Aluminum Coil
The term "aluminum coil" describes aluminum that has been flattened into sheets where their width is significantly higher than their thickness and then "coiled" into a roll. Stacks of individual aluminum sheets are difficult to...
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This article takes an in-depth look at the types of aluminum.
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Aluminum is the most abundant metal in Earth’s crust but rarely exists in elemental form. The various forms of aluminum and its alloys are valued for their low density and high strength-to-weight ratio, durability, and corrosion resistance. Since aluminum is 2.5 times less dense than steel, it is an excellent alternative to steel in applications requiring mobility and portability.
The many aluminum alloys are ductile and malleable, making them easy to form and machine. They are good electrical and thermal conductors with non-sparking and non-magnetic properties. Aluminum is recyclable, with a low re-melting temperature that requires 5% of the energy needed to produce the primary metal. Seventy-five percent of aluminum can be recovered for reuse without losing its properties, which makes aluminum sustainable and environmentally friendly.
Pure aluminum is combined with different alloying elements to modify its mechanical properties, corrosion resistance, and formability and machinability, which determines the various grades. The Aluminum Association created and is responsible for maintaining the nomenclature for the standard aluminum grades, which are categorized according to their main alloying element and mechanical and thermal treatment response.
There are two main classifications of aluminum alloys: wrought and cast aluminum. Each classification has a different identification numbering system to distinguish it. Wrought and cast aluminum are differentiated by how they are processed, with cast aluminum being melted and poured into a mold, while wrought aluminum is worked in solid form.
The different manufacturing processes produce grades of aluminum alloys with unique properties. The classifications add to the difficulty of determining which grade of aluminum to use for a project. Cast aluminum has a higher percentage of alloying material, while wrought aluminum has 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:
A four-digit number code identifies each wrought aluminum grade:
The table below summarizes the wrought aluminum series. Series 1000 is the purest form of aluminum with the lowest yield and tensile strength, while the 7000 series, with alloys of magnesium, zinc, and copper, has the highest tensile and yield strength.
Temper | Composition | Tensile Strength (MPa) | Yield Strength (MPa) |
---|---|---|---|
1000 Series | 99.00%-99.99% Aluminum | 82-166 | 28-152 |
2000 Series | 2.2%-6.8% Copper | 110-283 | 41-248 |
3000 Series | 0.3%-1.5% Manganese | 110-283 | 41-248 |
4000 Series | 3.6%-13.5% Silicon | 172-414 | 45-180 |
0.1%-4.7% Copper | |||
0.05%-5.5% Magnesium | |||
5000 Series | 0.05%-5.5% Magnesium | 124-352 | 41-345 |
6000 Series | 0.2%-18% Silicon | 124-310.3 | 55.2-276 |
0.35%-1.5% Magnesium | |||
7000 Series | 0.8%-8.2% Zinc | 228-572 | 103-503 |
0.1%-3.4% Magnesium | |||
0.05%-2.6% Copper |
The following are the series of wrought aluminum grades:
The 1000 series is non-heat treatable and contains at least 99.0% aluminum with no significant alloying elements. Aluminum grades under this series have excellent corrosion resistance and the highest electrical and thermal conductivity. Due to its ductility and relative softness, series 1000 is formable and work hardens slowly. It is suitable for processes requiring severe deformation. Series 1000 is weldable with a narrow melting range that must be considered. A significant drawback to the 1000 series is its very limited yield and tensile strength.
2000 series aluminum grades contain 0.7-6.8% copper and small amounts of silicon, manganese, magnesium, and other elements. Copper is the alloying element for these grades; it imparts additional strength and hardness, improving their machinability. The high strength of these grades is maintained at a wide range of temperatures.
2000 series aluminum grades are high-performance and high-strength alloys; hence, they are suitable for aircraft and aerospace applications. However, the addition of copper also decreases ductility and corrosion resistance.
The 2000 series are heat-treatable aluminum grades. Precipitation hardening can be performed to increase their strength. The precipitation of the intermetallic Al2Cu during heat treatment increases the hardness of the alloy. However, the intermetallic compounds can make these grades challenging to weld. Some 2000 series grades are not suitable for arc welding because of their susceptibility to hot cracking and stress corrosion cracking.
3000 series aluminum grades contain 0.05-1.5% manganese, the main alloying element. Manganese gives the alloy higher mechanical strength than pure aluminum, which is maintained at a wide range of temperatures. They have good corrosion resistance, high ductility, and formability. They are non-heat-treatable and can be hardened by cold working. Finally, they are suitable for welding.
