A Ni-Cr alloy with very good high temperature stability

 

Not to be confused with Inconel, Incoloy 12 point 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 screws are Incoloy 800, 800H, 800HTIncoloy 825; and Incoloy 925. For more indepth information on these specific grades, visit our specific web pages or contact one of our engineering experts:

ResourcesIncoloy Torque SpecsFlange DimensionsFlange Bolting Chart

Incoloy Fastener Types: BoltsNutsScrewsThreaded RodsWashers

Screw Types Available:  12 Point ScrewsButton Head Cap ScrewsFlat Head ScrewsHex Head Cap ScrewsPan Head ScrewsSet ScrewsSocket Head Cap ScrewsTorx ScrewsVented Screws


 Incoloy 12-Point Screw Features & Benefits

The driver of a Incoloy 12-point screw uses two overlapped hexagon shapes, creating 12-points and a flanged underside. These are also referred to as ferry cap screws or 12 point flange screws. The advantages of this head style include:

  • Higher torque capability compared to a socket head cap screw
  • Lack of recess to trap fluid or debris.
  • As the heads are generally smaller than a hex, Incoloy 12-point screws are often used situations where installation space is tight and saving weight is critical.

The overall disadvantage is the extra cost involved in forming the heads.

The Controversy of 6 vs. 12 point Bolts

There is much debate over which bolt is better. Some say that the more points a nut or bolt has – such as a 12-point bolt - the less chance you have to round it off. And that the additional contact points of a 12 point screw give you more surface to apply load. While the jury is out as to the accuracy of this, it’s the application that should dictate whether the benefits of a 12 point screw out weight the additional costs of making them. 


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

 Incoloy 800 Chemistry

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 825 Chemistry

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 Incoloy 925 Chemistry


Mechanical Properties of Incoloy

Incoloy 800 Tensile Curve

Incoloy 825 Tensile Curve

  

Incoloy 925 Tensile Curve Aged

 

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