Aluminum, the most abundant metal in Earth's crust, is rarely found in its pure elemental form. Its various alloys are prized for their low density, high strength-to-weight ratio, durability, and resistance to corrosion. Being 2.5 times less dense than steel, aluminum serves as an excellent alternative in applications where mobility and portability are key.
Goto LITONG to know more.
Aluminum alloys are known for their ductility and malleability, making them easy to shape and machine. They also excel as electrical and thermal conductors and possess non-sparking and non-magnetic properties. Aluminum is highly recyclable, with re-melting requiring just 5% of the energy used to produce the primary metal. Impressively, 75% of aluminum can be reclaimed for reuse without any loss of its original properties, contributing to its sustainability and environmental friendliness.
Pure aluminum is alloyed with various elements to enhance its mechanical properties, corrosion resistance, formability, and machinability, leading to different grades. The Aluminum Association developed and maintains the nomenclature for these standard aluminum grades, classifying them based on their primary alloying element and how they respond to mechanical and thermal treatments.
Aluminum alloys are primarily classified into two types: wrought and cast. These categories use distinct identification numbering systems. The key difference lies in their processing methods: cast aluminum is melted and poured into molds, whereas wrought aluminum is manipulated in its solid form.
The various manufacturing processes yield aluminum alloys with distinct properties, making it challenging to select the right grade for a project. Cast aluminum contains a higher proportion of alloying materials, whereas wrought aluminum offers greater tensile strength.
Wrought aluminum has exceptional mechanical strength and can be formed into many shapes. It is produced by smelting aluminum ingots with a measured amount of an alloying metal, resulting in the grade's composition. The smelted aluminum alloy is cast into billets or slabs and mechanically processed by rolling, forging, or extrusion. Heat treatment further improves the aluminum alloy's natural properties.
The advantages of wrought aluminum include:
Each wrought aluminum grade is identified by a four-digit code:
Here is a summary of the wrought aluminum series: Series represents the purest aluminum, featuring the lowest yield and tensile strength. In contrast, the series, which includes alloys of magnesium, zinc, and copper, offers the highest tensile and yield strength.
The following are the series of wrought aluminum grades:
The series of aluminum alloys is non-heat treatable and consists of at least 99.0% pure aluminum with minimal alloying elements. This series is known for its outstanding corrosion resistance and superior electrical and thermal conductivity. Due to its ductility and relatively soft nature, series aluminum is easily formable and hardens slowly with work. It is ideal for applications that require significant deformation. While it is weldable, it has a narrow melting range that needs to be managed. However, a notable limitation of the series is its very low yield and tensile strength.
The series aluminum grades are composed of 0.7-6.8% copper, along with trace amounts of silicon, manganese, magnesium, and other elements. Copper serves as the primary alloying element, enhancing the strength and hardness of these grades while also improving their machinability. These alloys retain their high strength across a broad temperature range.
series aluminum grades are known for their high performance and strength, making them ideal for aircraft and aerospace applications. However, the inclusion of copper in these alloys reduces their ductility and corrosion resistance.
The series consists of heat-treatable aluminum alloys that can be strengthened through precipitation hardening. This process enhances the alloy's hardness by forming the intermetallic compound Al2Cu during heat treatment. However, these intermetallic compounds can complicate welding, as some series alloys are prone to issues such as hot cracking and stress corrosion cracking, making them less suitable for arc welding.
The series aluminum grades are characterized by a manganese content ranging from 0.05% to 1.5%, which is the primary alloying element. Manganese enhances the alloy's mechanical strength compared to pure aluminum, with this strength being stable across a broad temperature range. These grades also offer excellent corrosion resistance, high ductility, and good formability. Although they cannot be heat-treated, they can be hardened through cold working. Additionally, series aluminum is well-suited for welding applications.
The series of aluminum grades include 3.6-13.5% silicon, along with minor quantities of copper and magnesium. Silicon is the primary alloying element, which reduces the alloy's melting point and enhances fluidity when molten. This characteristic makes the series particularly effective as a filler material for welding and brazing.
