2618 aluminum alloy (AlCu2Mg1.5Ni) is a heat-treatable 2000 series wrought aluminum alloy alloyed primarily with copper, magnesium, and nickel. It is specifically engineered for applications requiring high strength retention at elevated temperatures — a characteristic driven by its unique Ni-Fe intermetallic dispersion hardening. Known widely as the piston alloy, 2618 offers excellent forgeability, good machinability, and reliable mechanical stability up to approximately 250 °C (480 °F). Linsy supplies 2618 aluminum sheet, plate, bar, tube, forging stock, and wire in tempers O, T6, T61, and T6511, with custom sizes, processing support, and MTC reports available.
Available forms: sheet / plate / bar / tube / forging stock / wire
Common tempers: O / T6 / T61 / T6511
Processing support: CNC machining / forging / cutting / surface finishing
Quality documents: MTC report with every order, SGS test reports available on request
2618 aluminum alloy (UNS A92618) is a heat-treatable 2000 series wrought aluminum alloy designed specifically for elevated-temperature service. Its composition is distinguished by the deliberate addition of nickel (Ni) and a higher iron (Fe) content — together forming stable Ni-Fe intermetallic compounds (Al₉FeNi) that resist coarsening at high temperatures. This dispersion hardening mechanism is what sets 2618 apart from other 2xxx alloys such as 2014 and 2024.
The primary alloying elements are copper (1.9–2.7%), magnesium (1.3–1.8%), and nickel (0.9–1.2%), with iron (0.9–1.3%) contributing to the high-temperature strengthening phase. In the T61 temper (solution heat-treated and artificially aged), 2618 maintains useful mechanical strength at service temperatures where conventional aluminum alloys would rapidly soften — making it the material of choice for aerospace pistons, high-speed compressor rotors, plastic injection molds, and forged automotive connecting rods.
2618 is typically shaped by hot forging, but is also available as extruded bar, rolled plate, and drawn tube. Its high-temperature stability comes with trade-offs: it has only fair corrosion resistance (below 5xxx and 6xxx series levels), is difficult to weld by conventional fusion methods due to hot-cracking sensitivity, and should be evaluated carefully for applications requiring anodized surface finishes. The alloy is covered under AMS 4132 and ASTM B247 (forging stock and forgings), with additional coverage under EN 573-3 / EN 4613 for European procurement.
Linsy supplies 2618 aluminum alloy in a range of standard and custom product forms. Length, width, diameter, and dimensional tolerances can be tailored to your project requirements.
| Form | Temper | Kalınlık (mm) | Genişlik (mm) | Uzunluk (mm) |
|---|---|---|---|---|
| 2618 Sheet / Coil | O, T4, T61, T651 | 0.3 – 6.0 | 500 – 2600 | 500 – 16000 |
| Form | Temper | Kalınlık (mm) | Genişlik (mm) | Uzunluk (mm) |
|---|---|---|---|---|
| 2618 Plate | O, T61, T651 | 6.0 – 200 | 500 – 2600 | 500 – 12000 |
| Form | Temper | Çap (mm) | Uzunluk (mm) |
|---|---|---|---|
| 2618 Bar (Round) | T6, T61, T6511 | 10 – 500 | 1000 – 6000 |
| Form | Temper | OD (mm) | ID (mm) | Uzunluk (mm) |
|---|---|---|---|---|
| 2618 Tube | T6, T61, T6511 | 10 – 500 | 5 – 450 | 1000 – 6000 |
| Form | Temper | Çap (mm) | Uzunluk (mm) |
|---|---|---|---|
| 2618 Forging Stock | O, T61 | 20 – 600 | 500 – 6000 |
| Form | Temper | Çap (mm) | Weight / Coil |
|---|---|---|---|
| 2618 Wire | T61, T6511 | 0.8 – 30 | Min 50 kg |
Length, width, diameter, and dimensional tolerances can be customized. Contact us with your drawing or specification for 2618 aluminum profiles, custom forging preforms, or engineered plates with tight compositional controls.
