VDM® Alloy 625 (2.4856/N06625)

VDM® Alloy 625 is a nickel-chromium-molybdenum-niobium alloy with excellent resistance to a variety of corrosive media.

Characteristics of VDM® 625

VDM® Alloy 625 (2.4856/N06625) in the soft annealed condition (grade 1) is characterized by:

  • Exceptional resistance to pitting, crevice corrosion, erosion and intergranular corrosion
  • Immunity to chloride-induced stress corrosion cracking
  • Good resistance to mineral acids such as nitric, phosphoric, sulfuric and hydrochloric acid
  • Good resistance to alkalis and organic acids
  • Good mechanical properties 

VDM® Alloy 625 in the solution annealed condition (grade 2) is characterized by:

  • Excellent creep strength above about 600 °C (1,112 °F)
  • Good resistance to many types of hot gas corrosion, particularly chlorination 
Drilling rig

Applications of VDM® Alloy 625

The soft annealed version of VDM® Alloy 625 (grade 1) is used in the oil and gas industry, the chemical process industry, marine engineering and environmental engineering. Typical applications include:  

  • Equipment for the production of super phosphoric acid 
  • Plants for the treatment of radioactive waste
  • Production pipe systems and linings of risers in oil production 
  • Offshore industry and seawater exposed equipment 
  • Sea water piping in shipbuilding 
  • Stress corrosion cracking resistant compensators 
  • Furnace linings 

For high temperature applications up to 1,000 °C (1,832 °F), the solution treated variant (grade 2) acc. to ASME Code for Pressure Vessels is used. Typical applications include:

  • Flaring systems in refineries and offshore platforms 
  • Recuperators and compensators for hot exhaust gases 


VDM® FM 625 is used as a matching filler metal for corrosion-resistant coatings of less resistant steels (overlay welding). Typical applications include: 

  • Components in the oil and gas extraction 
  • Superheater tubes in waste incineration plants 

Available product forms

You will find a detailed list about available product forms and sizes of VDM® Alloy 625 (2.4856/N06625) in our data sheet. 

Do you have any questions? Please contact us!

VDM Metals
VDM Metals Service Line vCard
Route VDM Metals International GmbH Plettenberger Str. 2 58791 Werdohl