Certain grades within the series are heat-treatable based on the copper and magnesium content in the alloy. These additions enhance the alloy's response to heat treatment. When combined with heat-treatable aluminum grades, the heat-treatable grades can also be suitable for welding applications.
The series aluminum alloys contain 0.5-5.5% magnesium. These alloys are non-heat-treatable but can be strengthened through cold working. They offer moderate to high strength and high ductility when annealed. Additionally, series aluminum alloys are weldable and resistant to corrosion and alkaline environments.
The series grades contain 3.5% magnesium and are not ideal for high-temperature applications due to their susceptibility to stress corrosion. Known as marine grades of aluminum, the series is valued for its resistance to saltwater corrosion.
The series aluminum grades primarily include 0.2-1.8% silicon and 0.35-1.5% magnesium as their key alloying elements. These grades can undergo solution heat treatment to boost their yield strength. During aging, the precipitation of magnesium-silicide further strengthens the alloy. Higher silicon content improves precipitation hardening but may reduce ductility. This reduction can be countered by adding chromium and manganese, which help to inhibit recrystallization during heat treatment. However, welding these grades can be challenging due to their susceptibility to solidification cracking, requiring careful welding techniques.
The series aluminum alloys feature zinc as their primary alloying element, ranging from 0.8% to 8.2%. Known for their exceptional strength, these alloys are heat treatable, allowing for solution heat treatment and aging to boost yield strength. The presence of intermetallic compounds like MgZn2 and Mg3Zn3Al2t contributes to their hardness. Enhanced corrosion resistance is achieved with the inclusion of copper. However, many alloys in this series are not suitable for welding due to their vulnerability to stress corrosion cracking and hot cracking.
Cast aluminum is made from bauxite dissolved in caustic soda, causing the alumina to crystallize and settle to the bottom of the container. The alumina is broken down using an electric current that separates the aluminum from the oxygen. The aluminum from the process is sent to a casting house to remove impurities and to be formed in pure aluminum billets.
After purifying and shaping the aluminum into billets, it is melted and combined with alloying elements. The resulting mixture, consisting of aluminum and alloys in various proportions, is then poured into molds to create products or shaped for additional processing.
Cast aluminum alloys generally have lower tensile strength compared to wrought aluminum due to defects introduced during the molding process, making them more prone to cracking and shrinkage. Nevertheless, cast aluminum remains a cost-effective choice that can be molded into a wide range of shapes. When molten, cast aluminum readily conforms to the mold, filling every detail and crevice.
Each cast aluminum grade is designated by a four-digit code that includes a decimal point.
Here are the series of cast aluminum alloys:
The 1XX.X series aluminum grades are known for their high electrical and thermal conductivity, excellent weldability, and superior corrosion resistance and finishing qualities.
The 2XX.X series aluminum grades are heat-treatable and known for their high strength and low fluidity. However, they exhibit low corrosion resistance and ductility, and are prone to hot cracking.
The 3XX.X series aluminum grades are heat-treatable, offering high strength along with excellent wear and crack resistance. However, their higher copper content can reduce their corrosion resistance, and they tend to have lower ductility.
The 4XX.X series aluminum grades are non-heat-treatable and offer moderate strength. Known for their excellent machinability, these grades feature high ductility and are also noted for their good impact resistance, corrosion resistance, and casting properties.
The 5XX.X series aluminum grades are not heat-treatable but offer excellent corrosion resistance and a pleasing appearance when anodized. Additionally, they feature moderate to high strength, good machinability, and favorable casting properties.
The 7XX.X series aluminum grades are heat-treatable, offering high strength, excellent corrosion resistance, dimensional stability, and good finishing qualities. However, they are known for their poor casting properties.
The 8XX.X series aluminum grades are non-heat-treatable. They offer excellent machinability and wear resistance because of their low coefficient of friction, but they have relatively low strength.
The temper designation system helps assess how an alloy will respond to welding and other fabrication processes, based on its strengthening and hardening treatments. This system applies to both wrought and cast aluminum alloys.
