4032 aluminum is a heat-treatable 4xxx series alloy containing 11–13.5% silicon, giving it a low coefficient of thermal expansion and good high-temperature strength. It is the standard wrought alloy for forged pistons, connecting rods, and other components that must hold dimension under heat and load. Linsy supplies 4032 in forged billet, bar, sheet, and tube — all backed by mill test certificates.
Moduli disponibili: forged billet / bar / sheet / tube / profile
Temperamenti comuni: T6 / T651
Supporto per l'elaborazione: forging / CNC machining / heat treatment / anodizing
Documenti di qualità: Rapporto MTC allegato a ogni ordine
4032 aluminum (EN AW-4032 / UNS A94032) is a silicon-rich 4xxx series wrought alloy. Its defining feature is a low coefficient of thermal expansion combined with retained strength at elevated temperatures — properties that make it the preferred material for forged internal-combustion engine pistons.
Unlike most 4xxx series alloys that are used primarily as welding filler, 4032 is a structural wrought alloy. The high silicon content (11–13.5%) controls thermal growth, while copper, magnesium, and nickel additions build strength during the T6 heat treatment. It is supplied almost exclusively in T6 or T651 temper.
Forged billet and extruded bar are the primary forms of 4032 alloy, used for pistons, connecting rods, and precision-machined high-temperature parts. Supplied in T6 / T651 temper.
| Lega | Temperamento | Diametro (mm) | Lunghezza (mm) |
|---|---|---|---|
| 4032 | T6, T651 | 20–250 | 1,000–6,000 |
Forged piston blanks are available on request — specify your forging envelope in the RFQ.
Sheet for heat-shield panels, gaskets, and formed high-temperature components.
| Lega | Temperamento | Spessore (mm) | Larghezza (mm) | Lunghezza (mm) |
|---|---|---|---|---|
| 4032 | T6, T651 | 1.0–50 | 500–1,500 | 1,000–4,000 |
Tube and hollow bar for high-temperature structural sleeves and bushings.
| Lega | Temperamento | OD (mm) | Wall (mm) | Lunghezza (mm) |
|---|---|---|---|---|
| 4032 | T6, T651 | 20–150 | 2–15 | 1,000–6,000 |
| Standard | Denominazione |
|---|---|
| EN AW | AW-4032 |
| UNS | A94032 |
| ASTM (Forgings) | B247 |
| ASTM (Bar) | B211 |
| ISO | AlSi12CuMgNi |
Per EN 573-3 / ASTM B247:
| Elemento | Peso % |
|---|---|
| Si | 11.0–13.5 |
| Fe | 0,7 max |
| Cu | 0.50–1.3 |
| Mn | 0,50 max |
| Mg | 0.80–1.3 |
| Ni | 0.50–1.3 |
| Cr | — |
| Zn | 0,25 max |
| Ti | — |
| Altri (ciascuno) | 0,05 max |
| Altri (totale) | 0,15 max |
| Al | Equilibrio |
| Temperamento | Resistenza alla trazione (MPa) | Resistenza allo snervamento (MPa) | Elongation A50 (%) | Hardness HB |
|---|---|---|---|---|
| T6 | 310–350 | 275–295 | 9–11 | 110–130 |
| T651 | 310–350 | 270–290 | 9–11 | 110–130 |
Note: 4032 is supplied almost exclusively in T6/T651. Values are typical ranges for forged or extruded product. Confirm with mill test certificates for specific orders.
Solution heat-treated and artificially aged. T6 delivers the full strength and hardness of 4032, making it the standard temper for forged pistons and connecting rods.
Solution heat-treated, stress-relieved by stretching, then artificially aged. T651 offers the same strength as T6 with lower residual stress — preferred for thick sections and precision-machined parts where dimensional stability matters.
| Temperamento | Il migliore per | Key Advantage |
|---|---|---|
| T6 | Forged pistons, rods, high-heat parts | Maximum as-heat-treated strength |
| T651 | Precision-machined thick sections | Lower residual stress, less distortion |
The 11–13.5% silicon content gives 4032 a coefficient of thermal expansion roughly 60–70% that of common 6xxx or 7xxx alloys. This keeps piston-to-bore clearance stable across the engine’s operating temperature range — the single most important property for forged pistons.
4032 retains useful strength at temperatures where many aluminum alloys soften. It performs reliably in the 150–250°C range typical of piston crowns and turbocharger-adjacent components.
The dispersed silicon particles provide good sliding-wear resistance, helping piston skirts survive against cylinder walls without excessive scoring.
4032 has moderate corrosion resistance. The high silicon content reduces resistance to pitting and seawater exposure compared with 5xxx/6xxx alloys. In engine applications it is typically protected by oil films, coatings, or integral design — not by inherent alloy corrosion resistance.
4032 is specified wherever thermal stability and wear resistance are both required:
Every order from Linsy includes:
Linsy operates under ISO 9001, ISO 14001, and ISO 45001 management systems. Production lead times range from 10 to 60 days depending on product form and order complexity.
Linsy Aluminum supplies specialty silicon alloys to automotive, motorsport, and industrial buyers worldwide. For 4032 alloy:
Learn more about silicon alloys and forged aluminum components:
4032 is the standard wrought alloy for forged engine pistons and connecting rods. Its low thermal expansion and retained high-temperature strength keep clearances stable under heat and load. It is also used for turbocharger-adjacent parts and precision fixtures that must hold dimension during thermal cycling.
No. 4032 is a wrought (forged/extruded) alloy. Cast pistons are typically made from 3xx series casting alloys (e.g. 332, 336). 4032 is forged, not cast — this distinction matters for both properties and procurement.
No. 4032 is a base metal, not a filler alloy. The common 4xxx welding fillers are 4043 and 4045 (lower silicon) or 4145 (higher temperature). If you need to join 4032, select the filler based on service temperature and consult a welding procedure.
Both are forged piston alloys with low expansion. 2618 (Cu/Mg/Ni) offers higher temperature capability and is common in aerospace/racing; 4032 (high Si) gives better wear resistance and lower cost for high-volume performance pistons. The choice depends on temperature, load, and budget.
Anodizing is possible but produces a grey, uneven look because of the silicon content. Hard anodizing (Type III) is sometimes applied to wear surfaces; decorative bright anodizing is not typical for 4032.
MOQ depends on product form. Forged billet typically has a higher MOQ than bar. Contact Linsy for specific details.
Yes. Forged piston blanks and custom forging envelopes are available on request. Provide your forging envelope and draft in the RFQ.
Every shipment includes a Mill Test Certificate (MTC) with chemical composition and mechanical properties. SGS third-party reports are available on request.
Production lead time is 10–60 days depending on product form, dimensions, and order quantity.
Yes. Linsy supplies aluminum products to buyers worldwide. Shipping terms and freight options are confirmed during order placement.
Vantaggi Linsy
Linsy Aluminum è un fornitore leader di prodotti per la lavorazione dell'alluminio, che serve diversi settori, tra cui quello aerospaziale, dell'ingegneria generale, automobilistico, marittimo, navale e altre applicazioni industriali specializzate.
Ci impegniamo a mantenere i più alti standard di qualità e responsabilità ambientale, come dimostrano le nostre certificazioni: ISO 9001:2008, ISO 14001:2004 e SGS.
