ASTM ASME SB 408 Alloy 800 Incoloy 800 UNS N08800 Bar

ASTM/ASME SB 408 is the specification for Incoloy 800 (UNS N08800) bars. Incoloy 800 is a nickel-iron-chromium alloy known for its excellent strength and oxidation resistance at high temperatures. Here's a detailed overview:

 

Common Types:

 

Round Bars: Most common type, available in various diameters.

Square Bars: Offered in square cross-sections, suitable for different applications.

Hexagonal Bars: Have six sides and are often used for fasteners and fittings.

Flat Bars: Have a rectangular cross-section, used for structural applications.

Forged Bars: Produced by forging process, providing better mechanical properties.

 

Common Sizes:

 

Diameter: 5 mm - 500 mm

Length: Up to 12 meters

 

Chemical Composition (Typical):

 

Nickel (Ni): 30.0 - 35.0%

Iron (Fe): 39.5% min

Chromium (Cr): 19.0 - 23.0%

Carbon (C): 0.10% max

Manganese (Mn): 1.50% max

Silicon (Si): 1.0% max

Sulfur (S): 0.015% max

 

Mechanical Requirements:

 

Tensile Strength: 75 ksi (520 MPa) min

Yield Strength (0.2% offset): 30 ksi (205 MPa) min

Elongation: 30% min

Hardness: HRB 75-90

 

Applications:

 

Incoloy 800 bars find extensive use in heat-treating equipment, furnace components, chemical processing, and power generation industries.

Common applications include furnace muffles, radiant tubes, heat exchangers, steam superheater tubes, and other components exposed to high-temperature and corrosive environments.

Incoloy 800 offers excellent resistance to oxidation, carburization, and sulfidation at elevated temperatures.

 

Q&A:

 

Q: What makes Incoloy 800 bars suitable for high-temperature applications?

A: Incoloy 800 offers excellent creep and rupture strength at high temperatures, making it suitable for applications where resistance to thermal degradation is critical.

 

Q: Can Incoloy 800 bars be welded?

A: Yes, Incoloy 800 is readily weldable using common welding techniques. However, appropriate welding procedures and post-weld heat treatment may be necessary to maintain mechanical properties and corrosion resistance.

 

Q: What are the limitations of Incoloy 800?

A: While Incoloy 800 offers excellent high-temperature strength and oxidation resistance, it may not be suitable for applications involving severe carburization or sulfur-containing environments.

 

Q: How does Incoloy 800 compare to other nickel alloys?

A: Incoloy 800 offers a balanced combination of strength, oxidation resistance, and fabricability, making it suitable for various high-temperature applications. It is often preferred for its reliability and performance in harsh environments.

 

Q: Can Incoloy 800 bars be used in chemical processing?

 

A: Yes, Incoloy 800 is widely used in chemical processing industries for components exposed to corrosive environments and elevated temperatures. Its resistance to oxidation and carburization makes it suitable for such applications.

 

 

Difference Alloy 800HT/Incoloy 800HT/UNS N08811, Alloy 800/Incoloy 800/UNS N08800, Alloy 800H/Incoloy 800H/UNS N08810

 

 

Alloy 800, Incoloy 800, and UNS N08800 all refer to the same nickel-iron-chromium alloy, which is designated by ASTM as Alloy 800. Similarly, Alloy 800H, Incoloy 800H, and UNS N08810 refer to a variation of the same alloy with higher carbon content for improved high-temperature strength. Finally, Alloy 800HT, Incoloy 800HT, and UNS N08811 represent another variation with even higher carbon content and additional elements for enhanced high-temperature properties.

Here's a breakdown of the differences:

 

Alloy 800/Incoloy 800/UNS N08800:

 

This is the standard composition of the alloy with moderate carbon content.

It offers good strength and excellent resistance to oxidation and carburization at high temperatures.

Typically used in applications where high-temperature strength and corrosion resistance are required, such as heat exchangers, furnace components, and petrochemical processing.

 

Alloy 800H/Incoloy 800H/UNS N08810:

 

Alloy 800H has higher carbon content compared to Alloy 800.

The increased carbon content provides enhanced creep and rupture properties at high temperatures.

It is commonly used in applications requiring higher strength and stability at elevated temperatures, such as industrial heating equipment and steam generators.

 

Alloy 800HT/Incoloy 800HT/UNS N08811:

 

Alloy 800HT has even higher carbon content and additional elements such as aluminum and titanium compared to Alloy 800H.

The higher carbon content and alloying elements further improve high-temperature properties, including creep resistance and thermal stability.

 

It is suitable for applications where extremely high-temperature strength and resistance to oxidation and carburization are necessary, such as in power generation, chemical processing, and furnace components for petrochemical applications.

 

In summary, the main differences between Alloy 800, Alloy 800H, and Alloy 800HT lie in their carbon content and additional alloying elements, which affect their high-temperature properties and suitability for specific applications.

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