What Is Inconel 625? Alloy 625, UNS N06625 & 2.4856 Explained
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Table of Contents
- What Is Inconel 625?
- Inconel 625 International Designations
- What Is Inconel 625 Made Of?
- Key Properties of Inconel 625
- Where Is Inconel 625 Used?
- Inconel 625 Round Bar
- ASTM B446 for Inconel 625
- Why Industries Choose Inconel 625
- How to Buy Inconel 625
- Why Source Inconel 625 from Manan Steel & Metals?
- Frequently Asked Questions
- Request an Inconel 625 Quotation
What Is Inconel 625?
Inconel 625 is a nickel-chromium-molybdenum-niobium alloy used for engineering applications that require a combination of high strength, corrosion resistance and fabricability.
The alloy is commonly identified as:
- Inconel 625
- Alloy 625
- UNS N06625
- Werkstoff 2.4856
- NiCr22Mo9Nb
Special Metals identifies INCONEL alloy 625 as UNS N06625 and Werkstoff Number 2.4856. Its technical documentation also lists rod, bar, wire, plate, sheet, strip, tubular products and forging stock among available product forms.
For industrial buyers, understanding these different names is important because customers in different countries may use different designations for the same alloy.
Inconel 625 International Designations
A buyer searching for Inconel 625 may encounter several different material names.
| Identification System | Inconel 625 Designation |
|---|---|
| Commercial Name | Inconel 625 |
| Common Alloy Name | Alloy 625 |
| UNS | N06625 |
| Werkstoff Number | 2.4856 |
| EN designation | NiCr22Mo9Nb |
| Alloy Family | Nickel-Chromium-Molybdenum-Niobium |
| Common Product Form | Round Bar / Rod |
Voestalpine also identifies Alloy 625 as 2.4856 / NiCr22Mo9Nb / UNS N06625.
Including the UNS number in a purchase enquiry can make material identification clearer, especially when dealing with international suppliers and engineering specifications.
What Is Inconel 625 Made Of?
The performance of Inconel 625 comes from its nickel-chromium-molybdenum-niobium alloy system.
The major alloying elements include:
| Element | Typical Specification |
|---|---|
| Nickel | 58.0% minimum |
| Chromium | 20.0–23.0% |
| Molybdenum | 8.0–10.0% |
| Niobium + Tantalum | 3.15–4.15% |
| Iron | 5.0% maximum |
| Carbon | 0.10% maximum |
| Manganese | 0.50% maximum |
| Silicon | 0.50% maximum |
The exact chemistry should always be verified against the applicable material specification and material test certificate for the supplied product.
Special Metals’ technical bulletin identifies Inconel 625 as a nickel-chromium alloy strengthened primarily through the stiffening effect of molybdenum and niobium in the nickel-chromium matrix.
Key Properties of Inconel 625
The reason Inconel 625 is specified for demanding industrial applications is its combination of properties.
High Strength
Inconel 625 provides useful mechanical strength for components exposed to substantial mechanical loading.
The alloy can achieve strength through its alloying system without depending on precipitation hardening as its primary strengthening mechanism.
Corrosion Resistance
One of the most important characteristics of Inconel 625 is its resistance to a wide range of corrosive environments.
This makes it relevant to:
- Marine equipment
- Chemical processing
- Oil and gas equipment
- Offshore systems
- Process equipment
Resistance to Localized Corrosion
Inconel 625 is valued for resistance to forms of localized corrosion such as pitting and crevice corrosion in appropriate environments.
This is particularly relevant where chloride-containing environments are encountered.
High-Temperature Capability
The alloy is also used in elevated-temperature applications where strength and resistance to oxidation or aggressive environments are required.
Fabricability
Another important characteristic is its fabricability.
Special Metals describes Inconel 625 as offering high strength, excellent fabricability and outstanding corrosion resistance.
Where Is Inconel 625 Used?
Inconel 625 has applications across several demanding industrial sectors.
Oil and Gas
The alloy is used in selected oil and gas equipment, including components exposed to demanding corrosive environments.
Applications can include:
- Flowlines
- Connectors
- Downhole components
- Offshore equipment
- Pumps
- High-pressure components
Voestalpine lists flowlines, connectors, pumps and high-pressure components among Alloy 625 applications.
Chemical Processing
Chemical-processing equipment can require materials capable of handling aggressive environments.
Inconel 625 is used for selected:
- Process equipment
- Piping components
- Heat-exchanger components
- Valves
- Pumps
- Chemical plant components
Marine Engineering
Seawater and chloride exposure can create demanding corrosion conditions.
Inconel 625 is used for selected marine and offshore applications where its corrosion resistance and strength are appropriate.
Aerospace
Inconel 625 is also relevant to aerospace applications requiring a combination of high-temperature performance, strength and corrosion resistance.
Industrial Equipment
The alloy can be used for:
- Shafts
- Fasteners
- Pins
- Fittings
- Valve components
- Pump components
- Machined parts
- High-temperature hardware
The final material selection should always be based on the actual service environment and engineering specification.
