Introduction to Aluminum

Aluminum is the third most found element on the earth and the second most famous manufacturing material after steel. It is silver-white colored metal with a face-centered cubic crystal shape. Aluminum features a low density of about 2.70g/cm3, 660oC melting point, and 2327oC boiling point. Aluminium’s outstanding machinability and weldability make it ideal for CNC milling, turning, boring, and other machining processes. In addition, due to its high strength-to-weight ratio, lightweight, heat resistance, excellent electricity conductance, and good corrosion resistance properties, manufacturers widely use it for producing different durable parts. Most commonly, aluminum is used to manufacture rods, foils, flakes, filaments, strips, pipes, and more.
Aluminum Materials -

Classification of Aluminum

Aluminum alloys are typically classified based on the proportion of alloying elements such as magnesium, copper, zinc, silicon, tin, and nickel. However, the two significant types of aluminum alloys are wrought and cast aluminum alloys, further subdivided as heat-treatable and non-heat-treatable alloys. Usually, the wrought alloys exist as 1XXX to 8XXX series, while cast alloys are represented as 1xx.x to 9xx.x series. The following is the classification chart of aluminum.

Classification of Aluminum & Aluminum Alloy -

Advantages of Aluminum

Disadvantages of Aluminum

Despite the remarkable benefits of aluminum, there are also some shortcomings.
● Pure aluminum is quite soft and can’t offer good strength. It’s necessary to add alloying elements to enhance aluminum’s strength.
● Furthermore, the surface of aluminum or aluminum alloys is sensitive to surface defects such as scratches. Thus, careful production operation and improved management are required to avoid surface defects.

Surface Treatment For Aluminum Parts

Once the aluminum part is produced, it may undergo several surface treatment processes to enhance its properties and make it more corrosion-resistant. The following are some suitable finishing processes for aluminum parts that improve both aesthetics and properties of the particular component.

Surface Treatment
Typical Product


Anodizing -

Anodizing improves corrosion resistance, enhancing wear and hardness and protecting the metal surface. This surface finish is widely used in mechanical parts, aircraft, automobile parts, and precision instruments.

Clear, Black, Grey, Red, Blue, Gold, White, Silver, Purple

Smooth, Matte finish

Bead Blasting

Bead Blasting -

Bead blasting results in parts with a smooth surface with a matte texture. It is used mainly for visual applications and can be followed by other surface treatments.


Smooth, Matte finish

Powder Coating

Powder Coating -

Powder coating is a type of coating that is applied as a free-flowing, dry powder. Unlike conventional liquid paint, which is delivered via an evaporating solvent, powder coating is typically applied electrostatically and then cured under heat or with ultraviolet light.

Black, Grey, White, Yellow, Red, Blue, Green, Gold, Vertical stripe

Smooth, Matte finish


Electroplating -

Electroplating can be functional, decorative, or corrosion-related. Many industries use the process, including the automotive sector, where chrome-plating of steel automobile parts is common.

Clear, White, Black, Grey, Red, Yellow, Blue, Green, Gold, Silver, Bronze

Smooth, Semi-matte, Matte finish


Polishing -

Polishing is the process of creating a smooth and shiny surface, either through physical rubbing of the part or by chemical interference. This process produces a surface with significant specular reflection, but it can reduce diffuse reflection in some materials.


Smooth, Matte finish


Anodizing (2)

Brushing is a surface treatment process in which abrasive belts are used to draw traces on the surface of a material, usually for aesthetic purposes.


