Inconel 625 Specifications – ASTM B446, UNS N06625 and Alloy 625 Material Standards
SEO Title: Inconel 625 Specifications – ASTM B446, UNS N06625 & Alloy 625
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Secondary Keywords: ASTM B446 Inconel 625, UNS N06625 specification, Alloy 625 standards, Inconel 625 round bar specification, Inconel 625 material standard, Inconel 625 Grade 1, Inconel 625 Grade 2, W.Nr. 2.4856
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Meta Description: Understand Inconel 625 specifications, ASTM B446, UNS N06625 and material conditions. Contact Manan Steel & Metals for industrial alloy enquiries.
Table of Contents
- What Are Inconel 625 Specifications?
- Inconel 625 Material Identification
- ASTM B446 for Inconel 625 Round Bars and Rods
- Inconel 625 Grades and Heat-Treated Conditions
- Other Product Forms and Applicable Standards
- What Should an Inconel 625 Material Certificate Include?
- Common Specification Mistakes to Avoid
- How to Request an Inconel 625 Quotation
- Frequently Asked Questions
- Contact Manan Steel & Metals
1. What Are Inconel 625 Specifications?
Inconel 625 is a nickel-based alloy used in applications requiring a combination of corrosion resistance, mechanical strength and performance under demanding operating conditions. It is commonly identified by the following designations:
- Alloy name: Inconel 625 / Alloy 625
- UNS number: N06625
- Werkstoff number: 2.4856
When purchasing Inconel 625, identifying the grade is only the first step. Buyers must also confirm the product form, applicable material specification, heat-treated condition, dimensions, mechanical requirements and documentation.
For example, a round bar used for machining may require a different product specification from a plate used for fabrication. A correct grade designation does not automatically establish that every product meets the same standard.
2. Inconel 625 Material Identification
The following table summarises common material identifiers used when searching for or purchasing Alloy 625.
| Identifier | Description |
|---|---|
| Inconel 625 | Common alloy name |
| Alloy 625 | Alternative alloy designation |
| UNS N06625 | Unified Numbering System designation |
| W.Nr. 2.4856 | European material number |
| ASTM B446 | Specification covering certain rod and bar products, including UNS N06625 |
These identifiers help buyers and suppliers discuss the intended material. However, the material specification and required condition must still be checked against the purchase order and engineering requirements.
For technical background, refer to the official Special Metals Inconel Alloy 625 technical bulletin.
3. ASTM B446 for Inconel 625 Round Bars and Rods
ASTM B446 is an important specification to know when purchasing Inconel 625 rod and bar. ASTM International describes its scope as covering specified nickel-chromium-molybdenum-niobium alloy products, including UNS N06625, in hot-worked rod and bar and cold-worked rod forms.
The specification addresses requirements such as chemical composition, heat-treated condition, tensile properties and dimensional characteristics.
Read the official scope at ASTM International – ASTM B446.
What should buyers confirm under ASTM B446?
Before ordering Inconel 625 round bar or rod, confirm:
- The required alloy designation: UNS N06625
- The specified ASTM B446 edition or revision
- The required product form and manufacturing condition
- The applicable heat-treated grade or condition
- Diameter, length and dimensional tolerances
- Required tensile properties and testing
- Material test certificate and traceability requirements
Do not assume that a supplier’s general description of “Inconel 625 bar” proves compliance with ASTM B446. Request documentation that identifies the actual material and specification supplied.
4. Inconel 625 Grades and Heat-Treated Conditions
ASTM B446 identifies different conditions for UNS N06625 products. The selected condition matters because processing and heat treatment can influence the material’s properties.
| Grade under ASTM B446 | General condition | Typical consideration described in the standard |
|---|---|---|
| Grade 1 | Annealed | Normally used for service temperatures up to 1100°F (593°C) |
| Grade 2 | Solution annealed | Normally used above 1100°F (593°C) where creep and rupture resistance is required |
| Grade 3 | Solution annealed and cold worked | Used where higher strength is required |
These descriptions summarise the standard’s general guidance; they are not substitutes for engineering design, the full standard or the component’s service requirements. The appropriate grade must be stated and verified for the particular order.
Important: Do not treat Grade 1, Grade 2 and Grade 3 as interchangeable. Confirm the condition required by the design specification before placing an order.
5. Other Product Forms and Applicable Standards
Inconel 625 may be specified in several product forms. The applicable standard depends on the form and the exact purchasing requirement.
| Product form | Specification to investigate | Purchasing note |
|---|---|---|
| Rod and bar | ASTM B446 | Confirm product form, grade, condition and edition |
| Plate, sheet and strip | ASTM B443 | Verify the current scope and applicable requirements |
| Seamless pipe and tube | ASTM B444 | Confirm whether the required product is pipe or tube and the applicable dimensions |
| Welding products | Relevant filler-metal specification and approved welding procedure | Confirm the welding process and required filler classification |
The specifications listed above are starting points for identifying the relevant standard, not a claim that a particular item is available or compliant. Check the current standard’s scope and the purchase order before specifying a product.
