Alloy 625 / UNS N06625 / W.NR. 2.4856

Inconel 625


Inconel 625 is a high-performance nickel-based alloy known for its exceptional resistance to corrosion and oxidation. The addition of niobium and molybdenum enhances its strength and toughness, making it suitable for demanding applications. With its impressive fatigue strength, stress-corrosion cracking resistance, and exceptional weldability.

Inconel 625 is ideal for use in harsh and corrosive environments, including chemical processing, aerospace, marine engineering, pollution control, and nuclear reactors. Its remarkable resistance to pitting and crevice corrosion also makes it a preferred choice for various industries and applications.

Alloy 625 Inventory

Product Form Size range from Size range to

Alloy 625 pipe

0.5 in 8 in

Alloy 625 tube

12 mm 260 mm

Alloy 625 pipe fittings

0.5 in 8 in

Alloy 625 flanges

0.5 in 8 in

Industries and Applications

Inconel 625 is utilized in a variety of industries, including automotive, aerospace, oil and gas, chemical processing, marine engineering, and nuclear reactors, offering high strength and longevity in demanding applications.

In the automotive industry, Inconel 625 is utilized for heat exchangers, exhaust systems, and quick connect fittings that require high resistance to corrosive environments. In aerospace, it is commonly used in bellows, expansion joints, fasteners, and other components that require strength and durability at high temperatures.

The oil and gas industry values Inconel 625 for its exceptional resistance to pitting and crevice corrosion, making it a reliable material for use in harsh offshore environments. In chemical processing, it offers excellent resistance to corrosion, even in the presence of acidic media, making it an ideal choice for pollution-control equipment.

Marine engineering applications also benefit from Inconel 625’s resistance to corrosion, as it performs exceptionally well in seawater and other corrosive marine environments. In the nuclear industry, it is commonly used in reactors and nuclear power plants, where high-temperature stability and resistance to corrosion is critical.

Inconel 625 can be formed using various cold and hot working processes, and offers resistance to deformation at hot working temperatures. It has three heat treatments to choose from, including solution annealing, annealing, and stress relieving.

Resistance to Corrosion

The unique combination of elements in Alloy 625 provides excellent resistance to various forms of corrosion. This alloy is almost impervious to attack in mild environments such as fresh and seawater, neutral pH environments, and alkaline media. The high chromium content in Alloy 625 gives it superior resistance to oxidizing environments, while the high molybdenum content makes it highly resistant to pitting and crevice corrosion.

Fabrication and Heat Treatment 

Alloy 625 can be formed using various cold and hot working processes. Although it resists deformation at high temperatures, higher loads are required to form the material. Hot forming should be performed within a temperature range of 1700°F to 2150°F, while during cold working, the material work hardens more rapidly than traditional austenitic stainless steels. This alloy has three heat treatment options, including solution annealing, annealing, and stress relieving. Solution-annealed (grade 2) material is commonly used for applications above 1500°F where resistance to creep is important, while soft-annealed material (grade 1) is commonly used for lower temperatures and has the optimum combination of tensile and rupture properties.

Inconel 625 – Applicable Specifications

Form ASTM ASME Other Specification

Inconel 625 Sheet & Plate

B443 SB 443 AMS 5599, AMS 5869

Inconel 625 Bar

B446 SB 446 AMS 5666, AMS 5837

Inconel 625 Wire

B443 SB 443 AMS 5599, AMS 5869

Inconel 625 Pipe

B444 SB 444 ASME B36.19, ASME B36.10

Inconel 625 Fittings

B366 SB 366 ASME B16.11, MSS SP-83, MSS SP-97

Inconel 625 Forgings

B564 SB 564 AMS 5666, ASME B16.11

Common Trade Names

Alloy 625 is commonly known by its trade name, INCONEL®. This is a registered trademark of the Special Metals Corporation group of companies.

Key Properties

(in annealed condition)

Tensile strength: 120.00 – 140.00
Yield strength: 60.00 – 75.00
Elongation: 55.00 – 30.00%
Hardness: 145.00 – 220.00


Chemical Composition (%)

Element Composition
Nickel 58.0 min – 63.0 max
Chromium 20.0 – 23.0
Molybdenum 8.0 – 10.0
Iron 5.0 max
Manganese 1.0 max
Carbon 0.10 max
Silicon 0.50 max
Aluminum 0.40 – 1.0
Titanium 0.40 – 0.70
Cobalt 1.0 max
Copper 1.0 max
Sulfur 0.015 max
Phosphorus 0.015 max

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