SSS Super Alloys

Alloy 725

  1. Nickel Alloys
  2. Alloy 725

A nickel chromium molybdenum niobium alloy offering extremely high strength, excellent ductility and toughness.

In addition, alloy 725 has high corrosion resistance equivalent to alloy 625 including resistance to hydrogen embrittlement and stress corrosion cracking.

Supplied in the solution annealed and age hardened condition, Alloy 725 gains its strength through aging and can be aged to strength levels comparable to Alloy 718.

The properties of Nickel alloy 725 are useful for a wide range of applications that require outstanding corrosion resistance along with excellent strength. This grade is typically selected for use in sour gas applications.

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Specifications

  • UNS N07725
  • API6A CRA
  • ASTM B805
  • NACE MR0175 (ISO 15156-3, latest revision)

About Alloy 725

Alloy 725 was developed from Alloy 625 by adding strengthening elements to enhance its mechanical properties. The properties of Nickel alloy 725 are useful for a wide range of applications that require outstanding corrosion resistance along with high strength. Originally developed for Oil Patch applications such as well head, subsurface safety valves and other down hole components, this alloy is also used in sour gas service where it resists the effects of hydrogen sulfide, chlorides and carbon dioxide, this alloy is also approved under NACE MR0175 for use in sour gas wells. Alloy 725 is also attractive for high strength marine applications such as fasteners, where it demonstrates resistance to corrosion, pitting and crevice attack. Alloy 725 is approved under NACE MR0175 for use in sour gas wells.

Applications
  • Oil and gas - Subsea valve bodies and components, stems and fasteners
Technical data
Chemical analysis
Carbon
0.030 Max
Manganese
0.35 Max
Copper
0.50 Max
Silicon
0.20 Max
Phosphorus
0.015 Max
Sulfur
0.010 Max
Magnesium
0.010 Max
Calcium
0.003 Max
Nickel
55.0 Min - 59.0 Max
Chromium
19.00 Min - 22.50 Max
Molybdenum
7.00 Min - 9.50 Max
Aluminium
0.35 Max
Titanium
1.00 Min - 1.70 Max
Niobium + Tantalum*
2.75 Min - 4.00 Max
Niobium
2.75 Min - 4.00 Max
Cobalt
0.50 Max
Iron
Bal
Physical properties
Heat Treatment
Solution Anneal at 1024 – 1065°C for 30 minutes to 4 hours maximum at the set point temperature Aged 720 – 774°C for 4 to 9 hours, furnace cool followed by 607 - 690°C held for total ageing time of 12 hours minimum
Size range
Bar stock: 12.7mm to 300mm dia
Ingot: 300mm to 610mm dia
Mechanical properties
Yield Strength 0.2% Offset
120 000 psi Min.
Tensile
150 000 psi Min.
Elongation
20% Min.
Reduction of Area
35% Min.
Hardness
32-43HRC
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Other nickel alloys

We have a range of Nickel alloys that fully demonstrate the abilities that Nickel possesses.

Alloy 718 API
Alloy 625
Alloy 925

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