| Element | Composition (wt%) |
|---|---|
| Bakır (Cu) | 1.9 – 2.7 |
| Magnezyum (Mg) | 1.3 – 1.8 |
| Nikel (Ni) | 0.9 – 1.2 |
| Demir (Fe) | 0.9 – 1.3 |
| Silisyum (Si) | 0.10 – 0.25 |
| Titanyum (Ti) | 0.04 – 0.10 |
| Manganez (Mn) | 0,15 Maks |
| Krom (Cr) | 0,10 Maks |
| Çinko (Zn) | 0,15 Maks |
| Others, Each | 0,05 Maks |
| Others, Total | 0,15 Maks |
| Alüminyum (Al) | Denge |
Values below are typical for 2618 aluminum in common tempers. Actual properties depend on product form, section thickness, and processing history. Contact Linsy for specification-grade data for your specific order.
| Mülkiyet | Tipik Değer |
|---|---|
| Çekme Dayanımı, Nihai | ~200 MPa |
| Tensile Strength, Yield (0.2% offset) | ~100 MPa |
| Uzama | ~14% |
| Sertlik (HB) | ~55 |
| Mülkiyet | Tipik Değer |
|---|---|
| Çekme Dayanımı, Nihai | ≥ 400 MPa |
| Tensile Strength, Yield (0.2% offset) | ≥ 310 MPa |
| Uzama | ~8% |
| Sertlik (HB) | ~115 |
| Mülkiyet | Tipik Değer |
|---|---|
| Çekme Dayanımı, Nihai | ≥ 400 MPa |
| Tensile Strength, Yield (0.2% offset) | ≥ 310 MPa |
| Uzama | ~8% |
| Sertlik (HB) | ~115 |
| Temper | İçin En İyisi | Tipik Uygulamalar |
|---|---|---|
| 2618-O | Starting condition for forging, re-machining before heat treatment, or applications where maximum ductility is needed. | Forging blanks, forming operations, machining stock prior to precipitation hardening |
| 2618-T61 | Forged parts requiring peak high-temperature strength. Solution heat-treated and artificially aged at an elevated temperature compared to standard T6. | Aerospace pistons, compressor rotors, high-temperature structural forgings, plastic injection molds |
| 2618-T6511 | Extruded bars and tubes requiring peak strength with stress relief for dimensional stability during machining. | Precision-machined components, automotive connecting rods, engine components requiring tight tolerances |
| Standart | Designation |
|---|---|
| UNS | A92618 |
| EN / European | EN AW-2618 / AlCu2Mg1.5Ni |
| AMS (Aerospace Material Specification) | AMS 4132 (forgings) |
| ASTM | ASTM B247 (forging stock and forgings) |
| EN Standard for Forgings | EN 4613 |
The defining characteristic of 2618 aluminum is its ability to retain mechanical strength at temperatures up to approximately 250 °C (480 °F). Unlike standard age-hardening aluminum alloys that rapidly over-age and lose strength above 150 °C, the Ni-Fe intermetallic dispersion in 2618 resists coarsening under thermal cycling — making 2618 the alloy of choice for pistons, compressor rotors, and other heat-exposed aerospace and automotive components.
2618 was designed for hot forging and delivers excellent forgeability in the solution-annealed (O-temper) condition. Post-forging, 2618 reaches its full strength through solution heat treatment followed by artificial aging (T61 temper). In the T6/T61 condition, 2618 offers good machinability comparable to other 2xxx series alloys — producing well-broken chips with carbide tooling under standard machining parameters.
As with most 2000 series aluminum alloys, 2618 has limited weldability. The high copper content makes it susceptible to hot cracking and solidification defects during fusion welding (TIG, MIG). Arc welding is generally not recommended for structural applications. Friction stir welding may be viable in controlled production environments. For most assembly applications, mechanical fastening or press-fit integration is the preferred joining method.
2618 aluminum has only fair corrosion resistance — below that of 5xxx and 6xxx series alloys — due to its high copper content. It is not recommended for marine or chemical exposure environments without protective coatings. When corrosion protection is required, hard anodizing or conversion coating should be evaluated, though anodizing response is moderate due to the alloy’s intermetallic phases.
