ASTM B407 UNS N08810 Alloy pipes for pressure vessels
ASTM B407 UNS N08810 alloy tubing is a nickel-iron-chromium alloy known for its excellent high-temperature strength and corrosion resistance, making it suitable for pressure vessels and other applications in high-temperature corrosive environments. Key properties include resistance to oxidation and carburization, enhanced high-temperature creep and rupture properties, and good machinability. Proper processing requires adherence to the specific chemical composition limits, heat treatment (annealing), and testing requirements specified in the ASTM B407 standard.
What is the heat treatment for 800 alloy?
800H/800HT alloys are typically heat treated at temperatures between 1121-1177°C (2050-2150°F). In addition to softening the material after forming, this heat treatment also aims to create larger grains, thereby improving resistance to creep and stress rupture.
Incoloy 800H Alloy Steel Seamless Pipe Chemical Composition
| Element | Content (%) |
| Iron, Fe | ≥39.5 |
| Nickel, Ni | 30-35 |
| Chromium, Cr | 19-23 |
| Manganese, Mn | ≤1.5 |
| Others | Remainder |
Incoloy 800H Alloy Steel Seamless Pipe Physical Properties
| Properties | Metric | Imperial |
| Density | 7.94 gm/cm3 | 0.287 lb/in3 |
Incoloy 800H Alloy Steel Seamless Pipe Mechanical Properties
| Properties | Metric | Imperial |
| Tensile strength(annealed) | 600 MPa | 87 ksi |
| Yield strength(annealed) | 275 MPa | 39.9 ksi |
| Elongation at Break | 45% | 45% |
Incoloy 800H Alloy Steel Seamless Pipe Hot working
| Incoloy Alloy 800H | 1100 Deg F (593°C) to 1800°F (982°C) |
Fabrication and Testing
Heat Treatment: Pipes must be heat treated at a specified annealing temperature and then cooled (typically in air) to achieve the required properties.
Tensile and Mechanical Properties: Mechanical properties, such as yield strength and tensile strength, vary depending on the heat treatment. They must meet specific minimum tensile strength (450 MPa), yield strength (170 MPa), and elongation (30%) requirements.
Testing: The standard requires specific testing, including tensile testing and the planar method for determining grain size. Hydrostatic or nondestructive eddy current testing is also required to ensure the pipe is defect-free.
Formats: Available in a variety of formats, including hot-finished or cold-finished seamless and welded pipe.
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.
