Inconel 625

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Product Description

Inconel 625

Inconel 625

  • outstanding resistance to pitting, crevice corrosion, erosion and intergranular attack
  • almost complete freedom from chloride-induced stress-corrosion cracking
  • good resistance to mineral acids, such as nitric, phosphoric, sulphuric and hydrochloric acids
  • good resistance to alkalis and organic acids
  • good mechanical properties

Density: 8.44

Corrosion resistance

For optimal corrosion resistance the material must be in a clean condition and free from all kinds of contaminants before any fabricated component is placed into service. Under these conditions Inconel 625 Alloy exhibits excellent corrosion resistance in a wide variety of media:

  • excellent resistance to pitting and crevice corrosion in chloride-bearing media
  • essentially resistant to chloride-induced stress-corrosion cracking
  • high resistance against impingement and erosion corrosion
  • high resistance to corrosive attack by mineral acids, such as nitric, phosphoric, sulphuric and hydrochloric acids, as well as to alkalis and organic acids in both oxidizing and reducing conditions
  • practically no corrosive attack in marine and industrial atmosphrers. High resistance to seawater and brackish water, even at higher temperatures
  • high resistance against intergranular corrosion following thermal treatment and welding

The solution-annealed version (grade 2) shows good resistance to many corrosive gas atmospheres:

  • good resistance to carburization and to oxidation under resistance to nitridation
  • good resistance to halogen containing gases and to hydrogen chloride

Applications of Inconel 625:

The soft-annealed version of Nicrofer 6020 hMo (grade 1) is preferred for applications in the chemical process industry, in marine engineering and in pollution control equipment for environmental protection.

Typical applications are:

  • superphosphoric acid production equipment
  • nuclear waste reprocessing equipment
  • sour gas production tubes
  • piping systems and sheathing of risers in oil exploration
  • offshore industry and marine equipment
  • flue gas scrubber and damper components
  • chimney linings

For high-temperature applications, up to approximately 1000 ℃, the solution-annealed version of alloy 625 (grade 2) can be used in accordance to the ASME code for pressure vessels. For design calculations for equipment for use within the temperature range of approximately 500 -1000 ℃ the loss in ductility resulting from prolonged exposure within that temperature range must be kept in mind

  • components in waste gas systems and waste gas cleaning plants exposed to higher temperatures
  • flare stacks in refineries and offshore platforms
  • recuperators and compensators
  • ubmarine diesel engine exhaust systems
  • superheater tubes in waste incineration plants
  • cladding of waterwall sections and superheater tubes in waste incineration plants by overlay welding

Chemical composition

Ni Cr Fe C Mn Si Mo Co Al Ti Nb P S
min(%) bla 20.0 8.0 3.15
max(%) 23.5 5.0 0.10 0.50 0.50 10.0 1.0 0.40 0.40 4.15 0.015 0.015

Mechanical properties

Condition Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Hardness(HB)
ASTM Min Value Soft Annealed 413 827 30
Typical Values at RT Hot worked 588 980 45 210
Typical Values at RT Soft Annealed 539 931 45 180

International Specification Comparison chart

Material Round Bar Plate Pipe
Seamless Welded
B446 B443 B444 B704/705
ASME SB446 SB443 SB444
JIS NCF625 H4553 G4901 H4552
DIN 2.4856 17752 17750 17751


Product: Sheet, Coil, Pipe, Bar, Wire and Forgings