Nickel Alloy 625 pipe (UNS N06625)

We supply Alloy 625 pipes for demanding industrial applications where corrosion resistance, strength and uptime are critical. Alloy 625 is a nickel-chromium-molybdenum alloy with niobium, designed for service in severely corrosive environments and elevated temperatures. Available as single pipes or complete packages to spec.

High-quality Alloy 625 pipes

Engineered for extreme industrial demands

Corrosion resistance

Performs in severely corrosive environments

High strength

Exceptional strength without heat hardening

Pitting resistant

Eliminates pitting and crevice corrosion

Oxidation resistance

Outstanding stability at elevated temperatures

Temperature range

Reliable from cryogenic to 1800°F/982°C

Alloy 625 pipes in stock

Responsive Specificatie Tabel
Standard Material Size range Schedules
ASTM/ASME (S)B 444 UNS N06625 ½” – 6” Schedule 10S to Schedule XXS

Need Nickel Alloy 625 seamless pipe for your project? We supply UNS N06625 directly from stock or customized for project-driven demands. All deliveries include the required certified documentation to ensure full technical compliance.

625 pipe manufacturers: Nippon Steel Corporation (NSC) & Special Metals Wiggin (SMW)

Certified supply & additional information

  • EN 10204 / 3.1 certified
  • Dual certified in accordance with ASTM / ASME
  • Material in compliance to International specification
  • Random lengths or cut-to-length
  • Stock delivery times

Upon request

  • Bevelling
  • Additional testing
  • Third-party inspection

Chemical composition

The composition of Alloy 625 / UNS N06625 is designed to combine high strength with excellent corrosion resistance across a wide range of industrial environments.

Below chemical composition limits are provided for quick reference. Final compliance is confirmed on the Mill Test Certificate (EN 10204 3.1) and the applicable order specification.

Element Limit (%)
Nickel (Ni)58.0 min.
Chromium (Cr)20.0 – 23.0
Iron (Fe)5.0 max.
Molybdenum (Mo)8.0 – 10.0
Niobium + Tantalum (Nb+Ta)3.15 – 4.15
Carbon (C)0.10 max.
Manganese (Mn)0.50 max.
Silicon (Si)0.50 max.
Phosphorus (P)0.015 max.
Sulfur (S)0.015 max.
Aluminum (Al)0.40 max.
Titanium (Ti)0.40 max.
Cobalt (Co)1.0 max.
Copper (Cu)0.75 max.

Typical physical and mechanical properties of Alloy 625

The values below provide a general indication of the typical physical and mechanical properties of Alloy 625.
Property Unit Typical value
Densitylb/in³0.305
Melting range°F2350 – 2460
Specific heat at 70°FBtu/lb-°F0.098
Mean thermal expansion at 200°Fx10-6 in/in-°F7.1
Thermal conductivity at 70°FBtu-in/ft²-h-°F68
Modulus of elasticity at 70°F10³ ksi30.1
Poisson’s ratio at 70°F-0.278
Tensile strengthksi100 – 120
Yield strengthksi40 – 60
Elongation%30

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sales@maass-special-alloys.com

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+31 (0)30 8200 370