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2.4652, 2.4631, and 2.4952 are three designations for the same alloy: NiCr20TiAl, a precipitation-hardening nickel-chromium superalloy. 2.4652 is used in EN 10269 (fasteners). 2.4631 is used in EN 10302 (creep-resisting structural parts). 2.4952 is a legacy German W.Nr. designation found in pre-1990 drawings. The North American equivalent is UNS N07080 per ASTM B637. All four refer to the same material — Ni ~72–76%, Cr 18–21%, Ti 1.8–2.7%, Al 1.0–1.8% — with a maximum continuous service temperature of 815 °C and tensile strength of 1,100–1,400 MPa in the +AT condition. Source: Jiangsu Liangyi Co., Limited, ISO 9001:2015 certified NiCr20TiAl forging manufacturer, Jiangyin, China — 25+ years production experience.
2.4652, 2.4631, and 2.4952 all refer to the same NiCr20TiAl precipitation-hardening nickel superalloy. The difference is purely which European standard or archive system uses each number — not any difference in chemistry or microstructure. The correct number to write on your drawing depends on which standard governs your component type, not on the material itself.
Why Does One Alloy Have Multiple Numbers?
The confusion around NiCr20TiAl designations is not a manufacturer problem — it is a standards harmonisation problem that predates most practising engineers. Here is why it happened.
In post-war European industry, alloy numbering was managed nationally. Germany's Werkstoffnummer (W.Nr.) system assigned numbers based on material family and sequence. As new application-specific European standards were written — covering fasteners, creep-resisting parts, and structural forgings separately — the same alloy was registered under different numbers in each standard, because each standards committee worked from its own registry.
When the European Committee for Standardization (CEN) later consolidated these into EN standards, the legacy numbers were preserved rather than unified, to avoid invalidating millions of archived engineering drawings. The result: three Werkstoffnummer designations for one alloy that every purchasing engineer, metallurgist, and inspection team must now navigate.
At Jiangsu Liangyi, we manufacture from a single qualified NiCr20TiAl composition and heat treatment programme. We certify the finished forging against whichever designation number appears on your drawing — 2.4652, 2.4631, 2.4952, or N07080 — from the same material heat, with no change to the production process.
Standard-by-Standard Breakdown
Each designation maps to a specific document with a defined application scope. Knowing which standard governs your component tells you the right number to specify.
2.4652 — EN 10269 (Fasteners at Elevated Temperature)
EN 10269:1999 covers "Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties." The 2.4652 designation appears in Table 5 of that standard, governing composition and minimum mechanical properties for precipitation-hardened fasteners in continuous service up to 815 °C.
If your component is a high-temperature fastener — flanges in steam turbines, hot-section bolting in gas turbines, boiler stud bolts, or valve bonnets — 2.4652 is the correct designation for your drawing.
2.4631 — EN 10302 (Creep-Resisting Structural Components)
EN 10302:2008 covers "Creep resisting steels, nickel and cobalt alloys." This is the document for structural components under sustained load at elevated temperature: turbine discs, valve bodies, compressor housings, seamless rings, and forged bars for high-temperature service.
If your component is a forged structural part — a turbine disc, a valve seat, a compressor ring, an exhaust valve body — 2.4631 is the appropriate designation.
2.4952 — Legacy Werkstoffnummer
The number 2.4952 pre-dates the EN harmonisation era. It originated in the German steel and nickel alloy numbering registry (Verein Deutscher Eisenhüttenleute, VdEh). You will encounter it in:
- Pre-1990 German engineering drawings and maintenance manuals
- Legacy power plant documentation, especially German and Austrian utilities
- Older academic references and metallurgy textbooks
- Some Eastern European industrial standards harmonised to German practice
The number 2.4952 carries no compositional or property differences from 2.4652 or 2.4631. It simply reflects when the drawing was created. Jiangsu Liangyi can produce an EN 10204 3.1 mill certificate that cross-references the legacy number for customers who need document continuity during plant overhauls.
UNS N07080 — ASTM B637 / AMS 5667
ASTM B637 covers "Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock." The UNS identifier N07080 is used in all ASTM procurement documents, in AMS 5667, and across ASME code projects globally. This is the number used in North American engineering practice — across the US, Canada, and increasingly in Southeast Asian industries working to ASME codes.
Jiangsu Liangyi can produce dual-certified material carrying both a European Werkstoffnummer and the UNS N07080 designation simultaneously when customers need cross-regional compliance.
