Aluminum Alloy Material

In the field of precision manufacturing, CNC machining, with its core advantages of high precision and high flexibility, has become a core process for the production of high-end components. Aluminum alloys, as the most widely used metal material in CNC machining, rely on their core characteristics of easy cutting, lightweight, excellent cost-effectiveness, and strong surface treatment compatibility, occupying an irreplaceable position in many fields such as aerospace, automotive manufacturing, electronics, and sporting goods. Especially for products such as precision structural components and outdoor water sports equipment accessories in cross-border trade, aluminum alloy CNC machining is a key support for achieving product performance upgrades and enhancing market competitiveness.

Superior Machinability: Aluminum alloy possesses moderate hardness, and its cutting resistance is merely one-third that of steel. This allows for high-speed cutting operations; chips break easily without adhering to the cutting tool, and surface finishes can reach Ra 0.8–1.6 μm—meeting precision requirements without the need for secondary polishing.

Outstanding Lightweight Properties: With a density of just 2.7 g/cm³ (approximately one-third that of steel), it enables significant product weight reduction while simultaneously maintaining structural integrity. This makes it ideally suited for applications in aerospace, new energy vehicles, water sports equipment, and similar fields.

High Process Compatibility: Its mechanical properties can be precisely tailored through specific alloy compositions and heat treatments. Furthermore, it is compatible with a wide array of surface treatments—such as anodizing and sandblasting—thereby broadening its potential application scenarios.

Controllable Costs: The costs associated with raw materials, machining waste, and energy consumption are all lower than those of high-end metals, making it a highly cost-effective solution that meets the specific requirements of both mass production and cross-border trade.

Features: Moderate strength (tensile strength of approximately 240 MPa) combined with excellent toughness; exhibits outstanding resistance to atmospheric corrosion. It is highly amenable to CNC machining processes—such as turning, milling, and drilling—offering smooth cutting performance with minimal tool adhesion. It maintains high dimensional stability after processing and is easily anodized; the resulting oxide layer is uniform, durable, and capable of displaying a wide spectrum of colors to meet diverse aesthetic requirements.

Applications: Widely utilized for various equipment enclosures, structural mechanical components, brackets, cover plates, and general-purpose connectors. It stands as the most cost-effective and widely used aluminum alloy grade in CNC machining applications, commonly found in fields such as automation equipment, electronic devices, and medical instrumentation.

Features: Possesses excellent plasticity and is easily extruded into various cross-sectional profiles. It features high surface flatness and a fine finish; after anodizing, the surface appears delicate, uniform, and rich in color, offering outstanding aesthetic appeal. Furthermore, it presents low processing difficulty—resisting burr formation during CNC machining—making it highly suitable for the fabrication of high-precision cosmetic components.

Applications: Primarily utilized for aluminum alloy profiles, equipment frames, decorative panels, ornamental trim, heat sink profiles, and similar items. It is commonly found in applications with stringent requirements for both aesthetics and formability—such as door and window frames, electronic device bezels, display racks, and thermal management structures.

Features: A medium-to-high-strength aluminum alloy belonging to the 6-series family, featuring a tensile strength of approximately 310 MPa—making it stronger than 6061 alloy. It exhibits excellent extrudability, allowing it to be processed into thick-walled profiles and large-scale structural components. It offers good weldability and corrosion resistance, yields consistent results during anodizing, and demonstrates smooth cutting performance and high stability during CNC machining, making it ideal for high-precision batch processing.

Applications: Suitable for heavy-duty mechanical structural components, robotic arms, equipment frames, mold base plates, load-bearing parts in automation equipment, and similar applications—particularly well-suited for large-scale CNC-machined parts that demand high levels of strength and dimensional stability.

Features: A high-strength grade within the 6-series aluminum alloys, featuring a tensile strength of approximately 340 MPa. It offers a well-balanced combination of machinability, anodizing response, and weldability, with no significant weaknesses. Post-processing, it exhibits high dimensional accuracy and minimal deformation, making it ideal for the precision CNC machining of complex structures.

