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Inconel 625 Sheet & Plate

Inconel 625 Sheet & Plate (UNS N06625,2.4856)

Inconel 625 Sheet & Plate (UNS N06625, 2.4856) is a high-performance nickel-chromium alloy known for its exceptional resistance to high-temperature oxidation, corrosion, and a wide range of aggressive environments. It is particularly noted for its ability to withstand extreme environments, including those in aerospace, chemical processing, marine, and nuclear industries. Inconel 625 maintains its strength, toughness, and flexibility at temperatures ranging from cryogenic to 980°C (1800°F), making it a versatile material for demanding applications where other materials might fail.

 

Key Properties

  • Corrosion Resistance: Superior resistance to oxidation, pitting, and crevice corrosion in both marine and chemical environments, including seawater, acids, and alkalis.
  • High-Temperature Strength: Maintains high strength and resistance to thermal fatigue and creep at temperatures up to 980°C (1800°F).
  • Fatigue and Thermal Fatigue Resistance: Excellent performance under cyclic conditions, providing long-term durability in harsh operational environments.
  • Weldability: Easily welded using standard techniques with good results, even in extreme conditions.
  • Versatility: Retains good mechanical properties in cryogenic conditions, as well as at high temperatures, making it suitable for a wide range of applications.

 

Technical Specifications

  • UNS: N06625
  • DIN: 2.4856

Available Thickness

3/16″1/4″3/8″1/2″5/8″3/4″1″
4.8mm6.3mm9.5mm12.7mm15.9mm19mm25.4mm
1 1/4″1 1/2″1 3/4″2″2 1/2″3″
31.8mm38.1mm44.5mm50.8mm63.5mm76.2mm

 

inconel-625-sheet-plate

Application

  • Automotive
  • Chemical and Pharmaceutical
  • Fertilizer
  • Food Processing and Handling
  • Manufacturing
  • Mining
  • Oil & Gas
  • Phosphate Mining

Standard

  • ASTM A240 / A240M
  • ASTM A276 / A276M
  • ASTM A312 / A312M
  • ISO 15510
  • EN 10088-2
  • IN 10204
  • HE G4304
  • HE G4305
  • ASME SA240 / SA240M

Equivalent Grade for Nickel 625

StandardCountry/RegionGrade
UNSUnited StatesN06625
ASTMUnited StatesB443, B444, B446, B704, B705
AMSUnited States5666, 5599, 5837
DIN/ENGermany/Europe2.4856
AFNORFranceNC22DNb
BSUnited KingdomNA21
ISOInternational6208
GOSTRussiaХН75МБТЮ (ХН67МБТЮ)
JISJapanNCF625

Hastelloy 625 Chemical Composition

ElementPercentage (%)
Nickel (Ni)58.0 min
Chromium (Cr)20.0 – 23.0
Molybdenum (Mo)8.0 – 10.0
Iron (Fe)5.0 max
Niobium (Nb)3.15 – 4.15
Tantalum (Ta)0.5 max
Titanium (Ti)0.4 max
Aluminum (Al)0.4 max
Cobalt (Co)1.0 max
Manganese (Mn)0.5 max
Silicon (Si)0.5 max
Phosphorus (P)0.015 max
Sulfur (S)0.015 max
Carbon (C)0.10 max

Hastelloy 625 Physical Properties

PropertyValue
Density8.44 g/cm³ (0.305 lb/in³)
Melting Point1,290 – 1,350°C (2,354 – 2,462°F)
Thermal Conductivity9.8 W/m·K (68.0 BTU·in/ft²·h·°F) at 21°C (70°F)
Specific Heat Capacity0.418 J/g·K (0.100 cal/g·°C) at 21°C (70°F)
Electrical Resistivity1.29 µΩ·m at 21°C (70°F)
Modulus of Elasticity207 GPa (30 x 10⁶ psi)
Poisson’s Ratio0. Poisson’s Ratio3 at 21°C (70°F)
Coefficient of Thermal Expansion12.8 µm/m·°C (7.1 µin/in·°F) from 21 to 100°C (70 to 212°F)
Hardness180-240 HB (Brinell hardness)
Tensile Strength827 MPa (120 ksi) min
Yield Strength (0.2% offset)414 MPa (60 ksi) min
Elongation30% min

Hastelloy 625 Mechanical Properties

PropertyValue
Tensile Strength827 MPa (120 ksi) min
Yield Strength (0.2% offset)414 MPa (60 ksi) min
Elongation30% min
Hardness (Brinell)180 – 240 HB
Hardness (Rockwell C)30 – 40 HRC
Fatigue Strength275 MPa (40 ksi) (for 10⁷ cycles)
Modulus of Elasticity207 GPa (30 x 10⁶ psi)
Poisson’s Ratio0. Poisson’s Ratio3
Shear Modulus82.6 GPa (12 x 10⁶ psi)
Impact Strength102 J (75 ft·lbf)
Reduction in Area40%
Creep Strength (at 650°C/1200°F)58 MPa (8.5 ksi) (for 10,000 hours)

Fabrication Data

  • Welding: Alloy 625 is weldable using various techniques like TIG (Tungsten Inert Gas), MIG (Metal Inert Gas), and SMAW (Shielded Metal Arc Welding). Preheating is generally not required, but post-weld heat treatment can be performed if needed.
  • Machining: It can be machined using conventional methods, but due to its high strength and work-hardening characteristics, it may require carbide tooling and slower speeds.
  • Heat Treatment: It is typically used in the solution-annealed condition, which is achieved by heating to around 980°C (1800°F) and then cooling rapidly.

Corrosion Resistance

Oxidation Resistance:

  • Nickel 625 has excellent resistance to oxidation at high temperatures, up to 1800°F (982°C).
  • The alloy forms a stable oxide layer that protects it from further corrosion.

Resistance to Aqueous Corrosion:

  • The high levels of chromium and molybdenum give Nickel 625 outstanding resistance to a wide range of corrosive environments, including seawater, industrial chemicals, and various acidic conditions.
  • It is particularly resistant to pitting, crevice corrosion, and intergranular attack.

Resistance to Stress Corrosion Cracking (SCC):

  • Nickel 625 exhibits excellent resistance to stress corrosion cracking, especially in chloride-containing environments.
  • This makes it suitable for applications in marine environments, chemical processing, and aerospace.

Resistance to Reducing and Oxidizing Acids:

  • The alloy is resistant to reducing acids like phosphoric acid and sulfuric acid, as well as oxidizing acids like nitric acid.
  • This resistance extends to a variety of organic acids and aggressive agents such as chlorides and sulfides.

Sulfuric Acid Resistance:

  • Nickel 625 performs well in dilute sulfuric acid environments, making it useful in various chemical processes.

Seawater Resistance:

  • Due to its high molybdenum content, Nickel 625 offers superior resistance to seawater corrosion, making it ideal for marine and offshore applications.
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