The temper designation of an aluminum alloy consists of a capital letter followed by a number or numbers, indicating whether the alloy is strain-hardened or thermally treated. This designation is separated by a hyphen from the alloy number (e.g., -H32).
Aluminum's widespread use stems from its abundance, versatile properties, and excellent recyclability. This metal finds application in everything from cookware to the structural framework of high-rise buildings. Its ability to be shaped, bent, formed, and welded into various configurations makes it a top choice for structural applications.
Although flat, thick pieces of aluminum are available for shipping, aluminum coils are widely used to store and ship aluminum. They have a hollow core wrapped with aluminum. Aluminum coils come in several different lengths, widths, and thicknesses. All different alloyed grades are produced in coils and shipped for manufacturing purposes.
Aluminum coils can be painted, diamond-coated, or heat-treated for enhanced durability. They are designed to endure constant use and harsh conditions. However, the main limitation of aluminum coils is their thickness; some grades may be too thick to wrap around the core.
Coiled aluminum plays a crucial role in various industrial processes, such as the production of air conditioners, automobiles, aircraft, furniture, cases, and construction materials. In metalworking, aluminum coils are positioned at the start of the process, with the aluminum material fed into progressive metal shaping machines for further processing.
Aluminum is commonly used in fin stocks, heat exchangers, and heat sinks because of its excellent thermal conductivity. It is typically cold worked at or near room temperature. As one of the softest aluminum alloys, Series is easily shaped through spinning, stamping, and drawing processes, all without the need for heat. It can be formed into various shapes, including foil, plates, round bars, rods, sheets, strips, and wire.
Series aluminum is employed in the manufacturing of rivets, deep-drawn components like pots and kitchen sinks, railroad tank cars, and reflectors. Its excellent conductivity also makes it ideal for electrical applications.
Aluminum is employed in manufacturing machines, automotive components, weapons, munitions, fasteners, pipe and tube fittings, and atomizer parts. Its high mechanical strength facilitates machining, and it is classified as a free-machining alloy (FMA) that can be efficiently shaped using a lathe.
Its exceptional machining capabilities enable the creation of complex and intricate parts with precise details using Series aluminum. While it has poor corrosion resistance, this issue is effectively addressed through anodization, which offers excellent surface protection. Although aluminum cannot be welded, its ability to produce precise details through machining eliminates the need for welding.
Aluminum is the top choice for aircraft and aerospace applications due to its superior strength and fatigue resistance. As one of the most well-regarded high-strength aluminum alloys, it is ideal for manufacturing aircraft components. Its exceptional strength-to-weight ratio and smooth finish make it a preferred material for applications requiring durability and precision.
Aluminum stands out due to its unique properties, allowing it to be annealed and heat treated—features not commonly found in other aluminum alloys. However, similar to series , aluminum cannot be arc or gas welded, though it can be joined using spot, seam, or flash welding methods.
Similar to Series , aluminum exhibits low corrosion resistance, which can be mitigated through anodization or by cladding it with a surface layer of pure aluminum. Consequently, it is extensively used in marine equipment, wing tension members, bolts, nuts, hydraulic valve components, gears, shafts, couplings, and pistons.
Aluminum is commonly used in various applications, including heat exchangers, pressure vessels, storage tanks, and fuel tanks. It is also suitable for food-handling items like cooking utensils, pans, pots, ice cube trays, and refrigerator panels. Additionally, this versatile aluminum alloy is crafted into building products such as roofing materials, sidings, gutters, garage doors, insulation panels, and downspouts.
Aluminum is widely used in construction for applications such as roofing, siding, and furniture, and it is also an effective electrical conductor. Its adaptability makes it suitable for chemical and food handling equipment, HVAC systems, tanks, vessels, and high-strength foils. Additionally, its bright finish is perfect for decorative purposes.
Aluminum is utilized in various applications, including shipbuilding, vehicles, rail cars, pressure vessels, and drilling rigs.
Aluminum is commonly employed in a variety of applications including food processing equipment, cooking utensils, heat exchangers, and chemical storage tanks. It is also utilized in automobile and truck panels, flooring panels, rivets, wires, treadplates, and containers.