Applications: Primarily utilized for precision mechanical structural components, tooling and fixtures, precision parts for automation equipment, instrument housings, and similar items. It is well-suited for applications where high demands are placed on both machining precision and overall performance.

Features: Classified as an ultra-high-strength aluminum alloy, this material boasts a tensile strength exceeding 570 MPa. It features high hardness, excellent wear resistance, and robust fatigue resistance, making it suitable for applications involving heavy loads. However, it presents a slightly higher degree of difficulty during CNC machining; cutting operations require the use of carbide tools, and feed rates should be kept moderate to prevent accelerated tool wear.

Applications: Widely utilized in aerospace components, high-load structural parts, gears, shafts, mold plates, and core components for high-end equipment. It is ideally suited for precision CNC machining scenarios where exceptionally high strength requirements are paramount.

Features: A 7-series ultra-high-strength aluminum alloy with a tensile strength of approximately 540 MPa. While its strength rivals that of 7075 alloy, it offers superior toughness and resistance to stress corrosion cracking, and is less prone to developing processing cracks. Due to the material's relative hardness during CNC machining, it requires the use of machine tools with high rigidity and sharp cutting tools; cutting parameters must be carefully controlled to ensure machining precision.

Applications: Suitable for aerospace structural components, drone airframes and core assemblies, high-end precision equipment load-bearing parts, and other applications where high demands are placed on strength, toughness, and corrosion resistance.

Features: Exhibits excellent rust resistance—particularly against seawater corrosion—and superior formability, allowing for cold working processes such as bending and stamping. It retains substantial strength (with a tensile strength of approximately 190 MPa) even without heat treatment. It offers excellent weldability, is easy to machine via CNC with smooth cutting characteristics, and is well-suited for fabricating complex bent structures.

Applications: Primarily utilized for bent sheet metal components, fuel tanks, piping, mechanical parts operating in humid environments, and marine equipment accessories. It is commonly found in industries such as chemical processing, shipbuilding, and outdoor equipment manufacturing.

Features: A 5-series high-magnesium aluminum alloy, it exhibits exceptional rust resistance and resistance to seawater corrosion—far surpassing that of the 5052 alloy. While it cannot be strengthened via heat treatment, its strength can be significantly enhanced through cold working (achieving a tensile strength of approximately 300 MPa after cold processing). During CNC machining, the material tends to be relatively soft and prone to tool adhesion; therefore, careful attention must be paid to chip evacuation during cutting to prevent the formation of built-up edges.

Applications: Suitable for use in marine components, enclosures and piping for refrigeration equipment, pressure vessels, large-scale outdoor structural elements, and offshore engineering equipment. It is an ideal choice for CNC-machined parts intended for long-term service in humid or corrosive environments.

Features: Composed of high-strength aerospace-grade hard aluminum, it possesses a tensile strength of approximately 470 MPa and exhibits excellent heat resistance, maintaining stable performance even in high-temperature environments. However, its corrosion resistance is moderate; it is prone to oxidation when exposed to humid environments for extended periods, and therefore typically requires surface treatments such as anodizing or painting. The material presents a moderate level of difficulty for CNC machining, necessitating the careful selection of cutting parameters.

Applications: Primarily utilized for aerospace structural components, high-load precision parts, mechanical components operating in high-temperature environments, and mold inserts. It is commonly found in high-end sectors such as the aviation and defense industries.

Features: A classic 2-series hard aluminum alloy with a tensile strength of approximately 370 MPa. While its strength is slightly lower than that of 2024, it offers superior CNC machinability, allowing for smooth cutting operations and minimal tool wear. It is also more cost-effective than 2024, offering excellent overall value; furthermore, it is suitable for welding and simple surface treatments.

Applications: Ideal for components such as shafts, gears, fixtures, precision load-bearing parts, and mechanical transmission components. It is well-suited for applications where specific requirements exist regarding both strength and machinability, and where cost-effectiveness is a priority.

