Incoloy Blind Flanges

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
• Download the Incoloy 800 datasheet and 825 datasheet

Not to be confused with Inconel, Incoloy blind 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:

• Incoloy 800, 800H, 800HT
• Incoloy 825
• Incoloy 925

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: Lap Joint Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges

Common Incoloy Chemistry, Grades & Specifications

Incoloy 800, 800H, H800HT

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 800 Bolts

A Ni-Cr alloy with very good high temperature stability

Incoloy 800 bolts are best utilized for applications that require stable structure and good strength during prolonged exposure to high temperatures. These bolts are utilized in a diversity of industries involving corrosive environments and high temperatures. Incoloy 800 series nickel alloys include Incoloy 800, 800H, and 800HT. All are identical except for the higher level of carbon in alloy 800H and the addition of approximately 1.20 percent aluminum and titanium in 800HT. Incoloy 800H offers improved stress rupture properties over 800. Incoloy 800HT further improves on this to ensure optimum high temperature properties.  Learn more by downloading our Incoloy datasheet.

Corrosion Resistance

• Good strength and excellent resistance to oxidation and carburization in high-temperature exposure
• Good high temperature strength
• High creep rupture strength
• Good corrosion resistance in many acidic environments
• Good resistance to many sulfur-containing atmospheres

Temperature Guidelines

Incoloy 800 is primarily used in applications with temperatures up to 1100° F, where alloys 800H and 800HT are normally used in temperatures above 1500°F where creep and stress rupture protection are a critical concern.  Incoloy 800HT will not become embrittled even after long periods of usage in the 1200-1600° F. When exposing Incoloy 800 to aggressive media in the temperature range of 1000 to 1400°F, it can be sensitized and made susceptible to intergranular attack.

Applications

• Industrial and chemical processing industries look to Incoloy 800 series bolts for the construction of heat exchangers and process piping, as well as carbonizing equipment and heating element sheathing.
• Nuclear power plants require Incoloy 800 for steam generators, while the pulp and paper industry needs these bolts digestor-liquor heaters.
• Chemical and petroleum processing employ Incoloy 800 bolts for heat exchangers and other environments containing nitric acid media, as well as for applications where resistance to chloride stress-corrosion cracking is required.

Incoloy 800 Physical Properties

• Density: 0.27 lbs/in³, 7.94.g/cm³
• Specific Heat, Btu/lb•°F, J/kg•°C:
• 32-212°F (0-100°C): 0.11 (460)
• Mean Coefficient of Thermal Expansion: in/in/°F (mm/m/°C) 70- 212°F (20- 100°C)– 7.9 x 10-6 (14.2)
• Thermal Conductivity: BTU/h-ft-°F (W/m-°K): 70°F (21°C): 6.7 (11.6)
• Modulus of Elasticity: ksi (MPa) 28.5 x 10³ (196.5 x 10³) in tension
• Permeability at 70°F (21°C) H= 200 Oersted : Annealed : 1.014
• Melting Point: 2525°F (1385°C)

Incoloy 800 Strength Properties

• Ultimate Tensile Strength: 75 KSI min (420 MPa min)
• Yield Strength (0.2% offset): 30 KSI (gauges ≥ 0.020 inches)
• Elongation: 30% min
• Hardness: Rb 84 nom

*Annealed Typical at room temperature

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, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges 

Incoloy 800, 800H & 800HT Chemistry and Specifications

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 800 Mechanical Properties

Incoloy 800 Flanges

A Ni-Cr alloy with very good high temperature stability

Incoloy 800 flanges are best utilized for applications that require stable structure and good strength during prolonged exposure to high temperatures. These flanges are utilized in a diversity of industries involving corrosive environments and high temperatures. Incoloy 800 series nickel alloys include Incoloy 800, 800H, and 800HT. All are identical except for the higher level of carbon in alloy 800H and the addition of approximately 1.20 percent aluminum and titanium in 800HT. Incoloy 800H offers improved stress rupture properties over 800. Incoloy 800HT further improves on this to ensure optimum high temperature properties.  Learn more by downloading our Incoloy datasheet.

Corrosion Resistance

• Good strength and excellent resistance to oxidation and carburization in high-temperature exposure
• Good high temperature strength
• High creep rupture strength
• Good corrosion resistance in many acidic environments
• Good resistance to many sulfur-containing atmospheres

Temperature Guidelines

Incoloy 800 is primarily used in applications with temperatures up to 1100° F, where alloys 800H and 800HT are normally used in temperatures above 1500°F where creep and stress rupture protection are a critical concern.  Incoloy 800HT will not become embrittled even after long periods of usage in the 1200-1600° F. When exposing Incoloy 800 to aggressive media in the temperature range of 1000 to 1400°F, it can be sensitized and made susceptible to intergranular attack.

