Alloy 625 

2.4856 / UNS N06625 / NiCr22Mo9Nb


Material description:

Alloy 625 is a corrosion-resistant nickel-chromium-molybdenum alloy has good resistance properties even at elevated temperatures. Its high nickel, chromium and molybdenum contents promote good resistance to chlorine-induced stress-crack corrosion as well as pitting and crevice corrosion.
Alloy 625 Grade 1 describes the alloy in annealed and Grade 2
the solution annealed form.
Due to its outstanding hot-strength and wear properties combined with its good resistance to oxidation and carburization, Alloy 625 can be
used at temperatures of up to 1000 °C. For application temperatures above 600 °C, the solution annealed finish should be selected. In the
temperature range between approx. 650 °C and 850 °C, this alloy has a tendency to become brittle. This must be taken into account in the design of the product/ equipment.


  • Offshore engineering plants/equipment
  • Plants for the manufacture or processing of sulfuric,
    phosphoric, nitric, hydrofluoric and hydrochloric
    acid, as well as organic acids and alkali
  • Flue gas purification systems
  • Plants for the processing of oil and natural gas


8,44 g/cm3

Chemical analysis in weight %

C Max.0,03 %
Cr 21,0 - 23,0 %
Fe Max.5,0 %
Si Max.0,40 %
Mn Max.0,5 %
Ti Max.0,4 %
Mo 8,0 - 10,0 %
Nb/Ta 3,2 - 3,8 %
Co Max.1,0 %
Al Max.0,4 %
Ni Bal.


Round bar

Diameter: Length:
6 - 330 mm R/L's alt. cut fix lengths.


Diameter: Size:
0,50 - 50,8 mm Standard, cut or sawn

Welding consumables

Suitable welding filler metal after inquiry.

Zapp Precision Metals GmbH High Performance Alloys are certified to ISO 9001 and EN 9120 (Aerospace).
Subject to typing errors.