| Endüstri | Tipik Uygulamalar | Why 2618 Is Used |
|---|---|---|
| Havacılık ve Uzay | Engine pistons, compressor impellers, turbine blades, high-temperature structural brackets, helicopter rotor components | Maintains strength after prolonged exposure to operating temperatures up to 250 °C; AMS 4132 qualified for aerospace forging. |
| Automotive & Motorsport | High-performance pistons, connecting rods, turbocharger compressor wheels, cylinder heads for racing engines | Excellent strength-to-weight ratio under thermal cycling; widely used in Formula 1, WRC, and other performance engines. |
| Plastik Kalıplama | Injection mold cores and cavities, blow mold tooling, thermoforming tools | High thermal conductivity with good elevated-temperature strength; faster cycle times compared to steel tooling. |
| Oil & Gas / Power Generation | Compressor components, high-speed rotating parts, high-temperature seals | Reliable performance under sustained elevated temperatures without creep-induced dimensional changes. |
| General Industrial Engineering | High-temperature jigs and fixtures, heat exchanger components, furnace parts | Cost-effective aluminum alternative to titanium where operating temperature is below 250 °C. |
| Süreç | Suitability | Notlar |
|---|---|---|
| CNC Machining | İyi | Performs well with carbide tooling. Recommend positive rake angles and adequate coolant delivery. T6511 temper provides best dimensional stability for precision machining. |
| Hot Forging | Mükemmel | This is the primary shaping method for 2618. Forge at 380–450 °C. Solution treatment and aging follow forging to achieve T61 temper properties. |
| Welding (Arc / Fusion) | Not Recommended | High copper content causes hot cracking sensitivity. Structural welds should be avoided. Friction stir welding may be assessed on a case-by-case basis. |
| Eloksal | Orta düzeyde | Intermetallic phases (Ni-Fe particles) can cause uneven oxide layer formation. Hard anodizing is possible but may produce a darker, less-uniform appearance than 6061 anodizing. |
| Polishing | İyi | Mechanical polishing achievable. Surface finish can be maintained in non-corrosive environments with appropriate protective coating. |
Every 2618 aluminum order from Linsy includes a Mill Test Certificate (MTC) documenting chemical composition and mechanical properties for your specific batch. Additional documentation and testing services are available on request:
| Mülkiyet | 2618 | 2024 |
|---|---|---|
| Birincil Alaşım Elementleri | Cu + Mg + Ni + Fe | Cu + Mg + Mn |
| High-Temp Strength | Excellent (retains strength up to ~250 °C) | Limited (softens significantly above ~150 °C) |
| Room-Temp Strength (T6) | ~400–440 MPa UTS | ~470 MPa UTS |
| Forgeability | Mükemmel | İyi |
| Korozyon Direnci | Fair (similar to 2024) | Fair; often Alclad for protection |
| Kaynaklanabilirlik | Not recommended | Not recommended |
| Tipik Kullanım | Pistons, compressor rotors, molds — hot applications | Aircraft structures, fuselage skins, fittings — ambient/high-strength applications |
For a more detailed comparison covering mechanical properties, cost, and availability across product forms, read our 2618 alloy guide.
Linsy Aluminum is a Shenzhen-based aluminum factory with more than 20 years of industry experience, specializing in a full range of aluminum alloys across the 1000–8000 series. We supply 2618 aluminum in multiple product forms — sheet, plate, bar, tube, forging stock, and wire — with standard and custom sizes to match project specifications.
What sets Linsy apart for 2618 aluminum procurement:
Contact us with your 2618 aluminum specification or drawing for a quote — our engineering team provides same-business-day response for standard inquiries.
2618 aluminum is primarily used for components that require high strength at elevated temperatures. Its most common applications include aerospace engine pistons, compressor rotors, automotive high-performance pistons and connecting rods, plastic injection mold tooling, and high-temperature jigs and fixtures. The alloy is specifically designed to maintain mechanical properties at service temperatures up to approximately 250 °C (480 °F).
The key difference lies in high-temperature performance. 2618 contains nickel and higher iron to form stable Ni-Fe intermetallic compounds that resist thermal softening — giving 2618 excellent strength retention up to ~250 °C. 2024, while slightly stronger at room temperature (~470 MPa vs ~440 MPa UTS), loses strength significantly above ~150 °C. 2618 is preferred for hot applications (forged pistons, compressor parts); 2024 is preferred for ambient-temperature structural applications (aircraft skins, fittings).
Linsy supplies 2618 aluminum in O (annealed — for forging blanks and machining before heat treatment), T61 (solution heat-treated and artificially aged — the standard temper for forged aerospace parts), and T6511 (solution heat-treated, stress-relieved, and artificially aged — preferred for extruded bar and tube requiring dimensional stability during machining). Contact us for availability of additional tempers or custom heat treatment specifications.