Applications

• Industrial and chemical processing industries look to Incoloy 800 series flanges for the construction of heat exchangers and process piping, as well as carbonizing equipment and heating element sheathing.
• Nuclear power plants require Incoloy 800 for steam generators, while the pulp and paper industry needs these flanges digestor-liquor heaters.
• Chemical and petroleum processing employ Incoloy 800 flanges for heat exchangers and other environments containing nitric acid media, as well as for applications where resistance to chloride stress-corrosion cracking is required.

Incoloy 800 Physical Properties

• Density: 0.27 lbs/in³, 7.94.g/cm³
• Specific Heat, Btu/lb•°F, J/kg•°C:
• 32-212°F (0-100°C): 0.11 (460)
• Mean Coefficient of Thermal Expansion: in/in/°F (mm/m/°C) 70- 212°F (20- 100°C)– 7.9 x 10-6 (14.2)
• Thermal Conductivity: BTU/h-ft-°F (W/m-°K): 70°F (21°C): 6.7 (11.6)
• Modulus of Elasticity: ksi (MPa) 28.5 x 10³ (196.5 x 10³) in tension
• Permeability at 70°F (21°C) H= 200 Oersted : Annealed : 1.014
• Melting Point: 2525°F (1385°C)

Incoloy 800 Strength Properties

• Ultimate Tensile Strength: 75 KSI min (420 MPa min)
• Yield Strength (0.2% offset): 30 KSI (gauges ≥ 0.020 inches)
• Elongation: 30% min
• Hardness: Rb 84 nom

*Annealed Typical at room temperature

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, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges 

Incoloy 800, 800H & 800HT Chemistry and Specifications

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 800 Mechanical Properties

Incoloy 825 Screws

Improved corrosion resistance to Incoloy 800, same high temp stability

Related to the Incoloy 800 series alloys, this specialty nickel alloy differentiates itself with the additional elements of molybdenum and copper, which provides it improved corrosion resistance – specifically pitting and crevice corrosion, as well as reducing environments. In addition to its strength and corrosive properties, it also offers good weldability by all conventional processes. Learn more by downloading our Incoloy datasheet.

Corrosion Resistance

Primary corrosive environments where Incoloy screws are most useful are sulfuric acid, phosphoric acid, sulfur-containing flue gases, sour gas and oil wells, and sea water.

• Improved resistance to aqueous corrosion compared to Incoloy 800
• Excellent resistance to both reducing and oxidizing acids
• Especially resistant to sulfuric and phosphoric acids
• Good resistance to chloride stress-corrosion cracking, as well as pitting and crevice corrosion
• Good resistance to a variety of oxidizing substances such as nitric acid, nitrates and oxidizing salt
• Good resistance to stress-corrosion cracking in neutral chloride media.

Gain a better understanding of Incoloy 825's corrosion performance in:

• Sulfuric Acid
• Hydrochloric Acid

Temperature Guidelines

Alloy 825 screws have good mechanical properties from cryogenic temperatures to moderately high temperatures up to approximately 1000° F. When used at temperatures above 1000° F microstructural changes will occur that significantly lower ductility and impact strength.

Applications

• Chemical processing utilizes Incoloy 825 screws for their resistance to sulfuric and phosphoric acid which makes it useful in acid production and pickling.
• Nuclear relies on these screws for fuel reprocessing, fuel element recovery and radioactive waste handling.
• Resistant to both localized and general corrosion, Incoloy also plays a role in a broad range of additional industries including pollution control and oil & gas. 

Incoloy 825 Physical Properties

• Density: 0.294 lbs/in³, 8.14 g/cm³
• Specific Heat, (32-212°F),Btu/lb•°F, (0-100°C), J/kg•°C: 0.105 (440)
• Mean Coefficient of Thermal Expansion: in/in/°F (mm/m/°C): 70- 212°F (20- 100°C): 7.7 x 10-6 (13.9)
• Thermal Conductivity BTU/h-ft-°F (W/m-°K):  70°F (21°C): 6.4 (11.1)
• Modulus of Elasticity, ksi (MPa): 28.4 x 10³ (196 x 10³) in tension
• Melting Range: 2500-2550°F (1370-1400°C)

Incoloy 825 Strength Properties

• Ultimate Tensile Strength: 100 KSI min (690MPa min)*
• Yield Strength: (0.2% offset) 47KSI min (324MPa min)*
• Elongation: 45%*

*Annealed, Typical at room temperature

 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, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges

Incoloy 825 Chemistry and Specifications

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 825 Mechanical Properties

Incoloy 825 Sulfuric Acid Iso-Corrosion Curve

Incoloy 825 Hydrochloric Acid Iso-Corrosion Curve