INCOLOY® alloy 925 is a nickel-iron-chromium alloy that features the additives of titanium, copper, aluminum, and molybdenum, and is famed for offering an excellent combination of excellent corrosion resistance and superior strength.  The good nickel content of this alloy provides it with adequate protection against chloride-ion stress-corrosion cracking, while the molybdenum and copper additives in it offer it with good resistance to reducing chemicals. The molybdenum content in this nickel alloy additionally provides it with resistance to pitting and crevice corrosion.  The excellent combination of chromium and nickel found in INCOLOY® 925 renders protecting in both reducing and oxidizing atmospheres. These features of the Alloy 925 make it ideal for applications in sour gas environments. hangers and valves. It also is commonly used for fasters, as well as pump shafts in marine environments.

Machinability

INCOLOY® 925 is a nickel alloy that can be machined with the usage of conventional processes that are used for typical iron-based alloys. Heavy-duty machining equipment and tooling are used to reduce the work hardening of Alloy 925. Various types of machining operations can be performed on it by using certain commercial coolants. Water-based coolants are generally used when working on high-speed operations like milling, grinding and turning.

Corrosion Resistance

The corrosion resistance capacity of INCOLOY® 925 is extremely high. This alloy is able to resist stress-corrosion cracking, intergranular corrosion, crevice corrosion, general corrosion and pitting in both oxidizing and reducing environments. The environments where this alloy is widely used due to its incredible corrosion resistance include crude oil and natural gas containing H2S, seawater, phosphoric acid, and sulfuric acid.

Hot and cold forming

870 to 1175°C/ 1600 to 2150° F is broadly the hot working range for the INCOLOY® 925. The hot working characteristics of this nickel alloy tend to be similar to that of INCOLOY alloy 825 at temperatures up to 1095°C/2000°F. For the highest strength and optimal corrosion resistance after direct aging, final hot working must be done at a range of 870 to 980°C (1600 to 1800°F).

The cold working temperament of the INCOLOY alloy 925 is similar to Alloy 825 as well, apart from the fact that Alloy 925 has a superior work-hardening rate.

Welding

For welding products made of INCOLOY alloy 925, designated INCOWELD® filler metal 725NDUR is typically recommended. The INCO-WELD filler metal725NDUR would be able to provide superior corrosion resistance and better strength in comparison to the alloy 925 composition welding wire. Gas-metal-arc welding (GMAW) and gas-tungsten-arc welding (GTAW) are two of the most preferable welding methods when it comes to Alloy 925. However, when the GMAW process is being used, it is important to note that the current levels do not exceed 180 amps for standard GMAW power sources in the “spray arc” metal transfer mode.

Forging and annealing

The forging of INCOLOY® alloy 925 is typically done at 1700 to 2150°F/927 to 1177°C. This nickel alloy is additionally annealed at 1010°C (1850°F) for approximately two hours, followed by air cooling.

Incoloy 925 Composition

The following table shows the chemical composition of Incoloy(r) alloy 925™.

ElementsContent (%)
Nickel, Ni44
Iron, Fe28
Chromium, Cr21
Molybdenum, Mo3
Titanium, Ti2.1
Copper, Cu1.8
Aluminum, Al0.3
Carbon, C0.01

Incoloy 925 Melting Point

PropertiesMetricImperial
Density8.05 g/cm³0.291 lb/in³
Incoloy 925 Melting Point1343°C2450°F

PropertiesMetricImperial
Tensile strength (precipitation hardened, value at room temperature)1210 MPa175000 psi
Tensile strength (@ 550°C/1020°F, precipitation hardened prior to test)970 MPa141000 psi
Yield strength (@ strain 0.200%, precipitation hardened. value at room temperature)810 MPa117000 psi
Yield strength (@ strain 0.200%, temperature 550°C/1020°F, precipitation hardened prior to test)700 MPa102000 psi
Poisson’s ratio0.2810.281
Elongation at break (precipitation hardened)24%24%

Applications of the INCOLOY® 925

  • Downhole equipment for sour or corrosive services, including packers, hangers, valves and tool joints
  • Marine and pump shafts
  • High strength fasteners
  • Chemical process industry components

 

Alloy 925 is popularly used in the petroleum industry and high-strength piping systems as well.

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