Aluminum can be crafted into tubes, beams, and angles with rounded corners. It is commonly utilized in pipelines, tank fittings, railroad cars, trucks, marine components, and furniture.
Aluminum is commonly employed in architectural applications, including stair rails, furniture, window frames, doors, and sign frames. It is also versatile enough to be fabricated into tubes, beams, angles, and channels.
Aluminum is utilized in a variety of applications, including screw machine products, hinge pins, knobs, nuts, couplings, valves, marine fittings, pipeline fittings, and decorative hardware.
Aluminum is highly favored for aerospace and aircraft applications due to its exceptional strength. Additionally, it finds applications in bicycle components, high-performance sporting gear, molds, and industrial tooling.
The 1XX.X series is used in the production of electrical rotors.
The 2XX.X series is utilized in manufacturing automotive and aircraft engine cylinder heads, diesel engine pistons, bearings, and components for exhaust systems.
The 3XX.X series is used in various applications, including compressor and pump components, automotive cylinder blocks and heads, motor parts, and castings for marine and aircraft use.
The 4XX.X series is utilized in pump casings, pots, pans, and dental equipment.
The 5XX.X series is designed for decorative architectural applications and sand casting components.
The 7XX.X series is utilized in automotive components and mining machinery.
The 8XX.X series is used in slide bearings and bushings.
Aluminum products are available in the following forms:
Aluminum foils are produced by flattening and thinning aluminum sheets through a rolling mill. Their thickness varies between 0.006 and 0.2 mm (6 to 200 microns). Known for their malleability and pliability, aluminum foils can be easily bent and wrapped around objects. They are commonly used in packaging, electromagnetic shielding, and various other industrial applications.
Aluminum foil serves various purposes, including thermal insulation, decoration, and mold creation. It is available in different tempers, each with its own processing characteristics. The tempering of aluminum foil is denoted by the HXX designation, where "H" indicates the work hardening process used to enhance the foil's strength. The following two or three numbers specify the type of tempering applied.
The second digit of the HXX code is the degree of strain hardening.
A third digit might be used for wrought products, where H111, H311, and H321 indicate that the aluminum foil has been strain hardened to a lesser degree than usual.
Aluminum bars come in various shapes—including round, flat, hexagonal, and square—and are offered in a range of thicknesses, widths, and diameters. When selecting aluminum bars, it's important to choose the grade that best meets the requirements of the application, as each grade differs in strength, machinability, and corrosion resistance.
Aluminum bars are manufactured through an extrusion process, where an annealed aluminum billet is pressed through a die using compressive force. As the billet is forced through the die, it assumes the shape of the die's profile. This extrusion method produces aluminum bars in round, rectangular, square, and hexagonal shapes.
Aluminum pipe, with its tubular shape, is designed for the movement and flow of liquids and gases. Like other aluminum products, it is lightweight, corrosion-resistant, and produced through an extrusion process that results in seamless pipe. Aluminum pipes typically come in round and square shapes, with custom designs available to suit specific applications.
The aluminum used for producing aluminum pipe is high-strength, heat-treated hard aluminum, which is strengthened through heat treatment. This type of aluminum exhibits medium plasticity in its annealed, quenched, and thermal states, and has good spot welding characteristics. Aluminum pipe can be machined through cold working and quenching, and its corrosion resistance can be further enhanced through anodizing and coating.
Aluminum pipe has a vast range of applications, including aviation, the automotive industry, chemical processing, agriculture, and shipbuilding. Its lightweight nature, strength, and conductivity make it well-suited for heavy-duty industrial uses. The properties of aluminum pipe can vary depending on the grade of aluminum used in its production.
While aluminum tubes resemble aluminum pipes in appearance, they serve different purposes and functions. Both aluminum pipes and tubes are long, hollow, and can be either rectangular or round in shape. However, aluminum tubing is defined by its outer diameter (OD) and wall thickness (WT), which are measured in inches or millimeters.
