The specific gravity of aluminum is lighter, resulting in less rebound during forming.
It has a relatively high strength, comparable to or greater than that of high-quality steel.
Aluminum has good plasticity, facilitating the formation of complex products.
It is easier to work with than stainless steel and has excellent electrical conductivity, thermal conductivity and corrosion resistance.
At present, aluminum surface treatment processes such as anodic oxidation and brushing, sandblasting are well developed, and aluminum is widely used in mobile phones.
Aluminum alloy can be divided into two types based on the processing method: deformed aluminum alloy and cast aluminum alloy. In addition, aluminum and aluminum alloy series are mainly divided into eight series.
League class representation
International mark (using four Arabic numerals, now commonly used):
- 1XXX indicates that it is more than 99% pure aluminum series, such as 1050 and 1100.
- 2XXX indicates that it is an aluminum-copper alloy series like 2014.
- 3XXX indicates that it is an aluminum-manganese alloy series such as 3003.
- 4XXX indicates that it is an aluminum-silicon alloy series such as 4032.
- 5XXX indicates that it is an aluminum-magnesium alloy series such as 5052.
- 6XXX indicates that it is an aluminum-magnesium-silicon alloy series, such as 6061, 6063.
- 7XXX indicates that it is an aluminum-zinc alloy series such as 7001.
- 8XXX indicates that this is a different alloy system than the one mentioned above.
8 Series aluminum and aluminum alloy
1XXX Series
According to the processing method, aluminum alloy can be divided into deformed aluminum alloy and cast aluminum alloy, and the serial number of aluminum and aluminum alloy is mainly divided into eight series.
Among these series, the 1000 series has the highest aluminum content, with purity greater than 99.00%. The last two digits of the 1000 series aluminum plate determine the minimum aluminum content of the series. For example, the last two digits of the 1050 series are 50, which means the aluminum content must be at least 99.5% to meet international brand naming standards.
Primary aluminum has good formability and surface treatment properties, with excellent corrosion resistance. However, its strength decreases as its purity increases.
| League system | League number | Summary of material properties | |
| JIS | AA | ||
| 1000 Series | 1060 | 1060 | As a conductive material, IACS guarantees 61% and 6061 is used when resistance is required |
| 1085 1080 1070 1050 1030 |
1085 1080 1070 1050 |
It has good formability and surface treatment. Among aluminum alloys, its corrosion resistance is the best because it is pure aluminum with low resistance. The higher the purity, the lower the resistance. | |
| 1100 1200 |
1100 1200 |
General-purpose aluminum with Al purity greater than 99.0% turns slightly white after anodizing, which is the same as above. | |
| 1000 | The strength is slightly higher than 1100, the formability is good, and its chemical properties are equal to 1100. | ||
The ones commonly used in mobile phones are 1050, 1070, 1080, 1085, 1100, do simple extrusion molding (without bending), of which 1050 and 1100 can do chemical sand, bright, haze, normal effect, with material lines obvious and good coloring effect; 1080 and 1085 specular aluminum is often used to make bright words, fog effect and no obvious material lines.
The first series of aluminum is relatively soft and is mainly used for decoration or interior decoration.
2 XXX Series
It is characterized by high hardness but low corrosion resistance, among which the copper content is the highest.
2000 series aluminum alloy represents 2024, 2A16, 2A02.
The copper content of 2000 series aluminum foil is about 3% to 5%.
2000 series aluminum bars belong to aviation aluminum materials, which are used as structural materials, but are currently not frequently used in conventional industries.
