4032 aluminum bars are a high-performance aluminum-silicon alloy (11.0%–13.0% silicon content) designed for extreme high-temperature and high-wear environments. They offer excellent piston ring compatibility, a low coefficient of thermal expansion, and superior machinability at high temperatures. Compared to standard aluminum alloys such as 6061 and 7075, 4032 is widely used in automotive pistons, aerospace components, racing engine parts, bearings, bushings, and other precision machining applications requiring extremely high thermal stability and durability.
HXM Aluminum supplies 4032 aluminum rods, bars, and round bars in various diameters and custom lengths (T6, T4, T7 specifications) in round, flat, and hexagonal shapes. We are ISO 9001 certified and provide Factory Material Testing Certificates (MTC), third-party inspection services, and global export support to help manufacturers and distributors efficiently procure reliable aluminum materials.
4032 Aluminum Bars Specifications
| Property | Standard Value | Range / Notes | Buyer Notes |
|---|---|---|---|
| Alloy | 4032 (Al-Si-Mg-Ni-Cu) | 4000 Series | Piston-grade alloy |
| Standards | ASTM B221, B211, B565 | DIN 1747, EN 573-3 | Specify standard when ordering |
| Forms | Round, flat, hex, square | Custom profiles on request | Flat bars for bearing cages |
| Round Diameter | 6 mm – 300 mm | 0.1-600 mm on request | Common: 25, 50, 75, 100 mm |
| Flat Thickness | 3 mm – 100 mm | Width: 10 mm – 400 mm | Specify width + thickness |
| Hex Width | 6 mm – 100 mm | Across flats | Across flats measurement |
| Length | 1 m – 6 m | Random, fixed, or cut-to-length | Cut tolerance: +/- 2 mm |
| Surface | Mill finish, black, polished | Drawn, extruded, or rolled | Polished for precision machining |
| Tempers | T4, T6, T7 | T6 = peak strength | T7 for high-temp stability |
| Density | 2.68 g/cm³ | – | – |
| Melting Range | 570 – 630 °C | – | Lower than 6061 |
| MOQ | 500 kg | LCL / FCL mixed OK | Stock items: 100 kg |
| Lead Time | 7-10 days (stock) | 15-25 days (custom) | Urgent: contact for availability |
| Price Range | $3,200 – $4,800 / MT | FOB China, depends on size & temper | Volume discount above 5 MT |
4032 Aluminum Bars Data Sheet
Chemical Composition of 4032 Aluminum Bars
Mechanical Properties and Tempers of 4032 Aluminium Bars
| Property | T6 Temper | T4 Temper | T7 Temper |
|---|---|---|---|
| Tensile Strength | 320 – 460 MPa | 300 – 420 MPa | 310 – 450 MPa |
| Yield Strength | 250 – 350 MPa | 220 – 340 MPa | 240 – 360 MPa |
| Elongation | ≥6% | ≥8% | ≥7% |
| Hardness | 80 – 95 HB | 70 – 90 HB | 75 – 92 HB |
For high-quality 4032 aluminum bars and professional assistance, contact HXM, your reliable supplier of aluminum products.
Physical Properties:
Density: 2.8 g/cm³
Melting point: 570 – 630°C
Thermal expansion coefficient: 2.3 × 10⁻⁵ /°C
Thermal conductivity: 150 W/m·Kc
Different Tempers of 4032 Aluminum Bars
T6 Temper
- Description: Solution heat-treated and artificially aged. Provides the highest strength and hardness of the 4032 alloy.
- Applications: Used in components requiring maximum strength and hardness, such as high-performance pistons and aerospace parts.
T4 Temper
- Description: Solution heat-treated and naturally aged. Offers good mechanical properties and machinability.
- Applications: Suitable for components where moderate strength and better machinability are needed, including various industrial applications.
T7 Temper
- Description: Solution heat-treated and artificially aged to provide additional stability and improved resistance to corrosion and high-temperature exposure.
- Applications: Ideal for high-temperature applications requiring enhanced stability and corrosion resistance.
Applications of 4032 Aluminum Bars
Automotive Pistons
High-performance pistons, piston rings, and connecting rods for racing and heavy-duty engines. Low thermal expansion prevents seizure.
T6 / T7Aerospace Components
Turbine blades, structural brackets, and heat-exposed fasteners. Excellent strength-to-weight ratio at elevated temperatures.
T6Precision Molds & Dies
High-wear injection molds, die-casting tools, and press dies where silicon provides abrasion resistance and dimensional stability.