Smooth, Matte finish

Manufacturing Technology Products
Stamping & Profile machining Automotive: Instrument cabin, Private cabin, Aft cabin, Fuel tank, Frame, Shell, Skin, Helicopter shaped hollow rotor girders and airstrips
Bumper anti-collision beam, energy absorption box, car door anti-collision beam, car dashboard support frame, car chassis parts, car body parts, oil pipeline, slide rail, luggage rack, heat exchanger, canopy rod, battery aluminum tray, power battery housing, cover plate
Forging Landing gear,frame,moving ring,stationary ring,wing SPAR,hub,bumper,base girder,swing arm,disc brake claw,slide block,connecting rod,cylinder,piston skirt,cannonball rack,tank road wheels,armored vehicles,rockets,warships,mold,flanges,fuel rack
Die Casting Aircraft parts, instrument accessories, engine and accessory parts, fuel pump housing, pump cover, mounting seat, flight landing gear, engine housing, flap, Aircraft cabin housing,
Piston, oil pressure components, low temperature fuel tank, transmission, instrument housing, supercharger pump body, hub, hanger, intake lip, diesel locomotive parts, clutch housing, rear axle housing, steering gear housing, oil pump, water pump, brake clamp, engine housing, exhaust system, transmission housing, steering wheel, engine fittings, cylinder head, cylinder block, rocker arm cover, valve support,
Transmission device housing, pump housing, instrument housing, carburetor, crankcase, slide block, crankshaft, carburetor parts, electrical equipment housing, rotor engine cylinder block, cylinder head, water pump impeller and large housing, oil pump housing, support, flywheel cover, precision instrument parts, motor end cover,
Bracket, lamp shell, door lock shell, camera shell, household appliances accessories, supplies, crafts,
Loudspeaker, amplifier, radio, mobile phone case, security product case, camera case, TV stand, computer case,
Turbine blades, pump bodies, instrument housings, machine covers, covers, Marine portholes, Marine accessories, various housings, air-cooled engine cylinder heads and other decorative parts,
Gravity Casting Engine cylinder block, cylinder head, carburetor housing, gear pump, hub, chassis, brake pedal
Micro motor holder, mobile phone case, computer case, radiator, optical drive holder, TV terminal box
Electric drill shell, motor rotor, protective cover, head,
Pots, mechanical connectors, elevators, decorations

Application of Aluminum

Aluminum is considered a top material choice for manufacturing industries due to its exceptional characteristics. Manufacturers usually prefer aluminum due to its versatility, as it’s compatible with several manufacturing processes, including CNC machining, forging, stamping, and casting. The widespread applications of aluminum can be found in our daily use components to heavy machinery and vehicles.

Parameter Definition Value Parameter Definition Value
Density Density is a physical property of a material that describes the amount of mass per unit volume of that material. It is defined as the mass of a substance divided by its volume. 2.7g/cm3 Impact Toughness Impact toughness measures a material’s ability to absorb energy during a sudden impact without fracturing. It is a critical property for materials exposed to sudden effects or shock loadings, such as construction, manufacturing, and transportation. 10~20J/cm2
Fusion Point A fusion point is the temperature at which a solid substance transitions into a liquid state when heated. It is also known as the melting point. 660oC Elongation Elongation is a mechanical property that describes the amount of deformation a material undergoes before it fractures or breaks under load. It is often used to describe the ductility or malleability of a material. 11%~25%
Boiling Point The boiling point measures the temperature at which the vapor pressure of a liquid equals the atmospheric pressure above it, causing the liquid to change into a gas or vapor. 2327oC Resistivity Resistivity measures the electrical resistance of a material per unit length and cross-sectional area. It is a fundamental material property that describes how well it resists the flow of electrical current. 2.83 ×10-8Ω·m
Specific Heat Specific heat is a material-specific parameter that quantifies the ability of a substance to release or absorb heat energy when its temperature changes. 0.88 x103J/(KgoC) Magnetism Magnetism is a property of materials that causes them to attract or repel other materials based on their magnetic field. It is the ability of a material to create a magnetic field, which can be either permanent or induced by an external magnetic field. Nonmagnetic
Tensile Strength Tensile strength measures the maximum stress that a material can withstand while being pulled or stretched before it breaks. 80~100MPa Thermal Conductivity Thermal conductivity is a measure of how well a material conducts heat. It is the rate at which heat energy is transferred through a material per unit time and per unit area, under a steady temperature gradient. 237W/mK
Yield Strength Yield strength measures the maximum stress that a material can withstand before it begins to exhibit plastic deformation, that is, a deformation that remains even after the load is removed. 20~90MPa Elastic Modulus Elastic Modulus measures a material’s stiffness and ability to resist deformation under stress. It is defined as the ratio of stress to strain in a material within the elastic limit of the material. 70GPa
Hardness Hardness measures a material’s resistance to surface indentation or abrasion. It is the ability of a material to withstand scratching, rubbing, or pressing without deforming or wearing away. 24~32HB Linear Expansion Coefficient Linear expansion coefficient, or thermal expansion coefficient, measures how much a material expands when heated or contracts when it is cooled. It is defined as the fractional change in length or volume of a material per unit change in temperature. 2.4 x10-5C

Properties of Aluminum

Aluminum exhibits outstanding performance when used for manufacturing different products. Excellent conductivity, lightweight, good machinability, high corrosion resistance, and magnetism are some essential qualities of aluminum that enable it to outperform in manufacturing industries.

