Overview
A4032 (AA 4032 / UNS A94032 / EN AW-4032, AlSi12CuNiMg) is the industry-standard forged piston aluminum alloy. Its ~12% silicon content gives low thermal expansion, outstanding ring-groove wear resistance and stable strength at 250–300°C — the reason virtually all high-performance and turbocharged forged pistons are made from 4032-T6. Shanghai Vertex Alloy Co., Ltd (Vertex Alloy) supplies 4032-T6 round bars from 8 to 250 mm to ASTM B211 with EN 10204 3.1 certificates, plus forging blanks and finished piston components machined per drawing. Forged 4032 delivers finer grain, higher fatigue life and tighter clearances than cast piston alloys. Contact Shanghai Vertex Alloy Co., Ltd for latest stock, sizes and pricing.
Description (English)
Shanghai Vertex Alloy Co., Ltd (Vertex Alloy) supplies A4032 aluminum alloy round bar (AA 4032 / UNS A94032 / EN AW-4032 AlSi12CuNiMg, similar to Chinese GB 4A11). 4032 is the classic forged piston alloy: 11.0–13.5% silicon delivers low thermal expansion, excellent wear resistance and stable strength at 250–300°C, making it the standard choice for high-performance and turbocharged engine pistons, racing motorcycle pistons and air-conditioning compressor swash plates. Supplied in T6 temper, Ø 8–250 mm, to ASTM B211 with EN 10204 3.1 certificates. Forged blanks and finished machined piston parts per drawing are also available. Contact us for the latest stock and pricing.
Size Range
- Diameter Range:8–250 mm
- Length:1,000–6,000 mm or cut-to-length available
Grade Specification
| System | Value |
|---|---|
| USA (AA) | 4032 / A4032 |
| 🇺🇸 UNS | A94032 |
| Europe (EN) | EN AW-4032 / AlSi12CuNiMg |
| China (GB) | 4A11 (LD11) |
| Typical Spec | ASTM B211 / B221 |
Chemical Composition
| Element | Value |
|---|---|
| Si | 11.0–13.5 |
| Cu | 0.50–1.3 |
| Mg | 0.50–1.3 |
| Ni | 0.50–1.3 |
| Fe | ≤ 1.0 |
| Mn | ≤ 0.20 |
| Cr | ≤ 0.10 |
| Zn | ≤ 0.25 |
| Ti | ≤ 0.25 |
| Al | Balance |
Mechanical Properties
| productCenter.property | Value |
|---|---|
| Tensile Strength | ≥ 380 MPa |
| Yield Strength | ≥ 290 MPa |
| Elongation | ≥ 5% |
| Hardness | ≈ 120 HB |
| Fatigue Strength | ≈ 110 MPa (5×10⁸ cycles) |
| Forging Temperature | 410–470°C |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Item Value Density | g/cm³ | 2.70 g/cm³ |
| Melting Range | °C | 570–580°C |
| Thermal Conductivity | W/m·K | 155 W/(m·K) |
| CTE (20–100°C) | - | 19.4 × 10⁻⁶ /K |
| Specific Heat | J/kg·K | 960 J/(kg·K) |
| Elastic Modulus | GPa | 79 GPa |
| Electrical Conductivity | - | ≈ 38% IACS |
Applications
- Automotive：Forged high-performance pistons
- Automotive：Turbocharged engine pistons
- Motorcycle：Racing pistons
- Motorcycle:Two-stroke pistons
- Compressors:AC compressor swash plates
- Compressors:Compressor pistons
- Marine:Outboard engine pistons
- Power Sports:Snowmobile / ATV pistons
- General:Hot-work components
- General:Bearing sleeves