T6Heat-Treatment Fixtures
Furnace trays, jigs, and fixtures that cycle through extreme temperatures. Low expansion reduces thermal fatigue.
T7Electronic Heat Sinks
Power-module substrates and LED heat-dissipation plates. Good thermal conductivity + machinability for complex fin profiles.
T4Bearing & Bushing Sleeves
High-load bushings and sliding bearings in compressors and pumps. Silicon content provides self-lubricating surface properties.
T6Custom Processing & Value-Added Services
Cutting & Preparation
Precision Cut-to-Length — Tolerance ±1 mm, max 6 m
Double-End Facing — Square cut, deburred edges
Chamfering — 45° or custom angle for insertion
Drilling & Tapping — H7 tolerance holes, M6–M30 threads
Machining
CNC Turning — Diameter 6–300 mm, Ra 0.8 finish
CNC Milling — Pockets, slots, keyways, profiles
Surface Grinding — Flatness 0.02 mm, parallel 0.05 mm
Wire EDM — Complex shapes, 0.1 mm wire diameter
Heat Treatment & Finishing
Solution Treatment + Aging — T4, T6, T7 custom cycles
Stress Relief — 200–250°C for machined components
Anodizing — Type II (decorative) or Type III (hardcoat)
Polishing — Mirror finish Ra 0.05 for optical molds
Inspection & Documentation
Mill Test Certificate (MTC) — EN 10204 3.1 or 3.2
Spectral Analysis — Full chemical composition report
Hardness Testing — Brinell, Rockwell, or Vickers
UT / MT Inspection — On request for critical aerospace parts
4032 Aluminum Bar Packages
The following is our company’s standard aluminum bar export packaging. If the customer has any packaging requirements, our company can meet them.
FAQ
What is 4032 aluminum bar and why is it used for pistons?
4032 is an Al-Si-Ni-Cu-Mg alloy with 11–13% silicon. The high Si content creates a hard, wear-resistant surface that reduces piston-ring groove wear. Nickel and magnesium additions improve high-temperature strength, making it ideal for engine pistons, connecting rods, and other powertrain components that operate above 150°C.
4000 Series Aluminum
4032 Aluminum Bar VS Other Aluminum Bar:
4032 vs. 6061 Aluminum Bar
Strength: 4032 offers slightly higher strength than 6061, particularly in high-temperature conditions, making it more suitable for applications like pistons or engine parts where heat resistance is important.
Wear Resistance: 4032 significantly outperforms 6061 in wear resistance, thanks to its high silicon content. This makes 4032 ideal for high-friction environments.
Thermal Expansion: 4032 has a lower thermal expansion coefficient than 6061, allowing it to maintain dimensional stability under heat, a crucial factor in automotive and aerospace components.
Corrosion Resistance: Both alloys offer good corrosion resistance, but 6061 is more versatile for general structural and marine applications.
Cost: 4032 is generally more expensive due to its specialized properties, while 6061 is more cost-effective for general engineering applications.
4032 vs. 7075 Aluminum Bar
Strength: 7075 aluminum bar is stronger than 4032 and is typically used in aerospace and other high-stress applications.
Wear Resistance: 4032 outperforms 7075 in wear resistance, as 7075 does not offer the same silicon content that gives 4032 its hardness and abrasion resistance.
Heat Resistance: 4032 excels in high-temperature environments, while 7075 is not well-suited for sustained heat exposure due to its higher thermal expansion and lower resistance to thermal stress.
Corrosion Resistance: 4032 has better corrosion resistance than 7075, particularly in environments exposed to high heat and moisture. 7075 is prone to stress corrosion cracking in certain conditions.
Cost: 7075 is more expensive than 4032 but is favored for high-strength applications. If wear resistance and thermal stability are more critical, 4032 is a better choice.
4032 vs. 2024 Aluminum Bar
Strength: Both 4032 and 2024 are high-strength alloys, but 2024 has slightly higher strength. However, 2024 is more prone to fatigue, while 4032 offers better durability in high-wear environments.
Wear Resistance: 4032 has superior wear resistance due to its silicon content, making it ideal for moving parts like pistons, whereas 2024 is more commonly used in aircraft structures where wear is less of a concern.
Heat Resistance: 4032 is better suited for high-temperature applications due to its low thermal expansion, while 2024 is more suited for low-temperature, high-strength applications.
Corrosion Resistance: 4032 has better corrosion resistance than 2024, which is more susceptible to oxidation and stress corrosion cracking.