Full Designation Comparison Table
| Designation | Governing Standard | Application Scope | Primary Region | Use When… |
|---|---|---|---|---|
| 2.4652 | EN 10269 : 1999 | Fasteners — bolts, studs, nuts, threaded rods > 300 °C | EU, UK, Japan, Korea | Component is a high-temperature fastener |
| 2.4631 | EN 10302 : 2008 | Structural creep-resisting parts — discs, rings, valve bodies, bars | EU, UK, Scandinavia | Component is a forged structural part under creep load |
| 2.4952 | Legacy VdEh / W.Nr. | Pre-1990 German drawings; heritage plant maintenance | Germany, Austria, Eastern Europe | Existing legacy drawing already uses this number |
| N07080 | ASTM B637 / AMS 5667 | Bars, forgings, forging stock — nickel alloy general spec | USA, Canada, ASME global projects | Procurement document references ASTM or ASME codes |
| NiCr20TiAl | EN 10302, EN 10269 | Chemical shorthand name — not a standalone procurement designation | All regions | Informal communication only; always pair with a standard |
| Nimonic® 80A | Trade name (Special Metals) | Trade name for essentially the same alloy composition | UK, Commonwealth | UK spec or when your supplier uses the trade name |
Are the Chemistries Actually Identical?
This is the question every quality engineer on receiving inspection should ask — and it requires a precise answer.
The core NiCr20TiAl composition limits are closely aligned across EN 10269 (2.4652) and EN 10302 (2.4631). The key elements — nickel as balance (~72–76%), chromium 18–21%, titanium 1.8–2.7%, and aluminium 1.0–1.8% — are essentially the same in both standards. Minor elements such as iron (max 1.5%), carbon (0.04–0.10%), and boron (max 0.008%) are also closely matched.
While the nominal compositions are aligned, subtle differences can exist in the precise tolerance windows between standard editions. Always compare the specific standard revision on your drawing against the certificate's claimed standard — particularly for safety-critical components. Jiangsu Liangyi's technical team can provide a chemistry compliance cross-check against multiple standards from a single heat analysis on request.
Mechanical property requirements diverge slightly because EN 10269 and EN 10302 serve different application classes. In practice, however, correctly heat-treated NiCr20TiAl forgings meet the requirements of both standards simultaneously — the alloy's γ′ precipitation hardening response is consistent regardless of which standard the component is procured against.
Decision Guide: Which Designation to Specify
Follow this five-question flow to identify the right designation for your component and drawing.
What to Expect on a Mill Test Certificate
When you receive a forging from Jiangsu Liangyi, the EN 10204 3.1 Mill Test Certificate will contain the following in the material description field:
- Material designation: The specific number ordered against — e.g., "2.4631 per EN 10302:2008" or "2.4652 per EN 10269:1999"
- Alternative designation cross-reference: Common aliases (NiCr20TiAl, UNS N07080) included in the remarks field as standard practice
- Heat number: Traceable to the original melt, ESR run, and forging batch
- Chemical analysis: Reported per the governing standard; OES + wet chemistry for trace elements
- Mechanical properties: Tensile strength, proof strength, elongation, reduction in area, hardness, and Charpy impact — all reported against the minimum values in the ordered standard
When placing an order, specify the designation and the standard revision explicitly — e.g., "2.4652 per EN 10269:1999" rather than just "NiCr20TiAl." This removes ambiguity from the MTC and simplifies incoming inspection. If you need dual-standard certification (EN + ASTM B637), request this at order placement — it requires certificates prepared against both standards' test procedures.
Common Specification Mistakes to Avoid
Using Only the Chemical Name on the Drawing
Writing "NiCr20TiAl" or "Nimonic® 80A" without a standard reference leaves the supplier free to choose which standard to certify against. This creates ambiguity in audits and can make compliance demonstrations difficult. Always pair the chemical name with a Werkstoffnummer and standard: "NiCr20TiAl / 2.4631 per EN 10302:2008."
Specifying the Wrong Designation for the Component Type
Specifying 2.4652 (fastener standard) for a turbine disc, or 2.4631 (structural standard) for a stud bolt, does not usually cause a material rejection — but it creates unnecessary document review cycles. Matching the designation to the application standard is cleaner engineering practice and simplifies third-party inspection.
