Nickel 601 round bar vs. 718 nickel alloy round bar
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Nickel 601 round bar vs. 718 nickel alloy round bar
Due to its aluminum content, Nickel Alloy 601 round bar exhibits excellent high-temperature oxidation resistance, making it ideal for furnace components. Nickel Alloy 718 bar, on the other hand, thanks to the addition of niobium/columbium (Cb) and molybdenum (Mo), maintains exceptional strength, hardness, and creep resistance at high temperatures (approximately 1300°F/704°C), making it highly suitable for jet engines and gas turbines. The main difference between the two is that 601 alloy bar focuses on extremely high heat/oxidation resistance (e.g., for furnace components), while 718 alloy bar focuses on strength performance in aerospace applications, although 718 alloy round bar also possesses good oxidation resistance while maintaining high strength.
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What is the difference between Inconel 600 and INCONEL 601?
Inconel 600 and 601 are both high-temperature nickel alloys, but Inconel 601 contains added aluminum, giving it superior high-temperature oxidation and carburization resistance, making it ideal for furnace applications. Inconel 600, on the other hand, offers broader general corrosion resistance, better resistance to chloride stress corrosion cracking, and lower cost, making it suitable for chemical processing and marine environments. The main difference lies in the higher aluminum content of 601, which improves its thermal stability, while 600 provides a general and cost-effective solution for non-extreme conditions, although 601 also exhibits higher creep strength.
Chemical composition of Inconel 601 rods and Inconel 718 round bars
| Element | Inconel 601 Rod (UNS N06601) | Inconel 718 Round Bar (UNS N07718) |
|---|---|---|
| Nickel (Ni) | 58.0 – 63.0 % | 50.0 – 55.0 % |
| Chromium (Cr) | 21.0 – 25.0 % | 17.0 – 21.0 % |
| Iron (Fe) | Balance | Balance |
| Aluminum (Al) | 1.0 – 1.7 % | 0.20 – 0.80 % |
| Titanium (Ti) | ≤ 0.15 % | 0.65 – 1.15 % |
| Niobium (Nb) | – | 4.75 – 5.50 % |
| Molybdenum (Mo) | – | 2.80 – 3.30 % |
| Cobalt (Co) | – | ≤ 1.00 % |
| Carbon (C) | ≤ 0.10 % | ≤ 0.08 % |
| Manganese (Mn) | ≤ 1.0 % | ≤ 0.35 % |
| Silicon (Si) | ≤ 0.5 % | ≤ 0.35 % |
| Copper (Cu) | ≤ 1.0 % | ≤ 0.30 % |
| Sulfur (S) | ≤ 0.015 % | ≤ 0.015 % |
| Phosphorus (P) | – | ≤ 0.015 % |
| Boron (B) | – | ≤ 0.006 % |
| Tantalum (Ta) | – | ≤ 0.05 % |
Physical properties of Inconel 601 rods and Inconel 718 round bars
| Physical Property | Inconel 601 Rod (Annealed) | Inconel 718 Round Bar (Aged) |
|---|---|---|
| Density (g/cm³) | 8.11 | 8.19 |
| Melting Range (°C) | 1300 – 1370 | 1260 – 1336 |
| Modulus of Elasticity (GPa) | 210 | 205 |
| Thermal Conductivity (W/m·K, at 20°C) | 11.2 | 11.4 |
| Coefficient of Thermal Expansion (×10⁻⁶/K, 20–100°C) | 12.6 | 13.0 |
| Electrical Resistivity (μΩ·m, at 20°C) | 1.18 | 1.25 |
| Specific Heat (J/kg·K, at 20°C) | 444 | 435 |
| Magnetic Permeability | Typically non‑magnetic | Slightly magnetic (due to iron content) |
| Poisson's Ratio | 0.29 | 0.30 |
| Thermal Diffusivity (mm²/s, at 20°C) | ~3.2 | ~3.1 |
Inconel 601 Round Bar (UNS N06601)
Key Features: Excellent oxidation and carburization resistance at high temperatures due to the presence of aluminum.
Composition: High nickel/chromium alloy with added aluminum (Al).
Best Uses: Furnace components, radiant tubes, heat treatment equipment, petrochemical processing, and resistance heating elements.
Performance: Good mechanical strength at high temperatures and good machinability (compared to 718 alloy).
Inconel 718 Alloy Bar (UNS N07718)
Key Features: Excellent strength, toughness, and creep resistance at temperatures up to approximately 650°C (1200°F) through age hardening treatment.
Composition: Nickel-chromium-iron alloy with added niobium (Nb) and molybdenum (Mo).
Best Uses: Jet engine components (impellers, fasteners, blades), high-speed aircraft airframes, gas turbines, and aerospace fasteners.
Performance: Extremely high strength, good weldability, but difficult to machine due to work hardening.
When to choose which type of round bar:
If your application involves continuous exposure to extremely high temperatures and corrosive gases (such as internal furnace components), and your primary concern is oxidation resistance, choose alloy 601.
If you require high tensile strength, durability, and creep resistance under high stress, such as for jet engine components, and can accommodate more complex manufacturing processes, choose alloy 718.
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel 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
About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
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