For the authoritative alloy overview, consult the Special Metals Inconel technical bulletins. For formal standards, use the relevant ASTM International standards catalogue.
6. What Should an Inconel 625 Material Certificate Include?
When purchasing Inconel 625 for industrial use, buyers may require a material test certificate or other quality documentation. The exact requirements depend on the contract, specification and application.
Review the following details where applicable:
- Material identification: Inconel 625 / UNS N06625.
- Applicable standard: The correct specification and revision.
- Heat or lot number: Traceability to the supplied material.
- Chemical analysis: Reported results compared with the specified limits.
- Mechanical test results: Results required by the applicable standard and order.
- Heat-treatment condition: Documentation of the specified condition, where required.
- Dimensions and quantity: Consistency with the purchase order.
- Inspection requirements: Any additional tests, third-party inspection or documentation stated in the contract.
Not every order requires the same documents. Buyers should state their inspection and certification requirements before quotation so they can be confirmed with the supplier.
7. Common Inconel 625 Specification Mistakes to Avoid
Mistake 1: Ordering by alloy name alone
“Inconel 625” identifies the alloy but may not fully define the product. Specify the product form, standard, dimensions and required condition.
Mistake 2: Applying ASTM B446 to every product form
ASTM B446 covers defined rod and bar products. It should not automatically be applied to plates, sheets, pipes, tubes or welding products.
Mistake 3: Ignoring heat-treated condition
The required condition can affect mechanical properties and intended service. Confirm it against the drawing or engineering specification.
Mistake 4: Accepting a material certificate without checking the order
Compare the grade, standard, condition, dimensions and traceability details against the purchase order. Resolve discrepancies before accepting the material.
Mistake 5: Assuming equivalent designations guarantee compliance
UNS N06625 and W.Nr. 2.4856 are useful identifiers, but they do not independently prove compliance with every product standard or contractual requirement.
8. How to Request an Inconel 625 Quotation
For a clear and useful quotation, provide the supplier with:
- Grade: Inconel 625 / Alloy 625 / UNS N06625
- Product form: round bar, rod, plate, sheet, pipe, tube or another specified form
- Applicable ASTM or other required standard
- Dimensions, length and tolerances
- Required condition or heat treatment
- Quantity
- Material certificate and inspection requirements
- Delivery location and target schedule
For example, a request for Inconel 625 round bar to ASTM B446 should include the diameter, length, required condition, quantity and documentation requirements.
Manan Steel & Metals can be contacted to discuss your Inconel 625 requirement and request a quotation. Confirm product-form availability, compliance documents, delivery schedule and commercial terms for the specific order.
Explore the related articles:
- Inconel 625 Supplier India – Alloy 625 / UNS N06625
- Inconel 625 Properties and Chemical Composition
- Inconel 625 Applications in Industrial Equipment
Confirm that these internal links match the final published permalinks on the website.
9. Frequently Asked Questions
What is the ASTM specification for Inconel 625 round bar?
ASTM B446 is a relevant specification for specified Inconel 625 rod and bar products, including UNS N06625. Confirm the exact product form, required condition and current applicable edition.
What is the UNS number for Inconel 625?
The UNS designation for Inconel 625 is N06625.
What is the material number for Alloy 625?
The commonly used Werkstoff number is 2.4856.
Does ASTM B446 cover Inconel 625 plates and pipes?
No. ASTM B446 covers defined rod and bar products. Other product forms require the applicable specification to be checked separately.
What is the difference between Inconel 625 Grade 1 and Grade 2 under ASTM B446?
They refer to different heat-treated conditions and intended service considerations. Grade 1 is annealed, while Grade 2 is solution annealed. Confirm the required condition against the applicable standard and engineering requirements.
Is a material test certificate necessary for Inconel 625?
It depends on the purchase contract, application and quality requirements. If a certificate or specific inspection report is required, state that clearly in the enquiry and verify the documents against the supplied material.
What information should I provide when buying Inconel 625?
Provide the grade, product form, standard, dimensions, quantity, condition, documentation requirements and delivery location. This helps the supplier assess the request accurately.
10. Contact Manan Steel & Metals
Need Inconel 625 for an industrial project?
Send your product form, dimensions, applicable standard and quantity to Manan Steel & Metals to discuss your requirement and request a quotation.
Manan Steel & Metals
Address: Shop No. 2, Hira Building, 97 Khetwadi Main Road, Girgaon, Mumbai – 400004, Maharashtra, India
Phone: +91 79773 69869
Email: manansteel@gmail.com
Website: www.manansteel.com
Final material selection, specification compliance and suitability must be confirmed against the relevant standard and project requirements.
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