Aluminum tubing is lightweight with good heat conductivity and is used for hydraulic systems, airplane fuselages, HVAC equipment, and appliances. Each of the various types of aluminum tubing are custom designed to fit the needs of specialized applications. Square tubing is used for machine parts while rectangular tubing is used for interior and exterior molding. Round tubing is ideal for structural supports and framework.
Aluminum grades and are commonly used for manufacturing aluminum tubing. Grade is known for its high strength and can be heat treated to enhance its corrosion resistance. In contrast, grade is a lower-strength aluminum, making it ideal for architectural details and applications where high strength is not required.
Aluminum sheets are created by repeatedly rolling aluminum slabs under high pressure until they become thin and flat. The thickness of the sheets varies based on the gauge of the aluminum.
Contact us to discuss your requirements of aluminium coils for transport applications. Our experienced sales team can help you identify the options that best suit your needs.
Aluminum sheets are favored for their lightweight, impressive strength, and ability to withstand demanding conditions. Despite their ease of handling, these sheets are highly durable, making them an ideal choice for industries that need to reduce weight without compromising on resilience.
Aluminum sheets are primarily used in the production of cans and packaging materials. Their formability and corrosion resistance make them ideal for beverage cans, food containers, and various packaging solutions. The tight seal provided by aluminum helps preserve the freshness and quality of the contents. Additionally, aluminum's recyclability enhances its popularity in the packaging industry.
The automotive industry leverages the strength-to-weight ratio of aluminum sheets to improve fuel efficiency and vehicle performance. These sheets are used in body panels, hoods, doors, and structural components, offering a lightweight option that maintains safety and durability. Additionally, aluminum sheets are widely used in cookware manufacturing and construction applications, including roofing, siding, and gutters.
Aluminum plates are manufactured using a rolling process similar to that used for sheets but are thicker and available in various thicknesses depending on the gauge and grade of aluminum. Their increased thickness provides greater strength and rigidity, making them ideal for heavy-duty applications.
The characteristics of aluminum plates make them well-suited for use in the transportation, aerospace, aircraft, marine, and military industries, where they serve as structural supports, body panels, wings, and fuselage sections. Their favorable strength-to-weight ratio enhances fuel efficiency and performance. Additionally, the corrosion resistance and durability of aluminum plates make them ideal for demanding environments, including storage tanks, fuel tanks, railcars, trailers, and truck beds.
Aluminum wires are produced through a process known as wire drawing, where aluminum ingots are pulled through a die to decrease their diameter while increasing their length. Aluminum wire's electrical conductivity and strength-to-weight ratio make it a viable alternative to copper in certain electrical applications. However, a drawback of aluminum wire is its susceptibility to oxidation, which can lead to wiring deterioration and potential fire hazards.
To reduce the risks associated with aluminum wire oxidation, several precautions can be taken. One effective method is using aluminum alloy wires, which are specifically engineered to enhance resistance to oxidation and improve overall performance. Compared to pure aluminum wires, aluminum alloys offer better corrosion resistance and a longer lifespan.
As with any type of wiring, choosing the proper installation method is crucial for the effective use of aluminum wire. This involves using connectors specifically designed for aluminum wires and employing appropriate insulation to protect against moisture and environmental factors.
Brazing is a metal joining technique where aluminum brazing rods or fillers are used to join base metals by heating. When the aluminum reaches its melting point, it bonds metal pieces together or fills cracks, holes, and gaps. Brazing is favored for its exceptional strength and durability.
There are four main methods of brazing: torch, dip, fluxless vacuum, and furnace. Torch brazing uses a propane or gas torch to heat the metal. In dip brazing, the filler metal is poured around the joint area and then dipped into a molten bath. Fluxless vacuum brazing removes flux from the process using water or a chemical bath. Finally, furnace brazing involves placing the metals in a furnace, a process that requires careful monitoring.
Brazing forms robust, solid joints at lower temperatures compared to welding, allowing the base metal to retain its original properties. This method facilitates the joining of dissimilar metals while producing a smooth and visually appealing finish. In manufacturing, brazing is often fully automated and generally faster than welding.