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Inconel 625 Sheet Plate – Composition, Properties and Uses

Inconel 625 Sheet Plate

Inconel 625 Sheet Plate is a high-strength, corrosion-resistant material known for its incredible resistance to high temperatures and extreme environments. This alloy consists of nickel, chromium, and molybdenum and is used in various industries such as aerospace, chemical processing, and marine engineering. This blog post will provide a detailed overview of UNS 06625 Sheet Plate, discussing the composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance.


Inconel 625 Sheet Plate Composition:

Inconel 625 Plate is a nickel-based alloy that contains chrome, molybdenum, and niobium. The alloy has excellent weldability and can be easily formed and machined. The nickel content in the alloy offers excellent resistance to corrosion, crevice corrosion, and pitting. Additionally, including molybdenum provides high heat resistance, while the presence of niobium enhances the alloy’s strength.

Element Content (%)
Nickel, Ni 60
Chromium, Cr 22
Molybdenum, Mo 9
Iron, Fe 4
Niobium, Nb 3.5
Titanium, Ti 0.3
Manganese, Mn 0.3
Aluminum, Al 0.3
Silicon, Si 0.25
Carbon, C 0.05
Sulfur, S 0.003
Phosphorous, P 0.01

Inconel 625 Sheet Plate Physical properties:

Inconel 625 ASTM B443 has a density of 8.44 g/cm3 and a melting point of around 1290°C. The alloy also exhibits a high degree of thermal conductivity and electrical conductivity. Inconel 625 has a low thermal expansion coefficient, making it ideal for use in high-temperature environments. Furthermore, the alloy can withstand temperatures up to 980°C without significantly declining its mechanical properties.

Properties Metric Imperial
Density 8.44 g/cm³ 0.305 lb/in³
Melting point 1330°C 2425°F

Inconel 625 Sheet Plate Mechanical properties:

UNS 06625 Sheet has excellent mechanical properties, including high tensile strength, fatigue resistance, and hardness. The alloy’s hardness ranges between 167 to 235 HB, while the ultimate tensile strength ranges between 760 to 1100 MPa, depending on the manufacturing process used. The alloy has a yield strength of 345 MPa and an elongation of 40%.

Properties Metric Imperial
Hardness, Rockwell B (typical annealed) 95 95
Tensile strength (for flat products (<4″ thickness) and seamless tube and pipe) ≥ 827 MPa ≥ 120000 psi
Yield strength (for flat products (<4″ thickness) and seamless tube and pipe) ≥ 414 MPa ≥ 60000 psi
Elongation at break (typical annealed) 45% 45%

Inconel 625 Sheet Plate Equivalents:

AMS 5581 AMS 5837 ASTM B443 ASTM B704 GE B50TF133
AMS 5599 AMS 5879 ASTM B444 ASTM B705 MIL E-21562 (RN625)
AMS 5666 ASTM B366 ASTM B446 DIN 2.4856

Inconel 625 Sheet Plate Uses:

Inconel 625 Sheet finds application in various industries requiring high-temperature and corrosion-resistant materials. The alloy is commonly used in the aerospace industry, where it is used to manufacture components exposed to high temperatures and extreme environments. Additionally, the alloy finds application in marine engineering, chemical processing, and nuclear engineering industries.

Inconel 625 Sheet Plate Heat treatment:

Inconel 625 Sheet can be heat-treated to improve mechanical and physical properties. Common heat treatment methods include annealing, solution annealing, and quenching. Annealing the alloy at around 980°C and slowly cooling it to room temperature enhances its flexibility, increases its toughness, and stabilizes its microstructure. Solution annealing the alloy at 1090°C to 1140°C followed by quenching enhances its mechanical properties, particularly its strength.

Inconel 625 Sheet Plate The corrosion resistance:

Inconel 625 Plate has exceptional corrosion resistance in various aggressive environments. Chromium in the alloy provides corrosion resistance in acidic environments, while nickel content offers resistance in alkaline environments. Moreover, the alloy resists oxidation in high-temperature conditions, making it ideal for extreme temperatures and environments.



Inconel 625 Sheet is a versatile, corrosion-resistant, high-temperature alloy used in various industries. Its excellent physical and mechanical properties and high corrosion resistance make it ideal for use in challenging environments such as marine engineering and aerospace. Additionally, the alloy can be heat-treated to enhance its mechanical properties and can withstand high temperatures without any significant decline in its mechanical properties. With the information provided in this blog post, you can now decide whether Inconel 625 Plate is the right material for your application.

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