A Ni-Cr alloy with very good high temperature stability
Good high temperature strength- Oxidization and carburization resistant at high temperatures
- Good corrosion resistance, which increases with the various grades
- Slip on flange features and benefits
- For technical information, download an Incoloy datasheet
Not to be confused with Inconel, Incoloy lap joint flanges are made of a nickel alloy which contains iron and a lower content of nickel. Incoloy is essentially a more economical option to Inconel, yet with more restricted corrosion resistance and temperature limits. Typically, Incoloy is an ideal material for long-term exposure in high temperature environments due to its oxidation, carburization and creep resistance. Incoloy is widely used for its resistance to seawater, brine, sour gas and high chloride environments at elevated temperatures, which make it a popular choice in the oil and gas and power industries.
The most commonly used grades of Incoloy flanges are Incoloy 800, 800H, 800HT;Incoloy 825; and Incoloy 925. For more indepth information on these specific grades, visit our specific web pages or contact one of our engineering experts:
Datasheets: Incoloy 800, 800H 800HT; Incoloy 825; and Incoloy 925
Resources: Incoloy Torque Specs, Flange Dimensions, Flange Bolting Chart
Incoloy Fastener Types: Bolts, Nuts, Screws, Threaded Rods, Washers
Flange Types Available: Blind Flanges, Lap Joint Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges
Common Incoloy Chemistry, Grades & Specifications
Incoloy 800, 800H, H00HT
Incoloy 800 series flanges are best utilized for applications that require stable structure and good strength during prolonged exposure to high temperatures.
Incoloy 800, 800H & 800HT Specifications: UNS N08800/ N08810 / N08811 (800, 800H, 800HT), ASTM B408, ASME SB408, ASTM B564/ASME SB564, EN 10204-3.1, Werkstoff 1.4876 (800), Werkstoff 1.4876 H and 1.4958 (800H), Werkstoff 1.4876 HT and 1.4959 (800HT)
Incoloy 825
Related to the Incoloy 800 series alloys, Incoloy 825 differentiates itself with the additional elements of molybdenum and copper, which provides it improved corrosion resistance.
Incoloy 825 Specifications: UNS N08825, , BS 3076NA16, ASTM B 425, ASTM B 564, ASME SB 425, ASME SB 564, ASME Code Case N-572, DIN 17752, DIN 17753, DIN 17754, VdTÜV 432, ISO 9723, ISO 9724, ISO 9725, Werkstoff Nr 2.4858
Incoloy 925
Incoloy 925 is a precipitation hardened alloy. It offers comparable corrosion resistance to it’s sister alloy Incoloy 825, but with the increased strength resulting from the age hardening process.
Incoloy 925 Specifications: UNS N09925, ASTM B637, NACE MR0175 
Mechanical Properties of Incoloy
Incoloy Slip on Flange Features & Benefits
Incoloy Alloy 20 slip on flanges are similar to the socket weld flange but without the socket shoulder. When using a socket weld flange, the pipe rests against this internal shoulder. Since a slip on flange does not have shoulder, the pipe can slide completely through the flange hub and is free to spin.
Advantages
- Typically lower in price than weld-neck flange, yet welding costs can be more.
- There is a reduced need to cut the pipe length accurately, making it easier to install.
- The slip on flange is free to spin on the pipe for easy bolt alignment.
Disadvantages
- They require two fillet welds: one fillet weld at the hub of the flange and a second weld at the inside diameter of the flange near the flange face.
- Though they can be used for high temperature and pressure applications, they typically are not as other flange types give a more secure joint.