4000 series aluminum grades contain 3.6-13.5% silicon and small amounts of copper and magnesium. Silicon is the main alloying element; it lowers the alloy's melting point, resulting in improved fluidity during the molten state. This makes the 4000 series grades good filler material for welding and brazing.
Some grades under the 4000 series are heat-treatable depending on the amounts of copper and magnesium in the alloy. Such additions will give a favorable response to heat treatment. The heat-treatable grades can be used for welding if combined with the aluminum grades under a heat-treatable series.
5000 series aluminum grades contain 0.5-5.5% magnesium. They are non-heat-treatable, can be hardened by cold working, have moderate-to-high strength, and have high ductility when annealed. Series 5000 aluminums are weldable, with corrosion and alkaline resistance.
The grades in the 5000 series have 3.5% magnesium and are not suitable for high-temperature applications since they are prone to stress corrosion. Series 5000 grades are referred to as marine grades of aluminum due to their resistance to corrosion caused by exposure to salt water.
6000 series aluminum grades contain 0.2-1.8% silicon and 0.35-1.5% magnesium as the major alloying elements. These grades can be solution heat-treated to increase their yield strength. The precipitation of magnesium-silicide during aging hardens the alloy. A high silicon content enhances precipitation hardening, which can result in reduced ductility. Still, this effect may be reversed by adding chromium and manganese, which depresses recrystallization during heat treatment. These grades are challenging to weld because of their sensitivity to solidification cracking, so proper welding techniques must be employed.
7000 series aluminum grades contain 0.8-8.2% zinc as the primary alloying element. This series comprises some of the highest-strength aluminum alloys. The 7000 series grades are heat treatable; solution heat treatment followed by aging can be performed to increase their yield strength. The precipitation of MgZn2 and Mg3Zn3Al2t intermetallic compounds hardens the alloy. The 7000 series grades have high corrosion resistance, which is enhanced by the addition of copper. Most grades in this series are not weldable due to their susceptibility 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.
Once the aluminum has been purified and shaped into billets, it is melted into a molten form and mixed with its alloying elements. Finally, in different percentages, the mixture of aluminum and alloys is poured into molds to produce products or shaped for further processing.
Cast aluminum alloys have lower tensile strength than wrought aluminum due to the defects from the molding process; it is susceptible to cracking and shrinkage. Despite this, cast aluminum is a cost-effective material that can be formed into a wide variety of shapes. In its molten form, cast aluminum easily takes on the shape and form of the mold, filling every portion and crevice.
A four-digit code that includes a decimal value is assigned to each cast aluminum grade:
Grade | Composition (wt%) | Tensile Strength (MPa) | Yield Strength (MPa) |
---|---|---|---|
1XX.X | 99.00%-99.99% Aluminum | 131-448 | 28-152 |
2XX.X | 4.00%-460% Copper | 131-276 | 90-345 |
3XX.X | 5.00%-17.00% Silicon | 117-172 | 66-172 |
4XX.X | 5.00%-12.00% Silicon | 117-172 | 41-48 |
5XX.X | 5.00%-12.00% Magnesium | 131-448 | 62-152 |
6XX.X | Not Used | ||
7XX.X | 6.20%-7.50% Zinc | 207-379 | 117-310 |
The following are the cast aluminum alloy series:
1XX.X series aluminum grades have high electrical and thermal conductivity, good weldability, and excellent corrosion resistance and finishing properties.
2XX.X series aluminum grades are heat-treatable. They have high strength and low fluidity. However, they have low corrosion resistance and ductility and are susceptible to hot cracking.
3XX.X series aluminum grades are heat-treatable. They have high strength and good wear and cracking resistance. However, the increased copper content can make the grade less resistant to corrosion. They also have lower ductility.
4XX.X series aluminum grades are non-heat-treatable and have moderate strength. They have good machinability due to their high ductility. They also have good impact resistance, corrosion resistance, and casting properties.
5XX.X series aluminum grades are non-heat-treatable. However, they have good corrosion resistance and an attractive appearance when anodized. In addition, they have moderate-to-high strength, good machinability, and casting properties.
7XX.X series aluminum grades are heat-treatable. They have high strength, good corrosion resistance, dimensional stability, and good finishing qualities. However, they have poor casting properties.