Aluminum Materials FAQs -

FAQs Related To Aluminum

A: Aluminum profiles can suffer from various defects during the manufacturing process or due to external factors. Some of the common defects of aluminum profiles are:

  1. Surface scratches: Scratches can occur during handling, transportation, or installation. They can weaken the surface of the profile, reducing its strength and resistance to corrosion.
  2. Surface cracks: Surface cracks can occur due to improper handling or excessive stress during manufacturing. These cracks can weaken the profile and cause it to fail prematurely.
  3. Corrosion: Corrosion can arise due to exposure to moisture or chemicals, resulting in a weakened surface that can compromise the structural integrity of the profile.
  4. Surface pitting: Pitting can occur due to exposure to corrosive environments, such as saltwater or acid rain. Pitting can cause the profile to weaken and fail prematurely.
  5. Surface bubbles: Surface bubbles can occur due to gas pockets trapped during manufacturing. These bubbles can weaken the profile, reducing its strength and durability.
  6. Deformation: Deformation can occur due to excessive stress during manufacturing or use, causing the profile to warp or bend. This can affect the profile's ability to perform its intended function.
  7. Welding defects: Welding defects, such as cracks or porosity, can occur during welding. These defects can weaken the weld and cause the profile to fail prematurely.

Overall, the defects of aluminum profiles can significantly impact their strength, durability, and performance. It is important to carefully inspect and test aluminum profiles for defects to ensure they meet the necessary quality standards for their intended use.

A: Extruding aluminum profiles involves a complex manufacturing process, and preventing defects requires careful attention to every step. Here are some ways to prevent defects when extruding aluminum profiles:

  1. Raw material selection: Start by selecting high-quality raw materials that meet the necessary standards. The aluminum should be free from impurities that can cause defects during extrusion.
  2. Extrusion process optimization: Carefully monitor and control the extrusion process, including temperature, pressure, and speed, to ensure consistent quality and prevent defects. Extrusion parameters should be optimized for each profile design to minimize the risk of defects.
  3. Die design: Proper die design prevents defects in aluminum profiles. The die should be designed to ensure uniform material flow and minimize the risk of voids, cracks, or other defects.
  4. Tooling maintenance: Regular extrusion equipment maintenance and tooling maintenance can help prevent defects. Worn or damaged tooling should be replaced promptly to ensure consistent quality.
  5. Inspection and testing: Regular inspection and testing of the extruded profiles can help identify defects early on. This includes visual inspection, dimensional inspection, and non-destructive testing techniques.
  6. Quality control: Implement a comprehensive quality control system to monitor the entire extrusion process and ensure consistent quality. This includes testing raw materials, monitoring process parameters, and inspection of finished profiles.

Overall, preventing defects in extruded aluminum profiles requires a comprehensive approach that addresses every step of the manufacturing process. By following best practices and implementing quality control measures, it is possible to produce high-quality aluminum profiles with minimal defects.

A: There are several surface treatment methods for aluminum, each with benefits and limitations. Here are some most common methods:

  1. Anodizing: Anodizing is a process of electrochemically coating the aluminum surface with a protective oxide layer. This layer provides corrosion resistance, improves durability, and can be used for decorative purposes. Anodizing can produce a variety of colors depending on the process used.
  2. Powder coating: Powder coating involves applying a dry powder to the aluminum surface and heating it to form a protective layer. This layer provides excellent durability and corrosion resistance and can be used for decorative purposes. Powder coating can produce a wide range of colors and textures.
  3. Painting: Painting is an aluminum surface treatment method that provides corrosion resistance and decorative finishes. Depending on the application, various types of paint can be used, including acrylic, epoxy, and polyurethane.
  4. Polishing: Polishing involves buffing the aluminum surface to a high shine. This is often used for decorative purposes and can also improve the surface's resistance to corrosion.
  5. Brushing: Brushing involves using a wire brush or abrasive material to create a pattern on the aluminum surface. This can be used for decorative purposes and improve the surface's scratch resistance.
  6. Chromate conversion coating: Chromate conversion coating treats the aluminum surface with a chemical solution that provides corrosion resistance and improves adhesion for subsequent coatings or paint.

