Nickel Alloy 625 Flanges (UNS N06625)

As part of the MAASS GLOBAL GROUP, we supply forged Alloy 625 flanges, produced by Wilhelm Maass GmbH for demanding corrosive environments. Alloy 625, commonly known as Inconel 625, offers high strength and excellent corrosion resistance without precipitation hardening. We deliver Blind, Welding Neck, and Socket Weld flanges directly from stock in Class 150, Class 300, and Class 600.

High-quality Alloy 625 flanges

Engineered for extreme industrial demands

High strength

Exceptional strength without heat hardening.

Severe corrosion

Reliable in highly corrosive environments.

Extensive stock

Blind, weld neck, socket weld.

Multiple classes

Class 150, 300 and 600.

Certified procurement

Supplied with EN 10204 certification.

Alloy 625 flanges in stock

Responsive Specificatie Tabel
Property Value
Material Alloy 625
Standard ASME B16.5
UNS N06625
Pressure classes Class 150, Class 300 and Class 600
Available sizes ½″ – 6″ (Blind & Welding Neck) / ½″ – 2″ (Socket Weld)
Product form Forged flanges

Need Alloy 625 flanges for a specific requirement? Maass supplies high-grade forged flanges directly from stock. Our inventory covers the most essential types and pressure classes to keep your critical piping systems operational.

Certified supply & additional information

  • EN 10204 3.1 documentation available where applicable
  • Additional inspection documentation available on request
  • Material supplied in accordance with applicable international specifications
  • Stock or production supply
  • Produced by Wilhelm Maass GmbH
  • Approved by DNV, Lloyd’s or NORSOK M-630 
  • Stock availability subject to current inventory

Upon request

  • Additional flange types (Slip-Ons, Threaded, Lap-Joint, Orifice, Reducing Flanges)
  • Custom manufacturing according to drawings
  • Extended sizes up to 36”
  • Higher pressure classes (Class 900, Class 1500, and Class 2500)
  • Additional testing and 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) 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 a forged Alloy 625 flange. Actual values can vary depending on size, supply condition, and order requirements.
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

Get your quote

Please fill in the contactform or send your inquiry. We’ll confirmavailability from stock or the best supply route for your lead time.

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Mail us

sales@maass-special-alloys.com

Call us

+31 (0)30 8200 370