ASTM B366 N08810 Incoloy 800H Equal Tee

ASTM B366 N08810 Incoloy 800H Equal Tee is a factory-made wrought nickel alloy pipe fitting designed for branch connections in high-temperature piping systems.

The fitting is manufactured from UNS N08810 / Incoloy 800H, a nickel-iron-chromium alloy with controlled carbon and aluminum-titanium content for elevated-temperature applications. Incoloy 800H is commonly supplied for applications where temperature, oxidation, carburization and long-term mechanical performance are important considerations.

ASTM B366/B366M covers wrought nickel and nickel alloy fittings for pressure piping, including tees manufactured for butt-welding applications. WP fittings are associated with dimensional standards such as ASME B16.9 and B16.11.

The equal tee has three outlets with the same nominal pipe size and is used to create a 90-degree branch connection from the main piping run.

Product Specifications

Material: UNS N08810 / Incoloy 800H

UNS N08810 is commonly known as INCOLOY alloy 800H. It belongs to the nickel-iron-chromium alloy family.

The alloy has a nominal chemistry based on approximately:

The controlled carbon range and grain-size requirements distinguish 800H from standard Alloy 800. Special Metals identifies N08810 as INCOLOY alloy 800H and N08811 as INCOLOY alloy 800HT.

N08810 vs N08811

Manufacturing Process

The ASTM B366 N08810 equal tee can be manufactured through controlled hot forming and other permitted forming operations depending on the fitting size, wall thickness and construction class.

Typical manufacturing stages include:

1. Nickel alloy raw material inspection
2. Material identification and heat traceability
3. Cutting
4. Hot forming / shaping
5. Tee branch forming
6. Heat treatment
7. End bevel machining
8. Dimensional inspection
9. Surface inspection
10. NDT when specified
11. Marking
12. Final inspection and packaging

ASTM B366 permits forming operations including hammering, pressing, piercing, extruding, upsetting, rolling, bending and other applicable manufacturing processes.

Applications

ASTM B366 N08810 Incoloy 800H equal tees can be specified for piping systems used in:

Petrochemical Processing

• Hydrocarbon processing
• High-temperature process piping
• Refinery systems
• Furnace-associated piping

Chemical Processing

• High-temperature chemical process lines
• Corrosive process environments
• Process gas systems

Heat Treatment and Industrial Furnaces

• High-temperature furnace piping
• Heat-treatment equipment
• Furnace process systems

Energy and Process Equipment

• High-temperature piping
• Steam-related systems
• Heat exchanger-associated piping
• Industrial thermal processing equipment

The 800H/800HT family is specifically used where elevated-temperature mechanical performance and resistance to oxidation or carburization are relevant design considerations.