inconel Alloy 625 VS inconel Alloy 601
inconel Alloy 625 VS inconel Alloy 601
Inconel 601 exhibits excellent high-temperature oxidation resistance and good strength, making it an ideal material for furnace components; while Inconel 625 possesses superior overall corrosion resistance (including resistance to pitting and crevice corrosion), higher strength at extreme temperatures, and is immune to chloride stress corrosion cracking due to its molybdenum and niobium content, making it more suitable for marine, aerospace, and chemical industries. If only high-temperature resistance/oxidation resistance is required, choose 601; but if both strength and corrosion resistance are needed in corrosive chemical/marine environments, choose 625.
Does Inconel 625 undergo work hardening?
Machining Inconel 625 is an extremely challenging task because this material has poor thermal conductivity, is prone to work hardening, and maintains its strength even at high temperatures. Due to its excellent corrosion and heat resistance, this superalloy is widely used in the aerospace and oil and gas industries.
Alloy 625 | N06625 | W.Nr. 2.4856 is a nickel-chromium-molybdenum alloy. It is known for its high strength and broad corrosion resistance. This alloy performs exceptionally well in a variety of corrosive media.
Alloy 601 (UNS N06601, EN 2.4851) is a nickel-chromium alloy characterized by the addition of aluminum. This gives it excellent corrosion resistance and performance in high-temperature oxidizing and carburizing environments.
Comparison of Alloy 625 and Alloy 601 grades
| Standard Body | Alloy 625 Designation | Alloy 601 Designation |
|---|---|---|
| UNS | N06625 | N06601 |
| EN | 2.4856 | 2.4851 |
| ASTM/ASME | B443, B444, B474, etc. | B166, B167, B168, etc. |
| GB (China) | NS3306 | NS3103 |
625 and 601 Alloy Products
Gnee Steel provides comprehensive solutions for nickel-based alloy piping materials, including pipes, fittings, flanges, and valves made of stainless steel, duplex steel, and alloy steel. We will customize the most suitable products for you. If you have any questions about our company and products, please feel free to contact us.
Chemical composition of Alloy 625 and Alloy 601
| Element | Inconel 601 | Inconel 625 |
|---|---|---|
| Nickel (Ni) | 58-63% | 58-72% |
| Chromium (Cr) | 21-25% | 20-23% |
| Iron (Fe) | Balance | Balance |
| Molybdenum (Mo) | None | 8-10% |
| Niobium (Nb) | None | 3.15-4.15% |
| Carbon (C) | ≤0.10% | ≤0.10% |
| Aluminum (Al) | 1.0-1.5% | None |
Alloy 625 vs Alloy 601: Key Differentiators
Main Advantages
Alloy 625 offers broad corrosion resistance and high strength. Alloy 601 is primarily used in high-temperature oxidizing environments and exhibits good resistance to carburization.
Key Alloying Elements
Alloy 625 contains high levels of molybdenum and niobium, which enhances its corrosion resistance. Alloy 601 contains aluminum and a small amount of molybdenum, which enhances its oxidation resistance.
Temperature limit
Both materials can withstand high temperatures. For continuous oxidizing environments up to 1200 °C (2200 °F), alloy 601 is generally preferred.
Corrosion Properties
Alloy 625 is more corrosion-resistant than other alloys and can withstand acids and chlorides. Alloy 601 performs well in dry, hot oxidizing environments, but its resistance to wet corrosion is poor.
Strength
Alloy 625 typically exhibits high strength at both room and elevated temperatures, while the performance of alloy 601 is more dependent on the protective effect of its oxide layer.
Mechanical properties of Inconel 601 and Inconel 625
| Property | Inconel 601 | Inconel 625 |
|---|---|---|
| Yield Strength (MPa) | 250 – 450 | 200 – 310 |
| Ultimate Tensile Strength (MPa) | 550 – 750 | 450 – 700 |
| Elongation (%) | 30% (min) | 30% (min) |
| Hardness (Rockwell B) | 85-95 | 85-100 |
High-Temperature Performance
| Feature | Inconel 601 | Inconel 625 |
|---|---|---|
| Service Temperature | Up to 2,100°F (1,149°C) | Up to 1,900°F (1,038°C) |
| Oxidation Resistance | Excellent | Excellent |
| Creep Resistance | Good | Very good |
Corrosion Resistance
| Corrosion Type | Inconel 601 | Inconel 625 |
|---|---|---|
| General Corrosion | Very good | Excellent |
| Pitting Corrosion | Good | Excellent |
| Stress Corrosion Cracking | Excellent | Excellent |
| Acid Resistance | Good in certain acids | Excellent in a broader range |
Typical Applications
| Application Area | Inconel 601 | Inconel 625 |
|---|---|---|
| Chemical Processing | Reaction vessels, heat exchangers | Equipment in chemical processing |
| Aerospace | Jet engine components | Aircraft engines and components |
| Oil and Gas Industry | Pipelines, valves | Offshore and downhole applications |
| Power Generation | Gas turbines | Heat exchangers and components |
| Industrial Furnaces | Furnace components | High-temperature furnace environments |
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@gneesteel.com for a quote.
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