8XX.X series aluminum grades are non-heat-treatable. They have good machinability and wear resistance due to their low coefficient of friction. However, they have low strength.
The temper designation system is useful in determining the response of a certain alloy to welding and other fabrication processes, which depends on the strengthening and hardening processes it has undergone. This system is used by both wrought and cast aluminum alloys.
The temper designation of an aluminum alloy is composed of a capital letter followed by a number or numbers for strain-hardened and thermally treated alloys. It is separated by a hyphen from the alloy numbering (e.g., 5052-H32).
Letter | Treatment |
---|---|
F | As fabricated alloys, no treatment was performed. |
O | Annealed |
H | Strain-hardened or cold-worked |
W | Solution heat-treated |
T | Thermally treated |
The abundance of aluminum has made it one of the most used metals due to its many positive properties and the ability to recycle it. There is a use for every grade of aluminum, from cookware to the superstructure of high-rise buildings. Since aluminum can be shaped, bent, formed, and welded into innumerable configurations, it is commonly the first metal chosen as a structural metal.
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. They are durable and able to withstand constant use and abuse. The only restriction regarding aluminum coils is their thickness, with certain grades too thick to wrap around the core.
Coiled aluminum is an essential part of several industrial processes, including the manufacture of air conditioners, automobiles, aircraft, furniture, cases, and construction materials. In metalworking, aluminum coils are placed at the beginning of the process and have the aluminum material fed into progressive metal shaping machines.
Aluminum 1100 is used in fin stocks, heat exchangers, and heat sinks due to its high thermal conductivity. It is cold worked at or near room temperature. Series 1100 is one of the softest aluminums; it is shaped by spinning, stamping, and drawing processes without the use of heat. The shapes produced include foil, plates, round bars, rods, sheets, strips, and wire.
Series 1100 aluminum is used to produce rivets, deep-drawn parts (e.g., pots or kitchen sinks), railroad tank cars, and reflectors. In addition, its conductivity makes it suitable for electrical applications.
Aluminum 2011 is used in the production of machines and automotive parts, weapons, munitions, fasteners, pipe and tube fittings, and atomizer parts. It has high mechanical strength that makes it easy to machine. Series 2011 is a free machining alloy (FMA) that can be formed using a lathe.
Its excellent machining capabilities make it possible to use series 2011 to create complex and intricate parts with precision details. Its poor corrosion resistance is overcome by anodization, which provides exceptional surface protection. Although aluminum 2011 is not weldable, the precise details it can produce through machining remove any need for welding.
Aluminum 2024 is the best aluminum grade for aircraft and aerospace applications. It is the best-known of the high-strength aluminum alloys, with excellent fatigue resistance that makes it ideal for aircraft manufacturing. Aluminum 2024 is used in applications where there is a need for a good strength-to-weight ratio as well as a high smooth finish.
The unique properties of aluminum 2024 make it possible to be annealed and heat treated, unlike many of their other aluminum alloys. Regardless of this ability, as with series 2011, aluminum 2024 cannot be arc or gas welded but can be spot, seam, or flash welded.
As with series 2011, aluminum 2024 has very low corrosion resistance that can be compensated for with anodization or clad forming with a surface layer of pure aluminum. As a result, it is widely used in marine equipment, wing tension members, bolts, nuts, hydraulic valve parts, gears, shafts, couplings, and pistons.
Aluminum 3003 is used in heat exchangers, pressure vessels, storage tanks, and fuel tanks. In addition, it can be used in food-handling instruments such as cooking utensils, pans, pots, ice cube traps, and refrigerator panels. It is also manufactured into building products such as roofs, sidings, gutters, garage doors, insulation panels, and downspouts.
Aluminum 5005 is used as a construction material in roofing, sidings, and furniture and as an electric conductor. It is also used in chemical and food handling equipment, HVAC equipment, tanks, vessels, and high-strength foils. Due to its bright appearance, it is helpful in decorative applications.
Aluminum 5083 is used in shipbuilding, vehicles, rail cars, pressure vessels, and drilling rigs.
Aluminum 5052 is used in food processing equipment, cooking utensils, heat exchangers, and chemical storage tanks. This grade is used in automobile and truck panels and components, flooring panels, rivets, wires, treadplates, and containers.
Aluminum 6061 can be made into tubes, beams, and angles with rounded corners. They are used in pipelines, tank fittings, railroad cars, trucks, marine components, and furniture.
Aluminum 6063 is widely used in architectural applications, such as stair rails, furniture, window frames, doors, and sign frames. They can also be made into tubes, beams, angles, and channels.