Arc welding (TIG, MIG) of 2618 aluminum is generally not recommended for structural applications. The high copper content creates a susceptibility to hot cracking and solidification defects in the weld zone. If joining is required, mechanical fastening or press-fit integration is the preferred method. Friction stir welding may be feasible in controlled production environments and should be evaluated on a case-by-case basis.
2618 aluminum retains useful mechanical properties at temperatures up to approximately 250 °C (480 °F). This is significantly higher than standard precipitation-hardened alloys such as 6061-T6 (~150 °C practical limit) or 2024-T3 (~120 °C). However, sustained exposure above 250 °C will eventually lead to microstructural coarsening and progressive strength loss. For the best combination of performance and service life, consult with Linsy’s engineering team on your specific operating temperature profile.
2618 has only fair corrosion resistance due to its high copper content. In corrosive or outdoor environments, protective surface treatment is recommended. Hard anodizing can provide a protective oxide layer, though the finish will typically be darker and less uniform than anodized 6061 due to 2618’s intermetallic constituents. For non-aesthetic applications, chemical conversion coating (chromate or non-chromate) may offer sufficient protection. In non-corrosive indoor or lubricated environments (e.g., engine internals), uncoated 2618 is commonly used.
Yes. Linsy supplies 2618 aluminum forging stock in the O-temper condition, typically in bar or billet form with diameters from 20 mm to 600 mm. Forging stock can be cut to your specified length and supplied with MTC documentation. Contact us with your forging preform dimensions and target temper specification for a quote.
Standard 2618 aluminum specifications in stock can ship within days. For custom sizes, non-standard tempers, or specially machined parts, the typical lead time is 10–60 days depending on the alloy, dimensions, processing requirements, and order complexity. Linsy supports low-MOQ custom production for non-stock items, so you can order exactly what your project requires without excessive minimum quantities.
Every 2618 aluminum order from Linsy includes a Mill Test Certificate (MTC) that documents the chemical composition and mechanical properties of your specific production lot. Additional documentation available on request includes SGS test reports (chemical composition, mechanical properties, ultrasonic inspection for thick plate and forging stock, RoHS/REACH compliance, and dimensional verification reports).
Yes. AlCu2Mg1.5Ni is the European designation for 2618 aluminum alloy under the EN 573-3 naming convention. The designation refers to its primary alloying elements: aluminum-copper-magnesium-nickel. The UNS equivalent is A92618, and the alloy is also specified under AMS 4132 (forgings) and ASTM B247. All nomenclature refers to the same material.
Linsy supports both large-volume and low-MOQ orders. Standard specifications can be ordered in small quantities from stock. For custom specifications, we offer low-MOQ production to support project-based needs and prototyping. Contact us with your specification to confirm availability and minimum quantities for your specific 2618 aluminum requirements.
Yes, samples are available for evaluation. Standard sample dimensions are provided free of charge; customer covers freight cost for shipping from our Shenzhen facility. Custom-dimension samples may involve a nominal preparation fee. Contact our team with your sample requirements.
We accept T/T (wire transfer) and L/C (Letter of Credit). Standard payment terms are discussed during quotation. For new customer relationships, we offer flexible terms to help establish long-term supply partnerships.
Linsy exports aluminum products to markets across Europe, North America, South Africa, Brazil, Singapore, Turkey, Japan, South Korea, and other regions. We arrange international freight with major carriers and can accommodate CIF, FOB, and EXW delivery terms based on your preference.
Send your specification — alloy, temper, product form, dimensions, and quantity — via our contact form or email. Our engineering team typically responds within one business day with pricing, availability, and lead time information.
Linsy Avantajları
Linsy Alüminyum, havacılık, genel mühendislik, otomotiv, denizcilik, gemi yapımı ve diğer özel endüstriyel uygulamalar dahil olmak üzere çeşitli endüstrilere hizmet veren lider bir alüminyum işleme ürünleri tedarikçisidir.
Sertifikalarımızın da gösterdiği gibi, en yüksek kalite ve çevresel sorumluluk standartlarını sürdürmeye kararlıyız: ISO 9001:2008 ， ISO 14001:2004 ve SGS.