Inconel 625 Round Bar
Inconel 625 Round Bar is an important product form for manufacturers requiring nickel-alloy material for machining.
Round bar can be processed into components such as:
- Shafts
- Pins
- Bushings
- Fasteners
- Valve components
- Pump components
- Fittings
- Studs
- Custom machined parts
For procurement, a typical requirement can be written as:
Inconel 625 / UNS N06625 / Round Bar
The buyer should then specify the required:
- Diameter
- Length
- Quantity
- Condition
- Standard
- Testing
- Certification
This gives the supplier enough information to evaluate the requirement.
ASTM B446 for Inconel 625
For buyers purchasing Inconel 625 Round Bar, ASTM B446 is an important specification.
The current ASTM B446-26 covers nickel-chromium-molybdenum-niobium alloy UNS N06625 in hot-worked rod and bar and cold-worked rod forms. It also defines requirements relating to chemical composition, heat treatment, tensile properties, dimensions and straightness.
ASTM B446-26 identifies different heat-treated conditions for UNS N06625 products, including Grade 1 annealed and Grade 2 solution annealed conditions.
Therefore, an industrial enquiry should not simply say:
“Inconel 625 bar required.”
A more precise requirement would be:
Inconel 625 Round Bar – UNS N06625 – ASTM B446
along with the required dimensions and condition.
For the official specification, buyers can refer to ASTM B446-26.
Why Industries Choose Inconel 625
Inconel 625 is generally considered when ordinary engineering materials may not provide the required combination of properties for the intended service.
Its advantages include:
Strong Corrosion Resistance
Useful in selected aggressive environments.
High Strength
Suitable for components exposed to significant mechanical loading.
Marine and Offshore Capability
Relevant to seawater and offshore equipment where its properties are appropriate.
Elevated-Temperature Performance
Suitable for selected high-temperature applications.
Good Fabricability
Its processing and joining characteristics expand its use beyond simple machined components.
Multiple Product Forms
Special Metals identifies availability in forms including rod, bar, wire, plate, sheet, strip, tubular products and forgings.
How to Buy Inconel 625
When purchasing Inconel 625, provide the supplier with enough information to identify the exact requirement.
Material
Inconel 625 / Alloy 625 / UNS N06625
Product Form
For example:
Round Bar
Standard
For round bar:
ASTM B446, where applicable.
Dimensions
Provide:
- Diameter
- Length
- Tolerance
Quantity
State:
- Kilograms
- Pieces
- Total bar length
Condition
Specify the required material condition if the project calls for one.
Documentation
Mention requirements such as:
- MTC
- Chemical analysis
- Mechanical test results
- Inspection certificate
- PMI
- Third-party inspection
Application
Mentioning the application can also help the supplier understand the requirement.
For example:
Application: Offshore Pump Component
Why Source Inconel 625 from Manan Steel & Metals?
Manan Steel & Metals is a Mumbai-based supplier of specialty metals and industrial alloy products.
Manan’s published product information includes Inconel 625 Round Bar, confirming the material is part of its listed product range.
For an Inconel 625 enquiry, buyers can provide:
- Grade
- UNS number
- Diameter
- Length
- Quantity
- Standard
- Condition
- Application
- Documentation requirements
This allows the requirement to be evaluated before quotation.
Explore the Manan Steel & Metals Inconel 625 Round Bar page for product information.
You can also visit the Manan Steel & Metals website for additional specialty-metal products.
Frequently Asked Questions
What is Inconel 625?
Inconel 625 is a nickel-chromium-molybdenum-niobium alloy used for applications requiring a combination of strength, corrosion resistance and fabricability.
What is the UNS number of Inconel 625?
The UNS number is N06625.
What is the Werkstoff number of Inconel 625?
The Werkstoff number is 2.4856.
What is Alloy 625?
Alloy 625 is another designation used for Inconel 625.
What is the EN designation of Inconel 625?
A commonly used EN material designation is NiCr22Mo9Nb.
What standard covers Inconel 625 Round Bar?
ASTM B446 covers UNS N06625 rod and bar products within its stated scope.
Where is Inconel 625 used?
Applications include selected oil and gas, chemical-processing, marine, offshore, aerospace and industrial equipment applications.
Does Manan Steel & Metals supply Inconel 625?
Yes. Inconel 625 Round Bar is listed on Manan Steel & Metals’ website.
Request an Inconel 625 Round Bar Quotation
Looking for Inconel 625 Round Bar Supplier India?
Send your requirement to Manan Steel & Metals.
Material: Inconel 625 / Alloy 625
UNS: N06625
Product: Round Bar
Specification: ASTM B446 / Project Specification
Diameter: ______ mm
Length: ______ mm
Quantity: ______ kg / Nos.
Condition: ______
Testing: ______
MTC: ______
Delivery Location: ______
Manan Steel & Metals
Shop No. 2, Hira Building,
97 Khetwadi Main Road (Nanubhai Desai Road),
Girgaon, Mumbai – 400004, Maharashtra, India
Phone: 7977369869
Email: manansteel@gmail.com
Website: https://www.manansteel.com/
Send your Inconel 625 requirement today for availability and quotation.