Inconel® 625 (Alloy 625) UNS N06625

Inconel 625 is a high strength, highly corrosion resistant nickel-chromium-molybdenum alloy used in applications in the aerospace, oil and gas, automotive, marine, chemical processing and nuclear industries where strength at high temperature are required (between 1200° F - 1400° F). Inconel 625 also has resistance to various aqueous media causing localized corrosion, stress corrosion cracking and other forms of attack.

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Inconel 625 (Nickel 625) Strip, Foil, Wire, AMS 5599, AMS 5979, ASTM B443 Gr1 or Gr2

Gr1 -Annealed condition for service temps up to 1100 °F

Gr2 - Solution annealed for service temps above 1100 °F where resistance to creep and rupture is required

Inconel 625 Applications

What is Inconel 625?

Inconel Alloy 625 is a non-magnetic, corrosion and oxidation resistant, nickel-chromium alloy. The high strength of Inconel 625 is the result of the stiffening combination of molybdenum and niobium on the nickel chromium base of the alloy. Inconel 625 has tremendous resistance to a wide range of unusually severe corrosive environments including high-temperature effects such as oxidation and carburization. Its outstanding strength and toughness in temperature ranges from cryogenic temperatures to high temperature up to 2000° F (1093° C) are derived primarily from the solid solution effects of the refractory metals Columbium and molybdenum in a nickel-chromium matrix. Nickel chromium alloy 625 has excellent resistance to pitting and crevice corrosion, high corrosion-fatigue strength, high tensile strength as well as resistance to stress corrosion cracking to chloride ions — making it an excellent choice for sea-water applications. Inconel is used in aerospace applications as well as marine applications. Common applications for this alloy are springs, seals, bellows for submerged controls, electrical cable connectors, fasteners, flexure devices, and oceanographic instrument components.

Nickel Alloy 625 Chemical Composition

Nickel: 58.00 min
Chromium: 20.0-23.0
Iron: 5 max
Molybdenum: 8.0-10.0
Columbium + Tantalum: 3.15-4.15
Manganese: 0.50 max
Carbon: 0.10 max
Silicon: 0.50 max
Phosphorus: 0.015 max
Sulfur: 0.015 max
Aluminum: 0.40 max
Titanium: 0.40 max
Cobalt: 1 .00 max

Physical Properties of Inconel 625

Density: 0.305 lbs/in3, 8.44 g/cm3Mean

Coefficient of Thermal Expansion: in/in/° F (m/m/°C)

68 -400 °F (20 -204 °C): 7.3 x 10·6 (13.1)
68 -600 °F (20 -315 °C): 7.5 x 10·6 (13.5)
68 -800 °F (20 -427 °C): 7.7 x 10·6 (13.9)

Magnetic Permeability H= 200 Oersted

Annealed: 1.0006

Modulus of Elasticity: ksi (MPa) in Tension
30.2 X 103 (208 X 103)

Melting Range: 2350 -2460 ° F (1290 -1350 °C)


Nickel Coil Product Forms

  • Inconel 625 Strip Coil
  • Inconel 625 Foil Coil
  • Nickel Alloy 625 Ribbon Coil

Nickel Wire Product Forms

  • Nickel 625 Shaped & Profile Wire
  • Inconel 625 Round Wire
  • Alloy 625 Flat Wire
  • Inconel 625 Square Wire

Mechanical Properties of Alloy 625 at Room Temperature

Typical Annealed Properties of Inconel 625

Ultimate Tensile Strength: 120 KSI min (827 MPa min)
Yield Strength: (0.2% offset) 60 KSI min (414 MPa min)
Elongation: 30% min ( gauges > 0.040inched

Properties: Tempered

lnconel® 625 can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Additional Properties

Corrosion Resistance of Alloy 625

Refer to NACE (National Associate of Corrosion Engineers) for recommendations.


#1 - Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.
#2D - Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process. #2B - Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.
#BA- Bright annealed cold rolled and bright annealed
#CBA- Course bright annealed cold rolled matte finish and bright anneal
#2 - Cold Rolled
#2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part. Polished - Various grit finish for specific polish finished requirements.
* Not all finishes are available in all alloys - Contact Ulbrich Sales for more information.

Wire Finishes

XC - Extra Clean Bright Annealed or Bright Annealed and Cold Rolled Grease - Ultra bright finish (for decorative applications) Soap - Soap coating on tempered wire to act as lubricant. * Contact Wire Sales for custom wire finishes.

Heat Treatment

lnconel® 625 cannot be hardened heat treating.

Welding Inconel 625

Inconel 625 has excellent weldability and brazeability

For more weldability data, refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods".

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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