Incoloy 825 seamless heat exchanger tubes
Incoloy 825 seamless heat exchanger tubes
Incoloy 825 tubing is a nickel-iron-chromium alloy with added molybdenum and copper. Its excellent resistance to oxidation, various acids (sulfuric and phosphoric acids), chloride-rich environments, and stress corrosion cracking make it an ideal choice for seamless heat exchanger tubing. This alloy is widely used in demanding applications such as radioactive waste disposal, chemical processing, marine exhaust emissions, and waste heat recovery. It performs well in both cryogenic and moderately high temperatures up to approximately 1000°F (540°C). Despite its excellent performance, Incoloy 825 tubing comes at a higher cost and requires careful handling to maintain its integrity.
What is the difference between Inconel 825 and SS316?
Incoloy 825 is well-suited for highly corrosive environments, high-temperature applications, or applications requiring resistance to stress corrosion cracking. SS316, on the other hand, is well-suited for applications requiring good resistance to general corrosion and pitting corrosion.
Chemical Composition of ASTM B163 Incoloy 825 Seamless Nickel Alloy tube
| Element | % | Element | % |
| Nickel | 38.0 – 46.0 | Carbon | 0.05 max |
| Chromium | 19.5 – 23.5 | Manganese | 1.0 max |
| Molybdenum | 2.5 – 3.5 | Sulfur | 0.03 max |
| Copper | 1.5 – 3.0 | Silicon | 0.5 max |
| Titanium | 0.6 – 1.2 | Aluminium | 0.2 max |
| Iron | 22.0 min (~33%) |
Mechanical Property of ASTM B163 Incoloy 825 Seamless Nickel Alloy tube
| Form | Condition | 0.2% Proof Stress MPa |
Tensile Strength MPa |
Elong % |
| Tube | Annealed | 440 | 770 | 35 |
| Tube | Cold drawn | 880 | 1000 | 15 |
| Bar | Annealed | 325 | 690 | 45 |
| Plate | Annealed | 340 | 660 | 45 |
| Sheet | Annealed | 420 | 760 | 39 |
ASTM B163 Incoloy 825 seamless tubing is a high-performance, corrosion-resistant product designed and manufactured to stringent standards for critical applications in heat exchangers, condensers, and demanding process environments where reliability under pressure and corrosive conditions is paramount. Incoloy 825's seamless construction and proven performance make it a cornerstone material for challenging industrial applications.
Sizes: Typically cover the widest range of OD and wall thickness combinations commonly used in heat exchanger tubing (e.g., OD from approximately 1/4 inch to over 3 inches, with wall thickness determined by gauge or BWG).
Condition: Typically supplied in the solution annealed condition (meeting the corrosion resistance requirements of ASTM B163).
Common Applications
Chemical Processing: Used in equipment for various chemical production and processing operations.
Waste Heat Recovery: Ideal for waste heat recovery exchangers and other high-temperature systems.
Marine and Nuclear Applications: Used in ship exhaust systems, radioactive waste disposal, and other nuclear processing applications.
Pollution Control: Used in wet scrubbers and other pollution control systems.
Mechanical Properties
Tensile Strength: After annealing, Incoloy 825 tubing has a minimum tensile strength of approximately 772 MPa.
Yield Strength: Annealed tubing typically has a minimum yield strength of approximately 441 MPa.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications. We also offer customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