Cost: Both alloys are expensive, but 2024 may be slightly less costly. For applications needing wear resistance and heat stability, 4032 offers better value.
4032 vs. 3003 Aluminum Bar
Strength: 4032 is significantly stronger than 3003, which is a softer, non-heat-treatable alloy used primarily for general-purpose applications like roofing and packaging.
Wear Resistance: 4032 has much better wear resistance, making it suitable for mechanical components, whereas 3003 is not designed for high-friction environments.
Heat Resistance: 4032 performs well under heat, while 3003 is not designed for high-temperature applications.
Corrosion Resistance: Both alloys offer good corrosion resistance, but 3003 is typically used for less demanding environments.
Cost: 3003 is much cheaper than 4032. However, 4032’s superior strength, wear resistance, and heat tolerance justify the higher cost for specific industrial applications.
4032 vs. 1100 Aluminum Bar
Strength: 4032 is far stronger than 1100, which is commercially pure aluminum and used in applications where strength is not a priority.
Wear Resistance: 4032’s wear resistance is much higher due to the presence of silicon, making it ideal for mechanical and automotive components. 1100 is not suitable for wear-prone environments.
Heat Resistance: 4032 handles heat exposure well, whereas 1100 has poor high-temperature stability.
Corrosion Resistance: Both alloys offer excellent corrosion resistance, but 1100 is more suited for chemical processing and electrical applications where corrosion resistance and conductivity are more important than strength.
Cost: 1100 is significantly cheaper than 4032 and is used in cost-sensitive applications like chemical equipment and electrical conductors. However, 4032 is a better choice for applications needing high wear and heat resistance.
How Can I Get A Sample Of 4032 Aluminum Bars?
Please contact us directly and send us the material, specification, quantity and delivery address of the samples you need.
Features of 4032 Aluminum Bars:
High Strength: The 4032 aluminum bar has extremely high tensile strength and hardness, suitable for applications that are subject to high stress.
Wear Resistance: The silicon content gives its surface good wear resistance, making it an ideal choice for mechanical parts.
Low Thermal Expansion Coefficient: 4032 aluminum bar has a low thermal expansion coefficient, so it has good dimensional stability in high-temperature environments.
Corrosion Resistance: The 4032 aluminum bar has excellent corrosion resistance in atmospheric and corrosive environments.
Machinability: It has good machinability and can be formed by various mechanical processing methods.
Application of 4032 Aluminum Bars:
Automotive Industry: widely used in manufacturing high-performance pistons, engine parts, etc.
Aerospace: used in manufacturing high-load mechanical parts, such as turbine blades and aviation structural parts.
Mechanical Equipment: used in high-precision mechanical parts, molds, etc. that require wear resistance and high strength.
Electronic Equipment: in the electronics field, used for parts with high heat dissipation and high stability requirements.
What is the difference between 4032-T6 and 4032-T4?
T6 is solution-treated and artificially aged, delivering peak strength (320–460 MPa UTS) and hardness (80–95 HB).
T4 is solution-treated and naturally aged, offering lower strength (300–420 MPa) but significantly better machinability and formability.
Choose T4 when you need to machine complex shapes before final aging.
Is 4032 better than 6061 for high-temperature applications?
Yes. 4032 retains strength above 200°C where 6061 begins to soften. 4032 also has lower thermal expansion and superior wear resistance due to its silicon content. However, 6061 is cheaper and has better corrosion resistance for general structural use. For pistons and heat-exposed parts, 4032 is the clear winner.
Can 4032 aluminum bars be anodized?
Yes, but the anodized layer will be darker and less uniform than on 6061 due to the high silicon content. Type II (sulfuric) anodizing is suitable for decorative and corrosion protection. Type III (hardcoat) anodizing can achieve 25–50 µm thickness for wear resistance. We recommend sealing with hot deionized water after anodizing.
What is the MOQ and lead time for 4032 bars?
Standard MOQ is 500 kg per size/temper. Stock items (common diameters 25, 50, 75 mm in T6) ship in 7–10 days. Custom diameters, profiles, or tempers require 15–25 days production time. For urgent orders, contact us to check stock availability — we can sometimes ship from existing billet inventory within 3–5 days.
Do you provide MTC and chemical analysis reports?
Absolutely. Every batch ships with a Mill Test Certificate per EN 10204 3.1 (standard) or 3.2 (third-party witness). The MTC includes: full chemical composition (spectral analysis), mechanical properties (UTS, yield, elongation, hardness), heat treatment batch number, and dimensional inspection report. SGS or BV inspection can be arranged on request.
