Incoloy 925 Flanges

An age hardened version of Incoloy 825 with improved strength.

Incoloy 925 flanges are made of a precipitation hardened nickel alloy. It offers comparable corrosion resistance to it’s sister alloy Incoloy 825, but with the increased strength resulting from the age hardening process. In addition, Incoloy 925 also contains additional levels of titanium and aluminum compared to 825. Incoloy 925 flanges are ideal for use in applications that require a combination of high strength and corrosion resistance. Learn more by downloading our Incoloy datasheet.

Corrosion Resistance

Incoloy 925 flanges are known to have outstanding resistance to general corrosion, pitting, crevice corrosion, and stress-corrosion cracking in many aqueous environments including those containing sulfides and chlorides. In addition, the higher nickel content than Incoloy 800, gives it improved protection against chloride-ion stress corrosion cracking. The added molybdenum and copper provides resistance to reducing chemicals.

• Good protection in oxidizing and reducing atmosphere
• Good resistance to chloride ion stress-corrosion cracking
• Excellent resistance to pitting and crevice corrosion

Temperature Guidelines

Incoloy 925 flanges remain strong at temperatures up to 1200°F (650°C).

Applications

• Often used for down-hole and surface gas-well because of their excellent resistance to sulfide stress cracking and stress-corrosion cracking in “sour” (H2S containing) crude oil and natural gas.

• Marine and pump shafts or high-strength piping systems.

 Incoloy 925 Physical Properties

• Density (lb / cu. in.): 0.292
• Specific Gravity: 8.14
• Specific Heat (Btu/lb/Deg F - [32-212 Deg F]): 0.109
• Electrical Resistivity (microhm-cm (at 68 Deg F)): 701
• Melting Range (Deg F): 2392-2490
• Poissons Ratio: 0.281
• Mean Coefficient of Thermal Expansion: 7.32
• Magnetic Permeability: 1.01
• Modulus of Elasticity Tension: 28.7

Incoloy 925 Strength Properties

For common comparison, Incoloy 925 (167.3 ksi tensile, solution treated & aged) offers a level of strength that is greater than Inconel 625 (144 ksi tensile) but less than that of age-hardened Inconel 718 (210 ksi tensile, annealed & aged).

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 925 Chemistry and Specifications

Incoloy 925 Specifications: UNS N09925, ASTM B637, NACE MR0175

 Incoloy 925 Mechanical Properties

Incoloy Vented Screws

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
• Incoloy vented screw features & benefits
• Download the Incoloy 800 datasheet and 825 datasheet

Not to be confused with Inconel, Incoloy vented screws 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 nickel alloy screws 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

Screw Types Available:  12 Point Screws, Button Head Cap Screws, Flat Head Screws, Hex Head Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Tamper Resistant Security Screws, Torx Screws, Vented Screws

Incoloy Vented Screw Features & Benefits

Incoloy vented screws are ideal for use in high vacuum (UV) and ultra high vacuum (UHV) equipment, as well as other high pressure environments and applications where gas pockets can form. Center vented screws have a center bore drilled through their axis from the head through the threaded shank of the screw. This feature provides an outlet for the complete evacuation of trapped air and gas contaminants to be pumped away from blind-tapped screw holes, bottoms, sides and shoulders. In addition to vented screws, washers with vent grooves can be made to ensure the venting of the cavity found under the screw head.

Incoloy Vented Screws Benefits
•  Enables faster, more efficient pump-down of HV & UHV systems
•  Eliminates virtual leaks
•  Relieves pressure from blocked gases
•  Provides means to vent contaminants found in screw voids
•  Promotes higher system throughput and improved yield
•  Allows for constant pressure and temperature equalization

Incoloy Vented Screws Are Available In:
Grades:  Incoloy 800HT, Incoloy 825, and Incoloy 925
Styles:  Socket Head Cap Screw and Hex Head Cap Screw

What is a vented washer?
When a screw is tightened over a flat washer, or directly an application without a washer, volumes of gas can be trapped in the space and beneath the fastener head along the screw shaft. Vented washers feature two bored canals on opposite sides of the flat face which provide an escape route for trapped gases.  

What is a virtual leak?
A virtual leak is comprised of gases that are trapped physically within a pocket with only a miniscule escape path from the trapped pocket of gas into the chamber proper. 

Common Incoloy Chemistry, Grades & Specifications

Incoloy 800, 800H, H00HT

Incoloy 800 series screws 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 Weld Studs

A Ni-Cr alloy with very good high temperature stability

• Good high temperature strength
• Oxidization and carburization resistant at high temperatures
• Good corrosion resistance
• Weld studs available in Incoloy 800 & 825
• Features & benefits of Incoloy weld studs
• Download the Incoloy 800 datasheet and 825 datasheet

Incoloy weld studs are available in a variety of fastener styles for manual (MIG, TIG) arc and capacitor discharge welding methods. Oxidation, carburization and creep resistant, Incoloy weld studs provide a secure, cross-sectional weld in single-sided access situations, making them ideal for long-term exposure in high temperature environments.

Not to be confused with Inconel, Incoloy weld studs 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. 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. 

Datasheets: Incoloy 800, 800H 800HT; Incoloy 825; and Incoloy 925

Resources: Incoloy Torque Specs, Flange Dimensions, Flange Bolting Chart, 

Incoloy Fastener Types: Bolts, Nuts, Threaded Rods, Washers

Screw Types Available:  12 Point Screws, Button Head Cap Screws, Flat Head Screws, Hex Head Cap Screws, Pan Head Screws, Set Screws, Socket Head Cap Screws, Torx Screws, Vented Screws

Incoloy Weld Stud Features & Benefits

Available in alloy 800 and 825, Incoloy weld studs are an ideal way to securely attached fasteners in extreme applications where reaching both sides of a structure is impossible or undesired. These weld studs can be attached by a variety of welding techniques, such as MIG or TIG welding or they can be attached by automated welding guns using Arc or Capacitor Discharge (CD) technologies.

Arc and Capacitive Discharge (CD) Weld Stud Benefits

• Security: Unlike the peripheral weld used on a common bolt, the weld used to secure a weld stud fastener is a full cross sectional weld, so the full face of the fastener is welded in place for a strong, secure hold. And since there are no drilled holes – which weakens the structural integrity of the application – the attachment is even stronger.
• Speed: Installing an Incoloy weld stud is a fast and simple process with a most fasteners taking less than 1 second to weld in place. Plus there is no secondary work such as drilling, polishing or grinding.
• Simplicity: Weld studs require almost no special skills and minimal training and equipment is needed for installation. In addition, the equipment is also portable.
• Variety: Incoloy weld studs are available in a wide variety of fastener styles including (but not limited to) fully threaded, partially threaded, full base, reduced base, long, tapped base, and shoulder thread to name a few.

Chemistry & Specifications of Incoloy 800 & 825 Weld Studs

Incoloy 800, 800H, H00HT

Incoloy 800 screws 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

Mechanical Properties of Incoloy