Direct answer: UNS N06625 is the Unified Numbering System designation for nickel-chromium-molybdenum-niobium Alloy 625. Common corresponding names include Alloy 625, INCONEL alloy 625, Werkstoff Nr. 2.4856 and the European designation NiCr22Mo9Nb. These names identify a closely corresponding alloy family; they do not make every certificate, product standard or heat-treatment condition interchangeable.
Common N06625 Designations
| System | Designation | How to use it |
|---|---|---|
| UNS | N06625 | Primary alloy identity used in many ASTM and ASME specifications |
| Trade/common name | Alloy 625 / INCONEL alloy 625 | Commercial communication; trademark use should be accurate |
| German material number | 2.4856 | Common European material reference |
| EN short name | NiCr22Mo9Nb | European compositional designation |
Product Standards Are Not Equivalent Grades
A grade identifies composition; a product standard controls manufacturing route, dimensions, heat treatment, properties and testing. For N06625, common examples include ASTM B443 for plate, sheet and strip; ASTM B444 for seamless pipe and tube; ASTM B705 for welded pipe; ASTM B446 for bar; and ASTM B564 for forgings and flanges.
Why Cross-Reference Tables Need Caution
- Chemical limits can differ slightly between systems or editions.
- A standard may cover only specific product forms.
- Annealed and solution-annealed conditions can have different properties.
- ASME adoption is not implied merely because an ASTM designation is similar.
- Customer, PED, NACE or aerospace requirements can add qualification controls.
How to Write an RFQ
A strong description is: “UNS N06625 / 2.4856 Alloy 625 seamless pipe, ASTM B444 [edition], Grade 2 solution annealed, size…, EN 10204 3.1.” Add inspection, NDE, PMI, corrosion test, marking and packaging requirements.
FAQ
Is N06625 the same as Inconel 625?
N06625 is the generic UNS designation. INCONEL is a registered trademark used for products from its trademark owner; Alloy 625 is the common generic name.
Is 2.4856 always interchangeable with N06625?
They commonly correspond, but the ordered EN/ASTM specification, dimensions, condition and acceptance criteria must match.
What is the Chinese grade equivalent?
Do not approve substitution from a simple web cross-reference. Require the exact Chinese standard designation, edition and a clause-by-clause technical comparison.
Primary References
Engineering note: Values and acceptance criteria must be checked against the edition of the governing standard named in the purchase order. Application-specific design approval remains the responsibility of the purchaser or project engineer.
Post time: Sep-11-2026