Inconel 800 Flanges are metallic alloy flanges composed of nickel-chromium alloys with high strength and great resistance to oxidation, carburization, and sulfidation. Originally developed in the early 1930s by Wiggin Alloys, it has since been used for parts requiring good corrosion resistance and mechanical strength at temperatures ranging from cryogenic up to 1200°F (650°C). Its unique properties have made it popular in applications such as nuclear reactors, industrial furnaces, aerospace jet engines, petrochemical plants, pipes, and valves used in oil & gas production.

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Corrosion Resistance of Inconel 800 Flanges

800 Alloy flanges offer exceptional corrosion resistance, particularly against pitting and crevice corrosion. A weld neck flange is commonly used for pipes in chemical and petrochemical plants due to its resistance to harsh environments. Specifically, the corrosion resistance of Inconel 800 weld neck flanges ranges from 40-50 words in length on the Rockwell scale.

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Alloy 800 flanges Machining

UNS N08811 Flanges machining involves careful cutting and forming to generate the desired shape. High-speed machining is often utilized with specialized cutting tools. Additionally, care is taken to ensure the flange’s precision, strength, and durability by utilizing advanced grinding processes. In some cases, a heat treatment may also be necessary to harden the metal after machining for further protection against cracking or erosion due to high temperatures.

Incoloy 800/800H/800HT Flanges

Incoloy 800/800H/800HT Flanges

800 inconel flanges chemical composition

Alloy 800 flanges are especially well-suited for high-temperature applications due to their excellent heat and corrosion resistance. The main chemical features of this material include 18% chromium, 14% nickel, 3-4% iron and a small amount of other elements such as manganese, silicon, carbon, sulfur and phosphorus. Additionally, these flanges have high strength even when exposed to temperatures up to 1000°F (538°C), making them the ideal choice for weld neck flange applications in harsh environments.

Alloy 800HT Weld Neck Flange, Alloy 800HT Socket Weld Flange, Alloy 800H Blind Flange, Alloy 800H Slip On Flanges, Incoloy 800 Flanges , Incoloy 800H Flanges , Incoloy 800HT Flanges , Incoloy Alloy 800 Flanges, Inconel 800h Sorf flanges

Uses of Inconel 800 Flanges

Nickel alloy 800 are commonly used in a variety of industries. Their primary use is in the fabrication and installation of piping systems, including weld neck flanges. Weldneck flanges are known for their strength and durability when exposed to extremely high temperatures, making them ideal for applications such as chemical plants or oil refineries. They are also corrosion-resistant, which can be used in plants with acids or other corrosive elements. In some cases UNS N08811 weld flanges may be preferable over steel alternatives due to their superior heat resistance properties.

What is the difference between INCOLOY 800 and 800H Flanges?

The main difference between Incoloy 800 and 800H flanges is their carbon content. Incoloy 800H has a higher carbon content than Incoloy 800, which makes it more suitable for high-temperature applications. Incoloy 800H is designed to be used in applications where temperatures can reach up to 1000°F (538°C), while Incoloy 800 is intended for use in applications where temperatures can reach up to 870°F (466°C). Due to its higher carbon content, Incoloy 800H has improved strength & hardness at high temperatures, making it more suitable for applications such as petrochemical processing and power generation.

What is the difference between 800H and 800HT Flanges?

The main difference between Incoloy 800H and 800HT flanges is their maximum operating temperature. Incoloy 800H is designed for use in applications where temperatures can reach up to 1000°F (538°C), while Incoloy 800HT is intended for use in applications where temperatures can reach up to 1200°F (649°C). With this higher temperature rating, Incoloy 800HT has a higher carbon, aluminum & titanium level than Incoloy 800H. This composition gives Incoloy 800HT greater strength & resistance to high-temperature oxidation, making it more suitable for applications such as steam methane reformers & furnace components.

What are the benefits of 800H Flanges?

Incoloy 800H flanges offer several benefits, including excellent corrosion resistance & high-temperature strength. These flanges are highly resistant to oxidation and carburization at high temperatures, making them suitable for harsh environments such as chemical and petrochemical processing plants. Incoloy 800H flanges have good resistance to sulfur-containing atmospheres, which makes them ideal for use in flue gas desulfurization systems. Another benefit of Incoloy 800H flanges is their high-temperature strength, which makes them suitable for applications where temperatures can reach up to 1000°F (538°C).

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Incoloy® Alloy 800/800H/800HT Socket Weld Flanges Specification

Specifications ASTM B564 / ASME SB564

Dimensions ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.

Standard ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.

Size 1/2″NB TO 60″NB

Class / Pressure 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.

Flange Face Type Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Grade 800 / 800H / 800HT UNS (N08800, N08810, N08811), DIN (1.4876, 1.4958, 1.4959)

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Incoloy 800/800H/800HT Flanges Equivalent Indian Standard

Incoloy 800 N08800 1.4876 Z8NC32-21 X10NiCrAlTi32-20 NCF 800 NA 15 ЭИ670 XH32T
Incoloy 800H N08810 1.4958 Z8NC32-21 X10NiCrAlTi32-20 NCF 800H NA 15(H) ЭИ670 XH32T
Incoloy 800HT N08811 1.4959 - X8NiCrAlTi32-21 NCF 800HT NA 15(HT) ЭИ670 XH32T

ASTM B564 Incoloy® Alloy 800/800H/800HT Forged Flanges Chemical Composition

Grade Ni Fe Cr Cu Ti Al C Mn S Si
Incoloy 800 30.0-35.0 39.5 min 19.0-23.0 .75 max .15-.60 .15-.60 .1 max 1.5 max .015 max 1.0 max
Incoloy 800H 30.0-35.0 39.5 min 19.0-23.0 .75 max .15-.60 .15-.60 .05-.10 max 1.5 max .015 max 1.0 max
Incoloy 800HT 30.0-35.0 39.5 min 19.0-23.0 .75 max .25-.60 .85-1.20 .06-.10 max 1.5 max .015 max 1.0 max

800/800H/800HT Incoloy ASME SB564 Threaded / Screwed Flanges Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
7.94 g/cm3 1350-1400 ℃ Psi - 75,000 , MPa -520 Psi - 30,000 , MPa - 205 30 - 35 %

Other Types of 800/800H/800HT Incoloy Industrial Flanges

  • Incoloy 800 Slip On Flanges
  • 800H Incoloy® Pipe Flanges
  • Nickel Alloy 800HT Blind Flanges
  • Incoloy® Alloy 800 Orifice Flange
  • Incoloy Alloy 800H Long Weld Neck Flanges

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