Alloy 725

Alloy 725, or Inconel® 725, is a combination of nickel, chromium, molybdenum, niobium, and titanium. This alloy offers exceptional strength, ductility and toughness. It's age-hardened, doubling the strength of annealed Alloy 625.

  • UNS Number: N07725
  • ASTM: B805
  • Other: NACE MR0715

Product availability

Round Bar

Chemical analysis



Approved for sour oil and gas wells, it meets NACE MR 1075 standards. Alloy 725 finds utility in sour gas service, demonstrating resilience against hydrogen sulfide, chlorides, and carbon dioxide.

Widely used in marine applications for:

  • Tubing hangers
  • Landing nipples
  • High strength fasteners
  • Side pocket mandrels
  • Polished bore receptacles

About Alloy 725

Alloy 725 was developed from Alloy 625 by strengthening elements to enhance its mechanical properties.

Strength is achieved through heat treatment, making it suitable for large, non-uniform sections.

Its nickel content combats stress corrosion cracking, while molybdenum and titanium enhance resistance to various acids and oxidising environments.

Alloy 725 excels in demanding conditions, offering reliability and longevity. Download the datasheet or get in touch for more information.

  • Density: 8.31 g/cm³
  • Melting Range: 1271 - 1343 °C
  • Hardness*: 36 HRC
  • Specific Heat Capacity: J/kg.°C
  • Electrical Resistivity: 1.144 µΩ.m
  • Poisson's Ratio: 0.31

Mechanical & Physical Properties

Mechanical & Physical Properties21.1°C93.3°C148.9°C204.4°C315.6°C371.1°C426.7°C537.8°C648.9°C982°C
Ultimate Tensile Strength /Mpa *12541230118911701099109611061058--
0.2% Yield Strength /Mpa *892868826824782798818778--
Reduction of area % *48.44750.252.454.253.449.647.7--
Elongation % *3229.630.930.732.430.829.631--
Coefficient of Thermal Expansion /µm/m°C-13-13.113.413.7-14.114.4-
Thermal Conductivity /kcal/(hr.m.°C)9.14310.08210.8911.70913.23514.05814.86416.2218.2421.57
Modulus of Elasticity / GPa204200-194188182-177169-
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