Aluminum 6262 is used in screw machine products, hinge pins, knobs, nuts, couplings, valves, marine fittings, pipeline fittings, and decorative hardware.
Aluminum 7075 is preferable in aerospace and aircraft applications due to its high strength. It is also used in bike parts, competitive sporting equipment, molds, and industrial tooling.
The 1XX.X series are manufactured into electrical rotors.
The 2XX.X series are used in making automotive and aircraft engine cylinder heads, diesel engine pistons, bearings, and exhaust system parts.
The 3XX.X series are used in compressor and pump parts, automotive cylinder blocks and heads, motor parts, and marine and aircraft castings.
The 4XX.X series are used in pump casings, pots, pans, and dental equipment.
The 5XX.X series are used for decorative architectural applications and sand casting parts.
The 7XX.X series are used in automotive parts and mining equipment.
The 8XX.X series are used in slide bearings and bushings.
Aluminum products can come in the following forms:
Aluminum foils are manufactured by flattening and reducing the thickness of aluminum sheets using a roll mill. The thickness of aluminum foils ranges from 0.006 to 0.2 mm (or from 6 to 200 microns). Aluminum foils are malleable, pliable, and easily bent and wrapped around objects. They are used as packaging and electromagnetic shielding material, as well as in other industrial applications.
Aluminum foil is used as thermal insulation material, decoration, and molds. It comes in different tempers that have their own process properties. The tempering for aluminum foil is referred to as its HXX state. The H in the tempering identification is in reference to the work hardening used to improve the strength of the foil. After the H are two or three numbers, with the first number being the type of tempering.
The second digit of the HXX code is the degree of strain hardening.
Temper | Type |
---|---|
Hx2 | Quarter Hard |
Hx4 | Half Hard |
Hx6 | Three Quarters Hard |
Hx8 | Full Hard |
Hx9 | Extra Hard |
A third digit may be assigned for wrought products, with H111, H311, and H321 indicating that the aluminum foil was strain hardened less than usual.
Aluminum bars are available in round, flat, hexagonal, and square shapes and come in different degrees of thickness, width, and diameters. The process for selecting aluminum bars is based on the grade of aluminum that will fit the needs of an application since each grade has different strength, machinability, and corrosion resistance.
Minimum Strength in KSI | ||||
---|---|---|---|---|
Alloy | Machinability | Ultimate | Yield | Corrosion Resistance |
2011-T3 | A++ | 45 | 38 | C |
6262-T6511 | B | 42 | 35 | A |
2017-T4, T451 | A | 55 | 32 | C |
2024-T4, T351 | A | 62 | 42 | C |
6061-T6-T651 | B | 42 | 35 | A |
7075-T6, T651 | A | 77 | 66 | C |
6063-T6 | C | 30 | 25 | A |
063-T5 | D | 21 | 15 | A |
Aluminum bars are produced using extrusion, which includes passing an annealed aluminum billet, under pressure, through a die using compressive force. As the billet is forced through the die, it takes on the die’s profile. Extrusion produces round, rectangular, square, and hexagonal bars.
Aluminum pipe has a tubular shape that is used in the movement and flow of liquids and gases. As with all forms of aluminum, aluminum pipe is lightweight and corrosion resistant and manufactured using the extrusion process that produces seamless aluminum pipe. The primary shapes of aluminum pipe are round and square with types that are custom designed to fit a specific application.
The types of aluminum used for the production of aluminum pipe is high strength hard aluminum that is heat treated to enhance its strength. It has medium plasticity in its annealing, quenching, and thermal state with good spot welding characteristics. Aluminum pile is machinable using cold working and quenching and may have its corrosion properties improved with anodizing and coating.
There are an endless number of uses for aluminum pipe that include aviation, the auto industry, chemical processing, agriculture, and ship building. Its lightweight, good strength, and conductivity make it ideal for heavy duty industrial applications. The characteristics of aluminum pipe vary according to the grade of aluminum used to produce it.
Although aluminum tubes have a similar appearance to aluminum pipe, they have a different purpose and function. Like aluminum pipes, aluminum tubes are long, hollow centered, rectangular or round shaped tubes. The parameters of aluminum tubing are measured by their outer diameter (OD) and wall thickness (WT), which are expressed 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 6061 and 6063 are used for the manufacture of aluminum tubing with grade 6061 having high strength and can be heat treated to improve its corrosion resistance. Grade 6063 is a low strength aluminum that is suitable for architectural accents and low strength applications.
