ≤ 0.08 | ≤ 0.08 | Similar |
| Manganese (Mn) | ≤ 0.35 | ≤ 2.0 | 310S higher |
| Silicon (Si) | ≤ 0.35 | ≤ 1.5 | 310S higher |
| Phosphorus (P) | ≤ 0.015 | ≤ 0.045 | GH4169 stricter |
| Sulfur (S) | ≤ 0.015 | ≤ 0.030 | GH4169 stricter |
| Nitrogen (N) | – | ≤ 0.10 | 310S unique |
| Boron (B) | 0.002 – 0.006 | – | GH4169 unique |
| Cobalt (Co) | ≤ 1.00 | – | – |
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GH4169 (UNS N07718) High Temperature Alloy
GH4169 is a precipitation-strengthened alloy designed for components requiring superior strength under high loads and temperatures.
Heat Resistance: Excellent overall performance over a temperature range of -253°C to 650°C. While it can withstand temperatures up to 850°C to 900°C for short periods, strength begins to decrease and oxidation increases.
Oxidation Resistance: A dense, protective chromium oxide film forms at temperatures up to 900°C. Strengthening Mechanism: Precipitation strengthening (γ) provides excellent tensile and creep strength.
Main Applications: Aerospace engine components, turbine blades, discs, and nuclear reactors.
310S Stainless Steel (1.4845 / UNS S31008)
310S is a low-carbon austenitic stainless steel designed for environments requiring superior heat resistance, particularly resistance to oxidation and high-temperature corrosion. Heat Resistance: Continuous use temperature up to 1100°C (2012°F) in air, intermittent use temperature up to 1035°C.
Oxidation Resistance: High chromium (24-26%) and nickel (19-22%) content forms an excellent protective oxide layer, giving it excellent oxidation resistance.
Weldability: Low carbon content (≤0.08%) makes 310S easy to weld and provides resistance to intergranular corrosion after welding.
Limitations: Prone to σ-phase embrittlement between 650°C and 900°C, which reduces toughness.
Main Applications: Furnace components, conveyor belts, heat treatment baskets, radiant tubes, and burner nozzles.
5. Mechanical property comparison between GH4169 and 310S (650°C / 1200°F)
| Feature | 310S Stainless Steel | GH4169 (Alloy 718) | Industrial Impact |
| Yield Strength (σp0.2) | **~ 130 - 150 MPa** | ≥ 850 MPa | GH4169 is 6x Stronger. |
| Tensile Strength (σb) | ~ 380 MPa | ≥ 1000 MPa | Elite pressure containment. |
| Creep Resistance | Poor (Prone to sagging) | Exceptional (Zero Deformation) | Vital for Structural Integrity. |
| Max Load Temp | 500°C (Limit for load) | 700°C (Stable Peak) | GH4169 for dynamic parts. |
| Oxidation Limit | 1035°C (Non-load) | 980°C (Non-load) | 310S is for "Shields" only. |
6. Choosing Between GH4169 and 310S stainless steel
If you are manufacturing non-load-bearing components, such as furnace baffles, fire shields, or low-pressure exhaust pipes, and their sole objective is to resist scaling at 1000°C, then choose 310S steel tubing.
If you are designing engine shafts, turbine discs, high-pressure gas lines, or structural fasteners, upgrade to GH4169 seamless steel tubing. GH4169 is an indispensable choice if the component must maintain its shape under pressure and high temperatures.
Contact our professionals to recommend the right alloy for your project
Why Partner with Gnee Alloy?
As a Reliable Supplier and specialized manufacturer, we eliminate procurement risks:
✅️Certified Quality: Fully compliant with AMS 5662 / AMS 5589 and ASTM standards.
✅️MTC 3.1 Traceability: Full heat analysis and high-temp tensile test reports provided.
✅️Wholesale Inventory: Large stock of standard schedules (Sch 40, Sch 80) ready for Fast Global Shipping.
✅️Custom Fabrication: Precision cutting, centerless grinding (h8-h11), and specialized bending services.
Gnee Steel GH4169 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 GH4169 Product Packing
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FAQ
Q1: Can I weld GH4169 to 310S stainless steel?
A: Yes. They have good metallurgical compatibility. We recommend using ERNiCr-3 filler metal. However, please note that the maximum load of the assembly will be limited by the weaker 310S side.
Q2: Is GH4169 equivalent to Inconel 718 for high-pressure service?
A: Absolutely. GH4169 is the technical equivalent of Inconel 718 (UNS N07718). Our material is globally interchangeable for all industrial and aerospace blueprints.
Q3: Why is GH4169 harder to machine than 310S?
A: GH4169 contains high levels of Niobium (Nb) and Molybdenum (Mo), leading to rapid work-hardening. However, we supply our tubes in the Solution Treated state to maximize your tool life during fabrication.
Q4: Do you offer bulk discounts for petrochemical refinery projects?
A: Yes. As a Tier-1 Manufacturer, we offer competitive Wholesale Pricing and tiered discounts for large-scale maintenance and construction projects.
