Square Grid

Alloy 725

A nickel-chromium-molybdenum-niobium aged hardenable grade, Alloy 725 has extremely high strength.

With addition of aluminium and titanium, Alloy 725 has high strength, ductility and toughness. In addition, the alloy has high corrosion resistance including resistance to hydrogen embrittlement and stress corrosion cracking.


Product form Size range from Size range to
Alloy 725 round bar 25.4 mm 76.2 mm

Can't find the product you need? Please contact us directly."

  • Gallery Image

    Round Bar

Chemical Analysis

% C Si Mn P S Cr Ni Mo Nb+Cb Ti Fe Al
Min - - - - - 19 55 7 2.75 1 Balance -
Max 0.03 0.20 0.35 0.015 0.010 22.50 59 9.50 4 1.70 Balance 0.35


Gallery Image

Perfect for applications in the Petrochemical & Refinery sector

Alloy 725 can be used in a variety of applications including:

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

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. The alloy is used in sour gas service where it resists the effects of hydrogen sulfide, chlorides and carbon dioxide.

Alloy 725 is also attractive for high strength fasteners in marine applications, where it resists corrosion, pitting and crevice attack in sea water.

Contact us to learn more about Alloy 725!


8.31 g/cm³
Melting Range:
1271 - 1343 °C
36 HRC
Specific Heat Capacity:
Electrical Resistivity:
1.144 µΩ.m
Poisson's Ratio:


UNS Number:
ASTM B805, NACE MR0715
Download the Alloy 725 Data Sheet Download

Request a Quote

Fill in our online form to get a fast quote. Got a question? Contact us on [email protected]