ASTM B407 incoloy 800HT nickel alloy large diameter bright annealed seamless pipe
Gnee Steel
ASTM B407 incoloy 800HT nickel alloy large diameter bright annealed seamless pipe
ASTM B407 specifies seamless pipe made from Incoloy 800H and 800HT (nickel-iron-chromium alloys). While the standard covers seamless pipe, suppliers must also meet specific requirements for "large diameter," "bright annealing," and other special properties.
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What is the difference between Incoloy 800 and 800H?
Incoloy 800 has a lower carbon content, typically around 0.05%, while Incoloy 800H has a higher carbon content, ranging from 0.05% to 0.10%. The higher carbon content of 800H improves its strength, making it more suitable for high-temperature applications.
Incoloy 800HT, composed of nickel, iron, and chromium, is suitable for high-temperature structural applications. Incoloy 800HT pipe offers good strength and excellent corrosion resistance. At high temperatures, Incoloy 800HT pipe exhibits excellent resistance to carburization and oxidation. ASTM B407 UNS N08811 material is very similar to other nickel alloys, except that it contains higher levels of carbon, aluminum, and titanium. The nickel content in Alloy 800HT pipe provides strong resistance to chloride stress corrosion and embrittlement. Solution-annealed Incoloy 800HT seamless pipe is known for its stress rupture and creep strength.
ASTM B407 UNS N08811 Chemical Composition:
| 800HT | Ni | C | Mo | Mn | Si | Fe | P | S | Co | Cr |
| 30-35 | 0.06-0.1 | / | 1.5 |
1 |
39.5Min | / | 0.015Max | / | 19-23 |
ASTM B407 UNS N08811 Mechanical Properties:
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.0 g/cm3 | 1357-1385 °C (2475-2525 °F) | Psi – 25,000 , MPa – 172 | Psi – 65,000 , MPa – 448 | 30 % |
| ASTM/ ASME Specification | ASTM B407/ASME SB 407, ASTM B163/ ASME SB163 , ASTM B515 / ASME SB 515 Standard Specification for Incoloy Alloy 800HT Seamless & Welded Superheater, Condenser, Hydraulic, Boiler and Heat-Exchanger Tubes |
| Shapes | 800HT Incoloy Round, Rectangular, Square, Hydraulic, Straight, "U" Shape, Coiled, Honed Tubes, Pan Cake Coils |
| Manufacturing Type | Seamless / ERW / Welded / Fabricated / CDW / CDS / DOM / CEW / 100% X Ray Welded |
| Thickness Range | SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXH, SCH XXS, SCH XS |
| Swg & Bwg | 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg. |
| Standard | SUS, JIS, AISI, ASTM, GB, DIN, EN |
| Delivery Condition | Annealed and Pickled (AP), Polished, Bright Annealed (BA), Cold Drawn, MF |
| Value Added Services |
Cutting Beveling Threading Draw & Expansion as per required Size & Length Ultrasonic Testing Annealed & Pickled Bending Destructive and Non Destructive |
| END | Plain End, Beveled End, Treaded Incoloy UNS N08811 Tube |
| Processing Service | Bending, Welding, Decoiling, Punching, Cutting, Moulding |
| Technique | ASTM B407 Incoloy 800HT Cold drawn, Cold rolled, Hot rolled, Extrusion Tube |
| Marking |
Specification Material Grade Nominal Size Schedule or Wall Thickness Method of Manufacturing (Seamless / Welded) Heat Number Manufacturer's Name or Custom Logo - on request Marked Sample: ASTM B407 UNS N08811 Seamless 113.60 mm OD x 6 mm W.T. HEAT No. xxxxxx |
Incoloy 800HT and ASTM B407 Specifications
ASTM B407: This standard specifies seamless nickel-iron-chromium-based alloy pipe for general corrosion and heat-resistant applications. It specifically covers grades 800, 800H, and 800HT.
Incoloy 800HT (UNS N08811): This is a version of Incoloy 800 that has been specially treated to enhance creep and rupture resistance at elevated temperatures (typically above 1100°F (593°C)). Its chemical composition is carefully controlled, with particular emphasis on aluminum and titanium content.
Seamless Pipe: This type of pipe is formed from a solid piece of metal that is extruded or perforated to create a hollow tube. It lacks welds, resulting in increased strength and integrity, making it suitable for high-pressure and high-temperature applications.
Special Features and Availability
Large Diameter: "Large diameter" is not a standard size in the ASTM B407 specification but is defined by the manufacturer or supplier. Standard seamless sizes under ASTM B407 typically extend up to 6 inches (nominal inside diameter, NB), so larger sizes are considered custom orders and may be supplied by specialized fabricators.
Bright annealing: This refers to the final heat treatment and finishing of the pipe. Bright annealing is a process performed in a controlled atmosphere furnace to produce a clean, reflective, bright finish on the inside and outside of the pipe, free of oxidation. Suppliers may offer this finish, but it is not a default requirement under the ASTM standard.
Typical Applications
Large-diameter, bright-annealed Incoloy 800HT seamless pipe is suitable for applications requiring high-temperature strength, creep resistance, and a clean, corrosion-resistant surface. These applications may include:
Heat exchangers
Heat treatment equipment
Chemical and petrochemical processing plants
Power and nuclear power plants
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, and we can provide customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneemetal.com.