Updating Legacy Drawings Without an Engineering Change Note
Replacing "2.4952" with "2.4652" on a heritage drawing without formal documentation breaks the audit trail for traceability. Add a note confirming the equivalency rather than changing the number outright, unless a full document revision cycle is being performed with appropriate change control.
Assuming Different Numbers Mean Different Material
Receiving an MTC showing "2.4631" when your drawing specifies "2.4652" is not a nonconformance by itself — but it must be resolved with a documented equivalency statement before the material is accepted into stock. Jiangsu Liangyi can provide a formal written equivalency statement as part of the shipping documentation.
Does the Designation Change the Heat Treatment?
No. The two condition suffixes you will encounter on MTCs — +AT (solution annealed + aged) and +P (precipitation hardened only) — refer to the heat treatment applied to the forging, not to the material designation number. The same heat treatment produces the same γ′ microstructure and mechanical properties regardless of whether the certificate reads 2.4652 or 2.4631.
Standard NiCr20TiAl heat treatment parameters:
- Solution anneal: 1,080 °C (± 15 °C), 1–4 hours depending on section size, water or air quench
- Age hardening: 700 °C (± 10 °C), 16 hours minimum, air cool
Jiangsu Liangyi performs all heat treatment in-house under documented procedures traceable to each order and heat number.
Frequently Asked Questions
Can I use 2.4652 material for a component certified to 2.4631?
In most cases yes — because the material is chemically identical. However, if your design is governed by EN 10302 (turbine/creep applications), the supplier must certify specifically against EN 10302 mechanical property requirements, not simply produce material with the right chemistry. Request the correct standard at the time of order rather than after production is complete.
Does NiCr20TiAl meet PED (Pressure Equipment Directive) requirements?
NiCr20TiAl forgings manufactured per EN 10302 (2.4631) or EN 10269 (2.4652) fall within the material standards recognised under the PED materials framework when accompanied by EN 10204 3.1 or 3.2 mill test certificates from a qualified manufacturer. Jiangsu Liangyi holds ISO 9001:2015 certification and produces MTCs to EN 10204 3.1 standard as default. Whether a specific forging meets PED compliance for a given pressure equipment assembly depends on the equipment category and the notified body involved — please consult your PED responsible person or notified body to confirm suitability for your application.
Is Nimonic® 80A the same as 2.4652?
Nimonic® 80A is a registered trade name (Special Metals Corporation, now part of PCC Airfoils) for essentially the same NiCr20TiAl alloy. The composition is closely aligned with 2.4652 / 2.4631, though minor differences in trace element limits exist between the trade specification and the EN standards. For commercial forgings, Jiangsu Liangyi produces to EN/ASTM standards; if Nimonic® 80A specifically is required, the trade-name specification must be referenced in the order.
What is the AMS equivalent of 2.4652?
AMS 5667 covers UNS N07080 bars and forgings for aerospace applications — the same NiCr20TiAl alloy. AMS 5667 imposes additional testing and documentation requirements compared to EN 10269/EN 10302, including more stringent inclusion content controls. Please contact our team directly to confirm current capability and documentation for AMS 5667 applications before placing an order.
Need Custom 2.4652 / 2.4631 Forgings?
Tell us your required designation, dimensions, quantity, and applicable standard. Our engineering team responds within 24 hours with a detailed technical proposal and lead time estimate.
Summary: One-Minute Cheat Sheet
Use this table as a quick reference whenever you need to match a component to the right designation.
| If your component is… | Specify this number | Reference this standard |
|---|---|---|
| High-temperature bolt, stud, nut, or threaded rod | 2.4652 | EN 10269 : 1999 |
| Turbine disc, ring, valve body, structural bar | 2.4631 | EN 10302 : 2008 |
| Legacy German drawing from pre-1990 | 2.4952 | Legacy W.Nr. (add EN cross-ref note) |
| ASTM, ASME, or North American project | N07080 | ASTM B637 (or AMS 5667 for aerospace) |
Regardless of which designation your drawing carries, the underlying material — NiCr20TiAl — is one of the most field-proven precipitation-hardening nickel superalloys in industrial service, with a 60-year track record in European power generation and a cost-effective position between standard austenitic steels and complex molybdenum-bearing alloys such as Inconel® 718.
For full mechanical data, creep properties, available forging shapes, and application case studies, visit our product page: 2.4652 (NiCr20TiAl) Forged Parts — Jiangsu Liangyi.