The difference between Inconel 600 pipes and Inconel 601 pipes
Gnee Steel
The difference between Inconel 600 pipes and Inconel 601 pipes
Both Inconel 600 and 601 seamless tubes are nickel-chromium alloys, but the key difference is that Inconel 601 alloy tubes contain added aluminum, giving them superior high-temperature oxidation and spalling resistance, while Inconel 600 tubes offer better overall corrosion resistance (e.g., resistance to chloride stress corrosion) and machinability, and are also less expensive. Therefore, 601 alloy tubes are ideal for extreme high-temperature environments (such as furnaces), while 600 alloy tubes are suitable for general high-temperature/corrosive environments (such as chemical processing).
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What is the standard pipe for Inconel 600?
These pipes conform to ASTM B167, B829, and B517 standard specifications. Pipe sizes vary according to ASTM, ASME, and API standards. Inconel 600 tubing is available in the following size ranges: seamless pipes with outside diameters from 4 mm to 219 mm, and welded and electric fusion welded pipes with outside diameters from 5 mm to 1219.2 mm, with wall thicknesses ranging from 0.5 mm to 20 mm.
Inconel 600 and 601 alloy tubes are among the most commonly used and popular alloys in the Inconel superalloy series. They are known for their exceptional corrosion resistance, strength, durability, and high-temperature performance. The main difference between the two is that Inconel 600 has a higher chromium content (minimum 15%), while Inconel 601 tubes have a higher nickel content (minimum 85%). Both alloys exhibit high tensile strength at extreme temperatures and can withstand temperatures up to 2200°F with little to no degradation in performance, making them ideal for various industrial applications such as cryogenic storage tanks, nuclear reactors, and gas turbines. Furthermore, they possess excellent formability, allowing them to be fabricated into complex shapes while maintaining their structural integrity and surface finish.
Chemical composition of Inconel 600 and 601 alloy tubes
| Element | Inconel 601 Tube (UNS N06601) | Inconel 600 Tube (UNS N06600) |
|---|---|---|
| Nickel (Ni) | 58.0 – 63.0 % | ≥ 72.0 % |
| Chromium (Cr) | 21.0 – 25.0 % | 14.0 – 17.0 % |
| Iron (Fe) | Balance | 6.0 – 10.0 % |
| Aluminum (Al) | 1.0 – 1.7 % | – |
| Carbon (C) | ≤ 0.10 % | ≤ 0.15 % |
| Manganese (Mn) | ≤ 1.0 % | ≤ 1.0 % |
| Silicon (Si) | ≤ 0.5 % | ≤ 0.5 % |
| Copper (Cu) | ≤ 1.0 % | ≤ 0.5 % |
| Titanium (Ti) | ≤ 0.15 % | – |
| Sulfur (S) | ≤ 0.015 % | ≤ 0.015 % |
Temperature Resistance:
One of the most important considerations when choosing Inconel 600 and Inconel 601 seamless tubes is their temperature resistance. Inconel 600 alloy tubes have a maximum operating temperature of 1150°C (2102°F), making them suitable for applications requiring high strength at high temperatures and excellent oxidation and carburization resistance. In contrast, Inconel 601 has a maximum operating temperature of 1200°C (2192°F), making it more suitable for applications requiring high temperature and corrosion resistance in sulfur-containing environments.
Corrosion Resistance:
Inconel 600 and Inconel 601 tubing both exhibit excellent corrosion resistance in a variety of environments. However, due to differences in chemical composition, their resistance to specific types of corrosion may vary. Inconel 600 tubing is resistant to sulfuric and hydrochloric acid corrosion, but may be susceptible to stress corrosion cracking in chloride environments. On the other hand, Inconel 601 tubing offers better resistance to stress corrosion cracking. It exhibits excellent corrosion resistance in sulfur-containing environments, making it an ideal choice for the chemical processing industry.
Welding and Fabrication:
Both Inconel 600 seamless tubes and Inconel 601 alloy tubes are easy to weld and fabricate. However, due to its lower nickel content, Inconel 601 tubing may be easier to form and machine. Furthermore, Inconel 601 tubing has higher oxidation resistance, therefore requiring less post-weld heat treatment, making it more cost-effective than Inconel 600 tubing.
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 601 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 601 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 601, 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.