Aluminum sheets are produced by rolling aluminum slabs several times under high pressure until they are thin and flat at thicknesses that vary according to the gauge of aluminum.
Gauge | Thickness | Thinckness Tolerance |
---|---|---|
(0.250" | 6.35mm) | ±0.014" | |
(0.118" | 4.78mm) | ±0.009" | |
8 gauge | (0.1285" | 3.26mm) | ±0.007 | ±0.18mm |
10 gauge | (0.102" | 2.59mm) | ±0.006 | ±0.15mm |
11 gauge | (0.091" | 2.31mm) | ±0.0045" |
12 gauge | (0.081" | 2.06mm) | ±0.0045" |
14 gauge | (0.064" | 1.63mm) | ±0.0040" |
16 gauge | (0.051" | 1.30mm) | ±0.0035" |
18 gauge | (0.040" | 1.02mm) | ±0.0035" |
20 gauge | (0.032" | 0.81mm) | ±0.0030" |
Aluminum sheets are popular due to their lightweight, excellent strength, and their ability to endure demanding and harsh conditions. Despite their lightweight and easy maneuverability, aluminum sheets are exceptionally durable, which makes them an ideal choice for industries that produce products that require less weight.
A primary application for aluminum sheets is the production of cans and packaging materials. Their formability and corrosion resistance makes them an excellent choice for beverage cans, food containers, and other packaging solutions. The tight seal created by aluminum preserves the freshness and quality of the packaged contents. The recyclability of aluminum contributes to its widespread use in the packaging industry.
The automotive industry benefits from the strength-to-weight ratio of aluminum sheets to enhance fuel efficiency and vehicle performance. Aluminum sheets are used for body panels, hoods, doors, and structural components, providing a lightweight solution without compromising safety and durability. A popular use for aluminum sheets is in the manufacture of cookware and construction, such as roofing, siding, and gutters.
Aluminum plates are also produced using a rolling process. They are thicker than aluminum sheets and are available in different thicknesses depending on the gauge and grade of aluminum. The thicknesses of aluminum plates gives them greater strength and rigidity, making them suitable for heavy-duty applications.
The properties of aluminum plates makes them ideal for use in the transportation, aerospace, aircraft, marine, and military industries as structural supports, body panels, wings, and fuselage sections. Their strength-to-weight ratio contributes to fuel efficiency and performance. The corrosion resistance and durability of aluminum plates makes them suitable for demanding environments such as storage tanks, fuel tanks, railcars, trailers, and truck beds.
Aluminum wires are manufactured using a process called wire drawing, which involves pulling aluminum ingots through a die to reduce the diameter of the ingot while increasing its length. The electrical conductivity and strength-to-weight ratio of aluminum wire makes it useful as an alternative to copper in some electrical applications. The downside to using aluminum wire for electrical applications is its tendency to easily become oxidized, resulting in the deterioration of the wiring and becoming a potential fire hazard.
Precautions are available to mitigate the risks associated with aluminum wire oxidation. A common approach is using aluminum alloy wires that are designed to improve aluminum’s resistance to oxidation and enhance its overall performance. Aluminum alloys have improved corrosion resistance and a longer lifespan compared to pure aluminum wires.
As with all forms of wiring, the selection of the correct installation is critical to the successful use of aluminum wire. This includes using connectors specially designed for aluminum wires along with insulation for protection against moisture and environmental factors.
Brazing is a metal joining process where the base metal is joined by heating aluminum brazing rods or fillers. When the aluminum reaches its melting point, it is used to attach metal pieces or fill cracks, holes, and gaps. Brazing has become popular due to its exceptional strength and resistance to destruction.
Four forms of brazing are torch, dip, fluxless vacuum, and furnace. With torch brazing, a propane or gas torch is used to heat the metal. In dip brazing, the fill metal is poured around the area to be joined and dipped in a bath. With fluxless vacuum brazing, flux from the brazing process is removed with water or a chemical bath. Finally, furnace brazing involves placing the metals in a furnace. It is a process that has to be closely monitored.
Brazing creates strong, solid joints at lower temperatures than those used for welding. The base metal in the process remains unchanged and keeps its base properties. Brazing makes it possible to easily join dissimilar metals, leaving a smooth and aesthetically appealing surface. In manufacturing processes, brazing is fully automated and takes less time than welding.
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