Difference between Inconel 600 alloy bars and Inconel 625 round bars
Difference between Inconel 600 alloy bars and Inconel 625 round bars
Both Inconel 600 and 625 are nickel-chromium alloys, but due to its higher chromium and molybdenum content, Inconel 625 offers superior corrosion resistance (especially in seawater and acidic environments), strength, and weldability. Inconel 600 is more economical and suitable for high-temperature applications where corrosion resistance is sufficient; while Inconel 625 offers higher performance but is also more expensive, making it suitable for more demanding conditions.
What is Alloy 625?
Alloy 625 is a nickel-chromium-molybdenum-niobium alloy renowned for its high strength and excellent corrosion resistance, making it particularly suitable for marine, chemical, and high-temperature environments. Its composition contains at least 58% nickel, 20% chromium, and 8% molybdenum, enabling it to resist a variety of corrosive environments, including chloride-induced stress corrosion cracking, pitting corrosion, and crevice corrosion. It is widely used in industries such as aerospace, oil and gas, and nuclear power, and can be machined, welded, and rotated.
Chemical Composition comparison of Nickel Alloy 600 Bar and Nickel Alloy 625 Bar
| Element | Nickel Alloy 600 | Nickel Alloy 625 | Key Difference |
|---|---|---|---|
| Nickel (Ni) | ≥ 72% | 58% minimum | Alloy 600 has a higher nickel content. |
| Chromium (Cr) | 14-17% | 20-23% | Alloy 625 has more chromium for better corrosion resistance. |
| Molybdenum (Mo) | - | 8-10% | Present in Alloy 625, improving pitting resistance. |
| Iron (Fe) | 6-10% | ≤ 5% | Lower in Alloy 625, reducing magnetism and corrosion. |
| Cobalt (Co) | ≤ 1.0% | ≤ 1.0% | Similar content in both. |
| Manganese (Mn) | ≤ 1.0% | ≤ 0.5% | Slightly lower in Alloy 625. |
| Silicon (Si) | ≤ 0.5% | ≤ 0.5% | Similar content. |
| Carbon (C) | ≤ 0.15% | ≤ 0.10% | Lower in Alloy 625 for better weldability. |
| Niobium (Nb) | - | 3.15-4.15% | Present in Alloy 625, adding strength. |
Mechanical Properties
| Property | Nickel Alloy 600 | Nickel Alloy 625 | Key Difference |
|---|---|---|---|
| Tensile Strength | 550 MPa (min) | 827 MPa (min) | Alloy 625 has significantly higher strength. |
| Yield Strength | 240 MPa (min) | 414 MPa (min) | Alloy 625 offers better yield strength. |
| Elongation | 30% | 30% | Both alloys offer good ductility. |
| Hardness (Brinell) | 150 | 180 | Alloy 625 is harder and more durable. |
Corrosion Resistance
Nickel Alloy 600:
It exhibits excellent resistance to oxidation and high-temperature corrosion.
Suitable for dry gas, chloride, and oxidizing environments.
Compared to Alloy 625, its resistance to pitting and crevice corrosion is limited.
Nickel Alloy 625:
Excellent corrosion resistance, especially in seawater, chloride-containing environments, and acidic media.
The addition of molybdenum and niobium enhances its resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking.
Temperature Resistance
| Temperature Range | Nickel Alloy 600 | Nickel Alloy 625 |
|---|---|---|
| Continuous Service | Up to 1100°C (2000°F) | Up to 980°C (1796°F) |
| Cryogenic Temperatures | Good | Excellent |
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
Gnee Steel is a supplier of Inconel 625 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Inconel 625 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Inconel 625, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