Each of these surface treatment methods has its advantages and disadvantages, and the best approach will depend on the specific application and requirements of the aluminum part.

A: Several common defects can occur in aluminum castings. Here are some of the most common defects:

  1. Porosity: This defect occurs when air pockets or gas bubbles get trapped in the casting during solidification, creating voids or holes in the metal. Porosity can weaken the casting and reduce its structural integrity.
  2. Shrinkage: Shrinkage occurs when the metal contracts as it cools, causing voids or cracks in the casting. This defect is most commonly found in thick sections of the casting.
  3. Cold shuts: Cold shuts occur when two sections of molten metal fail to fuse correctly during solidification, leaving a seam or crack in the casting.
  4. Inclusions: Inclusions are foreign particles or impurities that get trapped in the casting, such as sand or slag. These can weaken the casting and reduce its quality.
  5. Misruns: Misruns occur when the molten metal fails to fill the mold cavity, leaving the casting incomplete or with thin sections.
  6. Warping or distortion: This defect occurs when the casting undergoes uneven cooling, or internal stresses build up during solidification, causing the casting to warp or deform.
  7. Hot tears: Hot tears occur when the metal solidifies before it can contract correctly, resulting in a crack or tear in the casting.

Preventing these defects requires careful attention to the casting process, including proper mold design, precise control of the melting and pouring processes, and effective quality control measures.

A: Aluminum profiles do not rust like steel or iron. This is because aluminum is a non-ferrous metal and does not contain iron, which is the metal that rusts when exposed to moisture and oxygen. However, aluminum can still corrode when exposed to certain environmental conditions, such as saltwater or acidic environments.

The corrosion process for aluminum is different from rusting for iron or steel. When aluminum corrodes, it forms a thin layer of aluminum oxide on the metal's surface, which protects the metal from further corrosion. This process is called passivation. However, the underlying metal can be exposed to further corrosion if the protective layer is damaged or scratched.

To prevent corrosion of aluminum profiles, various surface treatment methods such as anodizing, powder coating, or painting can be used to provide a protective layer on the surface of the metal. Additionally, proper maintenance, such as regular cleaning and lubrication of the aluminum profile, can help prevent corrosion and extend its lifespan.

A: Aluminum profiles are generally more expensive than iron profiles for several reasons:

  1. Raw material cost: The cost of raw aluminum is generally higher than the cost of raw iron. This is due to the higher cost of mining and refining aluminum ore and the energy-intensive process of producing aluminum.
  2. Manufacturing process: The manufacturing process for aluminum profiles is more complex and requires more advanced equipment than iron. This can increase the cost of production.
  3. Surface treatment: Aluminum profiles often require additional surface treatment, such as anodizing or powder coating, to protect against corrosion and provide a decorative finish. These treatments add to the cost of the finished product.
  4. Weight: Aluminum profiles are generally lighter than iron profiles, but the cost of aluminum is still relatively high compared to its weight. This means a larger aluminum volume is required to produce a similar strength and stiffness as iron, increasing the cost.
  5. Specialized applications: Aluminum profiles are often used in specialized applications where their specific properties, such as high strength-to-weight ratio and corrosion resistance, are required. These technical applications often require higher-quality materials and manufacturing processes, which can increase the cost.

Overall, while aluminum profiles may be more expensive than iron profiles, they offer several advantages that can make them a more cost-effective choice in specific applications, such as improved durability, corrosion resistance, and ease of fabrication.

A: Aluminum profiles are used in various applications across various industries owning to their unique properties and versatility. Here are some common uses of aluminum profiles:

  1. Construction and architecture: Aluminum profiles are often used in construction and architecture for windows, doors, curtain walls, and other building components. They are lightweight, durable, and corrosion-resistant, making them ideal for exterior use.
  2. Transportation: Aluminum profiles are used in the transportation industry for manufacturing components such as car frames, aircraft parts, and train bodies. The lightweight and high strength-to-weight ratio of aluminum makes it an ideal material for transportation.
  3. Electrical and electronics: Aluminum profiles are also used in the electrical and electronics industry for manufacturing components such as heat sinks, LED lighting fixtures, and electronic enclosures. Aluminum's high thermal conductivity and low electrical conductivity make it an ideal choice for these applications.
  4. Industrial machinery: Aluminum profiles are used to produce machinery and equipment for food processing, packaging, and automation industries. The high strength-to-weight ratio and corrosion resistance of aluminum make it an ideal choice for these applications.
  5. Furniture: Aluminum profiles are also used in furniture manufacturing due to their aesthetic appeal, lightweight, and durability.
  6. Solar energy: Aluminum profiles are used in producing solar panels and solar energy systems due to their high strength-to-weight ratio, lightweight, , and corrosion resistance.

