Alloy 925

Alloy 925 is a precipitation-hardenable nickel-iron-chromium alloy with additions of molybdenum, copper titanium and aluminium.

Alloy 925 has been designed to provide a combination of high strength and excellent corrosion resistance. In particular, this material demonstrates a high level of resistance to stress-corrosion cracking, pitting and crevice corrosion in both oxidising and reducing environments.

Due to the strong corrosion resistance, Alloy 925 is widely utilised for downhole and surface gas well applications.

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Specifications

  • UNS N09925
  • API6A CRA
  • NACE MR0175 (ISO 15156-3, latest revision)

About Alloy 925

Alloy 925 is an age-hardenable nickel-iron- chromium alloy that combines good high strength properties and excellent corrosion resistance. The addition of molybdenum and copper gives the alloy resistance to reducing chemicals, and to pitting and crevice corrosion. The combination of Nickel and Chromium provides protection in both oxidizing and reducing atmospheres.

The high Nickel content also gives resistance to chloride ion stress-corrosion cracking, pitting and crevice corrosion resistance is also
excellent. This alloy is often chosen for liquid and gaseous applications where a combination of high strength and corrosion resistance is required. Alloy 925 demonstrates excellent resistance to corrosion cracking caused by hydrogen sulfide in sour gas applications. Applications include down-hole and above ground components.

Applications
  • Oil and Gas - widely used for pump shafts, gas-well components, fasteners
Technical data
Chemical analysis
Carbon
0.025 Max
Manganese
1.00 Max
Copper
1.5 Min. - 3.00 Max.
Silicon
0.35 Max
Phosphorus
0.020 Max
Sulfur
0.003 Max
Nickel
42.0 Min. - 46.0 Max.
Chromium
19.50 Min. - 22.50 Max.
Molybdenum
2.50 Min. - 3.50 Max.
Aluminum
0.10 Min. - 0.50 Max.
Niobium (+ Tantalum)
0.08 Min. - 0.50 Max.
Iron
22 Max
Copper
1.50 Min. - 2.50 Max.
Physical properties
Heat Treatment
Solution Anneal at 996 – 1038°C for 30 minutes to 4 hours maximum at the set point temperature Aged 720 – 755°C for 6 to 9 hours, followed by 607 - 635°C held for total ageing time of 18 hours minimum
Size Range
Bar Stock: 12.7mm to 300mm Dia
Ingot: 300mm to 610mm Dia
Mechanical properties
Yield 0.2% Offset
110 000 psi Min
Tensile
140 000 psi Min
Elongation
18% Min
Reduction of Area
25% Min
Hardness
26-38HRC
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