Incoloy 800 Screws

A Ni-Cr alloy with very good high temperature stability (1.4958, 1.4876 and 1.4959)

Incoloy 800 screws are best utilized for applications that require stable structure and good strength during prolonged exposure to high temperatures. These screws 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.  You can also download our Incoloy 800 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 screws 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 screws digestor-liquor heaters.
• Chemical and petroleum processing employ Incoloy 800 screws 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 Lap Joint 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
• Lap joint flange features and benefits
• Download the Incoloy 800 datasheet and 825 datasheet

Not to be confused with Inconel, Incoloy 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: Blind Flanges, Slip On 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 Lap Joint Flange Features & Benefits

Lap joint flanges are unique in that they are made of two pieces, the flange itself and the stub end.

Flange

• The backside, has a slight shoulder that is square cut at the center or pipe hole
• The front side has a flat face with a filleted (rounded) center hole to match the filleted back face of the stub end. Here the stub end will wrap tightly around the center hole of the flange.

Stub End

• Shaped like a short piece of pipe with a weld bevel on one. This portion of the stub end is also called the sleeve.
• Narrow shoulder on the flange facing end called is the hub. The back face of the hub has a rounded transition (or inside fillet) that joins the hub to the sleeve

Benefits

• Economy 
  Because a lap joint flange has a two piece configuration, it offers a way to cut cost when piping systems requires 
• For high cost alloys the only "wetted" part is the stub end. In this situation, it is only required for the stub-end to be made of the higher cost corrosion-resistant material, where the flange itself can be the produced from lower cost steel.
• Ease of Work
  By using lap joint flanges, work can be simplified in situations that require frequent and rapid disassemble and assembly during the operation of a plant. The ability to spin that backing flange compensates for misalignment of the bolt holes during assembly.

Incoloy Slip On 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
• 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:

• 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: 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.

Incoloy Socket Weld 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
• Socket weld flange features and benefits
• Download the Incoloy 800 datasheet and 825 datasheet

Not to be confused with Inconel, Incoloy socket weld 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: Blind Flanges, Lap Joint Flanges, Slip On 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

Socket Weld Flange Features & Benefits

Similar to a slip on flange, an Incoloy socket weld flange has an added shoulder inside the bore hole. The socket weld flange is designed so that a pipe can be inserted into the socket of the flange until it hits the shoulder of the socket. The pipe is then backed away from the shoulder approximately 1/16 inches before being welded to the flange hub. This internal weld provides this type of flange added strength. In addition, by grinding the internal weld smooth, turbulence and flow restriction are minimized. Incoloy socket weld flanges are most commonly used on small diameter applications (1/2" through 4") and high pressure piping systems.

Socket Weld Flange Benefits

• Best for small size, high pressure applications
• Static strength equal to a slip on flange yet boasts a fatigue strength 1.5 times that of the slip on design
• Employs both a backside hub weld and an internal shoulder weld for increased strength
• Socket weld flanges delivers a lower risk of leakage than threaded flanges
• Socket weld pipes do not have to be beveled for weld preparation
• Butt-welded joints are easily fitted and no special machining

Socket Weld Flange Disadvantages

• The expansion gap and internal crevices left in socket welded systems can promote crevice corrosion.
• Socket weld flanges have two welds which makes them stronger yet more labor intensive to install. Due to the increased welding, it has become the practice to weld only at the hub of the flange, which is not recommended.

Installation Tips
The socket weld pipe fittings should allow for expansion gap of 1/16 inch (1.6 mm) between pipe and the shoulder of the socket.