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Nickel Alloy: Inconel 625

Inconel 625 (UNS N06625)

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Penn Stainless inventory includes Inconel 625 grade (UNS N06625) in plate, round bar, square bar, hex bar, and rolled flat bar.


INCONEL® nickel-chromium alloy 625 (UNS N06625) is used for its high strength, ease of fabrication and joining, and outstanding corrosion resistance.  Service temperatures range from cryogenic to 1800° F (982°C).



Some typical applications are:

  • Barge and tank truck liners
  • Carburizing atmospheres
  • Ethylene dichloride crackers
  • Furnace trays, mufflers, hangers
  • Gasoline stabilizer production


STANDARDS Inconel 625

ASTM/ASME ……………. UNS N06625

DIN……………………….   2.485


  • The high alloy content of INCONEL alloy 625 enables it to withstand a wide variety of severe corrosive environments.
  • In mild environments such as the atmosphere, fresh and sea water, neutral salts, and alkaline media there is almost no attack.
  •  In more severe corrosive environments the combination of nickel and chromium provides resistance to oxidizing chemicals, whereas the high nickel and molybdenum contents supply resistance to nonoxidizing environments.
  • The high molybdenum content also makes this alloy very resistant to pitting and crevice corrosion, and niobium acts to stabilize the alloy against sensitization during welding, thereby preventing subsequent intergranular cracking.
  • The high nickel content provides freedom from chloride ion stress-corrosion cracking.


  • INCONEL alloy 625 is readily joined by conventional welding processes and procedures. INCONEL Filler Metal 625 and INCONEL Welding Electrode 112 are nickel-chromium-molybdenum products designed for welding INCONEL alloy 625 to itself and to other materials.
  • Like alloy 625, deposited weld metals from both products are highly resistant to corrosion and oxidation and have high strength and toughness from the cryogenic range to 1800°F. They require no postweld heat treatments to maintain their high strength and ductility.



  • Hot- or cold-formed parts are usually annealed at 1700°-1900°F for times commensurate with thickness; higher temperatures may be used to soften material for additional cold work.

INCONEL alloy 625 is solution-treated at 2000°-2200°F. These temperatures are metal temperatures based on batch operations and may not apply to continuous annealing, which normally consists of short exposure in the hot zone of a furnace set at higher temperatures.

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Chemical Properties:

C Mn Si Co S Cr Ni
0.1 max

0.5 max

0.5 max


min: 20.0
max: 23.0

min: 58.0

Mechanical Properties:

Grade Tensile Strength (mPa) min Yield Strength 0.2% offset (MPa) min Elongation (% in 50mm) min Hardness (Brinell) MAX Hardness (Rockwell B) MAX






Physical Properties:

Coefficient of
Thermal Expansion (min/in)-°F
Thermal Conductivity BTU/hr-ft-°F Melting Range
at 68 °F at 68 – 212°F at 68 – 1832°F at 68 – 212°F
(20 – 100°C)
°F °C
0.305 7.11 ? 68 2350-2460 1290-1350

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