Overall, the versatility of aluminum profiles makes them a popular choice for various industries and applications where lightweight, durable, and corrosion-resistant materials are required.

A: Aluminum is often referred to as a "flying metal" because it is widely used in the aerospace industry for manufacturing aircraft and spacecraft. The properties of aluminum make it an ideal choice for these applications:

  1. Lightweight: Aluminum is a very light metal, which is a crucial factor in the aerospace industry, where reducing weight is essential to improving fuel efficiency and performance.
  2. High strength-to-weight ratio: Aluminum has a high strength-to-weight ratio, which means it is strong and durable while still lightweight.
  3. Corrosion-resistant: Aluminum is highly resistant to corrosion, which is essential for aerospace applications where aircraft and spacecraft are exposed to harsh environments such as high altitudes and extreme temperatures.
  4. Easy to work with: Aluminum is a highly malleable metal that can be easily formed into various shapes and sizes, making it ideal for manufacturing complex aerospace components.

Combining these properties makes aluminum a highly desirable material for the aerospace industry. The lightweight and high strength-to-weight ratio of aluminum allows for greater fuel efficiency and increased range. At the same time, the corrosion-resistant properties ensure that the aircraft or spacecraft remains operational in harsh environments.

A: Aluminum processing deformation can be reduced through the following technological measures and operating skills:

  1. Proper selection of processing equipment: Choosing the right processing equipment, such as press machines, can help reduce deformation during manufacturing.
  2. Control of processing parameters: Proper control of processing parameters, such as temperature, speed, and pressure, can help to minimize deformation during the manufacturing process.
  3. Use of appropriate tooling and fixtures: Proper tooling and fixtures can reduce deformation by providing the necessary support and guidance during manufacturing.
  4. Selection of appropriate lubricants: Using suitable lubricants can help reduce friction during the manufacturing process, which can help minimize deformation.
  5. Proper handling and storage: Proper handling and storage of aluminum profiles can help to minimize deformation during transportation and storage.
  6. Skilled operators: Skilled operators trained in proper manufacturing techniques and operating procedures can help minimize deformation during the manufacturing process.
  7. Quality control measures: Implementing quality control measures such as inspection and testing can help to identify and correct any issues that may cause deformation.

Overall, reducing aluminum processing deformation requires a combination of proper equipment selection, process control, tooling and fixture design, lubrication, handling and storage, skilled operators, and quality control measures.

A: Shot blasting is a typical surface treatment process for aluminum castings, and several issues should be paid attention to in the shot blasting process:

  1. Blasting media selection: The blasting media should be chosen carefully to avoid any damage to the aluminum castings. It is recommended to use soft media like glass beads, ceramic beads, or plastic media.
  2. Blasting pressure: The blasting pressure should be adjusted according to the aluminum castings' shape, size, and thickness. The blasting pressure should not be too high, as it can cause deformation, and not too low, as it can affect the surface finish.
  3. Blasting time: The blasting time should be controlled appropriately to avoid over-blasting, which can cause surface roughness, pits, or scratches.
  4. Pre-cleaning: The aluminum castings should be cleaned thoroughly before the shot blasting process to remove any grease, oil, or other contaminants that can interfere with the shot blasting process.
  5. Post-cleaning: After the shot blasting process, the aluminum castings should be cleaned again to remove any blasting media or dust that may be left on the surface.
  6. Protective measures: Proper protective measures such as covering or masking critical areas of the aluminum castings that should not be blasted can help to avoid any unwanted surface roughness.
  7. Equipment maintenance: Regular maintenance and cleaning of the shot blasting equipment can help to ensure that it operates properly and delivers consistent results.

By paying attention to these issues, shot blasting can be an effective surface treatment process for aluminum castings, providing a smooth and uniform surface finish that is free of defects.

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