Aluminum alloy codeInitially, every aluminum company in the world has a different aluminum alloy code. Then, in October 1954, American Aluminum Association implement a unified aluminum alloy code by using AA code followed by four digits numbers representing the alloy composition. The first digit represents the alloy series:
1XXX stands for pure aluminum series,
2XXX stands for Aluminum-Copper alloy series,
3XXX stand for Aluminum-Manganese alloy series,
4XXX stand for Aluminum-Silicon alloy,
5XXX stands for Aluminum-Magnesium alloy series,
6XXX stands for Aluminum-Magnesium-silicon alloy series,
7XXX stands for Aluminum-Zinc Alloy Series
But since the earlier development in Europe, many countries such as Germany, France, Britain, Switzerland, Italy and other countries continue using their own aluminum alloy code.
The same types of aluminium alloy may have a different code due to the treating of aluminum after it is milled, sometimes called temper, designated by a letter after the four digit number. Each letter signifies exactly how the aluminum was treated. Not all treating is heat treating and not all treating effects temper.
F as fabricated, W solution heat-treated, O Annealed, H Strain Hardening, T Thermally treated which is divided into a variety degrees of cold processing and heat treatment conditions:
Cold processing: H12, H14, H16, H18, H22, H24, H26, H28, H32, H34, H36, H38
Heat treatment conditions: T1, T2, T3, T4, T5, T6, T7, T8, T9, T10,…
First, Represent the four-digit number of the aluminum alloy component. Second, represent the treating method by using English alphabet and number, for example, AA5052-H32, AA6063-T5.
The four-digit number representing the aluminum alloy component is sometimes followed by a letter representing the manufacturing type, for example, “P” representing the plate or “S” representing the shape of the extruded product
Therefore, the above alloy code can also be expressed as AA5052P-H32, AA6063S-T5, etc.
1000 series is mostly used in aluminium industry. 1100 and 1200, both contain more than 99% of pure aluminium. By adding Cu to the 1100 alloy will make It more glossy after anodic oxidation.
Although in the processing, corrosion resistance, welding has excellent performance, this aluminum series has low strength. So, it is suitable for non-required strength of household goods, daily necessities, electrical appliances, and other items, due to good conductivity and heat conduction. 1060, 1070 is widely used in wire, cable, and heat sink.
Such as Dura aluminum(2017), Ultra-pulla aluminum(2024) has a strength as much as steel, but with higher copper. So it has poor corrosion resistance. Not suitable for the corrosive environment and need a careful maintenance. Since the welding performance is poor, using rivets, screws and other are needed for bonding methods.
Aluminum alloy in this series, such as 3003, was added by Mn in order to maintain the pureness of aluminium. So, corrosion resistance and strength are the advantages in this series. It has a wide range of uses In the utensils, building materials, containers, etc.
The addition of Mg 1% to 3003 alloy will make it has a higher strength than 3004 alloy, and mostly used for aluminum wire and lamp cap.
4032 alloy is the addition of Si to suppress its thermal expansion and improve wear resistance, and then add amounts of Cu, Ni, Mg, etc., can improve the heat resistance which can be used as a forging piston.
4043 melting temperature is low, so it can be used for aluminum wire, and because of Si dispersion, 4043 alloy’s anodized film is gray. It is also used for outside building.
Aluminum with small amount of magnesium is mostly used for decoration, artifacts and other materials used.
Aluminum with huge amount of magnesium is mostly used in the construction of timber.
5N01 is the representative of aluminum alloy with less Mg using for decorative materials and advanced objects.
And, 5005 is suitable mostly for vehicle ceilings, building materials and other materials.
5052 aluminum alloy is for a medium strength used material .
5083 contains more Mg, although non-heat treatment alloy, but with high strength, good weldability, is a good for welded structural materials, mostly used in ships, vehicles, chemical plants.
The strength of the aluminum alloy in this series is reduced in cold processing and make it highly flexible. This kind of aluminum does not need to take care of its surface much. So, it is often used in industrial work with high pollution of the sea or air.
In addition, aluminum alloy 5083 contains high Mg. If the temperature change rapidly, or excessive cold work then high temperature has been given, it will produce stress corrosion cracking. So, it usually be used in soft texture materials.
This series of alloy are strength and corrosion resistance is good, typically used for structural materials. The heat affected zone strength significantly reduced after welding. So, using screws, rivets and other things are needed for bonding methods.
Endurance 25 kg / mm 2 of 6061-T6 is equal to SS41 steel. So, It can be used interchangeably with the advantage over the flexibility of bending. It is often used in building or manufacturing crane.
For doors and windows, the strength requirements are low, 6063 has excellent compaction, often used as doors and windows materials.
In this aluminum alloy series, it has the highest strength, can be divided into two kinds:
Al – Zn – Mg – Cu alloy,
and Al – Zn – Mg alloy without Cu, also known as ternary alloy.
The representative of Al – Zn – Mg – Cu alloy is 7075, which is used in aircraft structure and sports equipment.
Al-Zn-Mg has high strength due to its various compounds. And excellent welding capabilities, such as the 7N01 aluminum alloy, are often used in structural work requiring welding, such as railways and others.
Aluminum alloy in this series need to get the process in the proper temperature. Otherwise it will be stress corrosion cracking or easy to corrode. Therefore, it is always necessary to keep a constant temperature control in order to obtain good quality aluminum.