| League system | League number | Summary of material properties | |
| JIS | AA | ||
| 2000 Series | 2011 | 2011 | Fast cutting alloy, good machinability and high strength. But corrosion resistance is low. When corrosion resistance is required, 6062 series alloy should be used |
| 2014 2017 2024 |
2014 2017 2024 |
Containing a large amount of Cu, the corrosion resistance is low, but the strength is high, so it can be used in construction materials. Forged products can also be used. | |
| 2117 | 2117 | After solid solution heat treatment, it is used as hinge nail material, which is an alloy to delay the aging rate at room temperature. | |
| 2018 2218 |
2018 2218 |
Alloy for forging. Good forging property and high temperature resistance, so | |
| Used for forged parts that require heat resistance. Poor corrosion resistance. | |||
| 2618 | 2618 | Alloy for forging. High temperature resistance is superior, but corrosion resistance is low. | |
| 2219 | 2219 | High strength and high temperature characteristics, excellent solubility, but low corrosion resistance. | |
| 2025 | 2025 | Alloy for forging. Good forging property and high strength, but low corrosion resistance. | |
| 2001 | – | Alloy for forging. It has heat resistance and high strength, but corrosion resistance is not good | |
3 XXX Series
3000 series aluminum bars are mainly composed of manganese.
Representatives of the 3000 series aluminum alloy are based on 3003, 3105, 3A21.
The manganese content is between 1.0% and 1.5%, which is a series with good anti-rust function.
It is often used as grooves and tanks for liquid products, construction parts, construction tools, all kinds of lamp parts, and various pressure vessels and pipes for sheet metal processing.
Good formability, solubility and corrosion resistance.
| League system | League number | Summary of material properties | |
| JIS | AA | ||
| 3000 Series | 3003 3203 |
3003 3203 |
The strength is about 10% higher than 1100, and the formability, solubility and corrosion resistance are good. |
| 3004 3104 |
3004 3104 |
Higher strength than 3003, superior formability and good corrosion resistance. | |
| 3005 | 3005 | The strength is about 20% higher than that of 3003 and the corrosion resistance is also better. | |
| 3105 | 3105 | The resistance is slightly higher than 3003 and other characteristics are similar to 3003. | |
4 XXX Series
Normally the silicon content is between 4.5% and 6.0%, the higher the silicon content, the greater the resistance.
4000 series aluminum bars represent 4A01, and 4000 series aluminum plates belong to the high silicon series.
Lower solidification shrinkage, belonging to construction materials, mechanical parts, forging materials, welding materials;
Low melting point, good corrosion resistance, heat resistance and wear resistance.
| League system | League number | Summary of material properties | |
| JIS | AA | ||
| 4000 Series | 4032 | 4032 | Good heat resistance, abrasion resistance and low coefficient of thermal expansion. |
| 4043 | 4043 | Lower solidification shrinkage, treated with sulfuric acid anodizing, presenting a natural gray color. | |
5 XXX Series
5000 series aluminum bar belongs to the most commonly used aluminum alloy plate series, the main element is magnesium, the magnesium content is between 3-5%.
5000 series aluminum alloy represents 5052, 5005, 5083, 5A05 series.
It can also be called aluminum-magnesium alloy.
The main characteristics are low density, high tensile strength and high elongation.
In the same area, the weight of Al-mg alloy is lower than other series, so it is widely used in conventional industry.
| League system | League number | Summary of material properties | |
| JIS | AA | ||
| 5000 Series | 5005 | 5005 5050 |
The resistance is the same as 3003, with good processability, solubility and corrosion resistance. The modification processing after anodizing is good, which is compatible with the color of the 6063 format material. |
| 5052 | 5052 | It is the most representative alloy with medium strength, good corrosion resistance, solubility and formability, especially high fatigue resistance and good seawater resistance. | |
| 5652 | 5652 | The alloy that limits the impure elements of 5052 and inhibits the separation of hydrogen peroxide. Other properties are the same as 5052 | |
| 5154 | 5154 | The resistance is about 20% higher than 5052 and other characteristics are the same as 5052 | |
| 5254 | 5254 | The alloy that limits 5154's impure elements and inhibits the decomposition of hydrogen peroxide has the same properties as 5154. | |
| 5454 | 5454 | The strength is about 20% higher than that of 5052, and its characteristics are approximately the same as 5154, but its corrosion resistance in aggressive environments is better than that of 5154. | |
| 5056 | 5056 | Excellent corrosion resistance, cutting and working surface modification, good anodizing and dyeing. | |
| 5082 | 5082 | The strength is similar to 5083, and the formability and corrosion resistance are good. | |
| 5182 | 5182 | The resistance is about 5% higher than 5082 and other characteristics are the same as 5082. | |
| 5083 | 5083 | Alloy for fusion construction. It is the highest strength corrosion-resistant alloy in practical non-heat-treated alloys and is suitable for solution bond structures. Good seawater resistance and low temperature characteristics | |
| 5086 | 5086 | The strength is higher than that of 5154. It is a fusion structure alloy without heat treatment with good resistance to sea water. | |
| 5001 | – | The toughness is the same as 3003, and the anodizing treatment after bright treatment can have high gloss. | |
| 5002 | Alloy for hinge nail, good resistance to sea water | ||
The most commonly used in mobile phones is 5052, which is the most representative alloy with medium strength, good corrosion resistance, solubility and formability, especially high fatigue resistance, good seawater resistance, and is often used to make products with high resistance.