Features: This is the most widely used 2-series hard aluminum alloy in China, boasting a tensile strength of approximately 420 MPa. It offers high strength and excellent rigidity, making it well-suited for applications involving heavy loads. However, its machinability is moderate; due to its inherent hardness, tool wear during CNC machining is significantly greater than that encountered with 6-series aluminum alloys. Consequently, the use of wear-resistant cutting tools and careful control of cutting speeds are required.

Applications: It is suitable for use in aerospace structural components, mold inserts, load-bearing brackets, heavy-duty mechanical parts, and similar applications. Serving as a common domestic substitute for the 2024 alloy, it is widely utilized across sectors such as aerospace and mechanical manufacturing.

Features: A 1-series pure aluminum alloy with a purity exceeding 99.5%. The material is extremely soft (with a tensile strength of approximately 95 MPa) and exhibits excellent thermal and electrical conductivity—ranking among the best of all aluminum alloys in terms of thermal performance. During CNC machining, the material's excessive softness makes it prone to tool adhesion and surface scratching; therefore, the use of sharp cutting tools and reduced feed rates is required.

Applications: Primarily used for heat sinks, conductive components, decorative sheet metal, simple enclosures, and housings for electronic components. It is ideally suited for applications where exceptional thermal and electrical conductivity are paramount, while strength requirements are relatively low.

Features: A 3-series manganese-aluminum alloy, it exhibits excellent corrosion resistance and superior formability, allowing for cold working processes such as bending and stamping. Its strength exceeds that of 1-series pure aluminum (with a tensile strength of approximately 150 MPa); however, it cannot be strengthened through heat treatment. It possesses excellent weldability. During CNC machining, the material is relatively soft, allowing for easy cutting with minimal burr formation.

Applications: Suitable for equipment enclosures, decorative panels, piping, general-purpose light-load components, and small structural parts. It is the preferred alloy grade for low-cost, light-load applications and is commonly found in sectors involving daily consumer goods and small-scale equipment.

Following the principles of "performance matching, processing feasibility, and optimal cost," the core selection criteria are as follows:

- Best overall cost-effectiveness: 6061-T6 (covering 80% of general applications);

- Ultra-high strength requirements: 7075-T6 (7075-T73 for corrosion resistance);

- Corrosive environments: 5083 preferred, followed by 5052;

- Sheet metal/bending parts: 5052; Profiles/decorative parts: 6063;

- Heavy-duty structures: 6082-T6; Mass-produced die-cast housings: ADC12 (A380);

- High-stress aerospace components: 2024 (fatigue-resistant) or 7075-T6 (high strength).

After CNC machining, surface treatment of aluminum alloy parts not only improves their weather resistance and lifespan but also optimizes their appearance, precisely meeting the aesthetic demands of the cross-border market. We offer diverse and personalized surface treatment options for different application scenarios, as follows:

1. Anodizing: The most commonly used surface treatment process, divided into hard anodizing and colored anodizing. Hard anodizing films can reach a thickness of 10–50 μm, offering excellent wear and corrosion resistance, suitable for industrial parts; colored anodizing allows for a variety of custom colors, adapting to the aesthetic requirements of consumer electronics and sporting goods.

2. Sandblasting/Brushing: Through physical polishing processes, a delicate matte texture is achieved on the surface of parts, effectively concealing minor tool marks and enhancing the product's feel and premium look. Widely used in electronic casings, decorative parts, and other products.

3. Spray Coating/Electrophoresis: Allows for rich color and pattern customization, possesses excellent corrosion resistance, and provides a uniform surface texture, suitable for consumer products with high aesthetic requirements, enhancing product market competitiveness.

4. Passivation/Chemical Oxidation: Forms a thin and uniform protective film on the surface of the part without affecting the dimensional accuracy and conductivity of the part. It is suitable for precision electronic connectors, conductive components and other products with strict requirements for size and conductivity.

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