But its coloring effect is not ideal, so it is suitable for sandblasting processes, not suitable for chemical sandblasting, haze surface, etc., mainly using casting molding, not suitable for extrusion molding.
6 XXX Series
The 6000 series aluminum alloy represents 6061, which mainly contains magnesium and silicon, so it integrates the advantages of the 4000 and 5000 series.
6061 is a cold-treated aluminum forged product suitable for applications requiring high corrosion resistance and oxidation resistance.
Good usability, easy coating and good processability.
| League system | League number | Summary of material properties | |
| JIS | AA | ||
| 6000 Series | 6061 | 6061 | Heat treated corrosion resistant alloy. T6 treatment can have very high strength value, but the fusion interface strength is low, so it is used for screws and hinge screws |
| 6001 | The medium strength extrusion alloy has an average strength of 6061 and 6063. It has good extrusion, stamping and quenching properties. It can be used as large and thin meat-shaped materials with complex shapes. It has good corrosion resistance and fusion joint. | ||
| 6063 | 6063 | The representative extrusion alloy has strength lower than 6061 and good extrusability. It can be used as formwork material with complex section shape, with good corrosion resistance and surface treatment | |
| 6101 | 6101 | High resistance conductive material. 55% ACS guarantee | |
| 6151 | 6151 | It has excellent forging processability, corrosion resistance and surface treatment. It is suitable for complex forging products. | |
| 6262 | The corrosion resistance fast cutting alloy has better corrosion resistance and surface treatment than 2011, and its strength is the same as 6061. | ||
6061 and 6063 are mainly used in cell phones.
The strength of 6061 is greater than that of 6063.
Casting molding can cast more complex structures and can be used as fitting parts such as battery cover, etc.
7 XXX Series
It mainly contains zinc and the 7000 series aluminum alloy represents 7075.
It also belongs to the Aviation series.
It is an alloy of aluminum, magnesium, zinc and copper, heat treatable alloy, super hard aluminum alloy and has good wear resistance.
| League system | League number | Summary of material properties | |
| JIS | AA | ||
| 7000 Series | 7072 | 7072 | The electrode potential is low. It is mainly used for leather materials with anti-corrosion coating. |
| 7075 | 7075 | One of the aluminum alloys with the highest strength, but corrosion resistance is low. Coating material with 7072 can improve its corrosion resistance, but the cost increases. | |
| 7050 | 7050 | The enhanced hardening property alloy of 7075 has good resistance to stress corrosion cracking. It is suitable for thick plates and forged products | |
| 7001 | The alloy for welding structure has high strength, and the strength of the welding part can return to the strength close to that of the base metal when placed at room temperature. | ||
| 7003 | 7003 | The fusion structure extrusion alloy has slightly lower strength than 7N01, but has good extrusability. It can be used as a large format material with thin meat. | |
8 XXX Series
8011 is commonly used in 8000 series aluminum alloys, which belong to other series.
Most applications are aluminum sheets, which are not commonly used in the production of aluminum bars.
