Aluminum and aluminum alloys and other general features 
 Compared to other metallic materials of aluminum and aluminum alloy, has the following characteristics: 
 1, the density 
 The density of aluminum and aluminum alloys close to 2.7g / about 1/3 of the iron or copper. 
 2, high strength 
 Aluminum and aluminum alloy high strength. After a certain degree of cold working can enhance the matrix strength, some grades of aluminum alloy can be strengthened by heat treatment. 
 3, good electrical and thermal conductivity 
 Conductive thermal conductivity of aluminum is second only to silver, copper and gold. 
 4, good corrosion resistance 
 The aluminum surface is easy to naturally produce a layer of dense, solid the AL2O3 protection film can be well protected the substrate from corrosion. Obtained through artificial anodizing and coloring, good good casting properties of cast aluminum alloy or processing plastic deformation of aluminum alloy. 
 5, easy processing 
 Certain alloying elements are added, the good get a good casting properties of cast aluminum alloy or processing plastic deformation of aluminum alloy. Due to the excellent physical properties, aluminum has been widely used in various sectors of the national economy and defense industries. Aluminum as a lightweight structural materials, light weight, high strength, sea, land and air a variety of delivery vehicles, especially aircraft, missiles, rockets, artificial Earth satellite, use a lot of aluminum, the amount of a supersonic aircraft aluminum 70% of of its own weight, aluminum accounted for 10% of the total weight of the missile; aluminum and aluminum alloy manufacturing various types of vehicles can reduce energy consumption, the energy they save far more than the aluminum the energy consumption; in the construction industry with aluminum alloy doors and windows and structural materials of the housing; aluminum production of solar energy collection, energy savings; in the area of ??power transmission, the amount of aluminum in the first place, 90 percent of the high-voltage wire is made of aluminum made; in the food industry, from the tank into the cans, as well as aluminum are mostly made of beverage containers; aluminum do refractory metals (such as molybdenum, etc.), reducing agent and do deoxidizer in steelmaking, daily life use pots, plates, spoons, etc. are mostly made of aluminum. 
 International has registered more than 1000 aluminum alloy grades, each grade there are a variety of state, there are obvious differences in hardness, strength, corrosion resistance, machinability, weldability, decorative. Choice of grades and status of the aluminum alloy, the above aspects, difficult to meet, it is not necessary, should be based on the product performance requirements, the use of the environment, process and other factors, to set the priorities of the various performance before they do a reasonable selection in the top of the performance is reasonable under the control costs. 
 Hardness: many customers in the purchase of aluminum is very concerned about the hardness of the preferred alloy chemical composition of a direct relationship. Secondly, the different states a greater impact, can achieve the highest hardness point of view, the 7 Series, 2 Department of Fourth Series, 6 Series, 5 Series, 3 Series, 1 Series, in order to reduce 
 Hardness: the strength of the product design must take into account important factors into its aluminum alloy components as the components should be based on the pressure, select the appropriate alloy. Pure aluminum intensity of at least 2 system and the heat treatment type alloy 7 Series the highest hardness and strength of the phasor relationship. 
 Corrosion resistance: corrosion resistance, chemical corrosion, stress corrosion performance. In general, the best corrosion resistance of pure aluminum 1 series, 5 series performed well, followed by the 3 Series and 6 Series 2 Series and 7 Series poor. The corrosion resistance of selection principles should be based on the use of occasions. High-strength alloys used in corrosive environments, the composite materials must be used for corrosion protection. 
 Processing: the processing performance package insert forming properties and cutting performance. Formability and state in the choice of aluminum alloy grades, the need to consider the scope of the strength of the various states, usually high strength material is not easy to take shape. Taiwan fruit on the aluminum bending, stretching, deep drawing molding, finished the annealed condition the material forming the best, on the contrary, the heat treatment state of the material forming the worst. Aluminum cutting is poor, better machinability of the mold, machinery parts, etc., on the contrary, low-intensity by cutting poor, mold, machinery parts and other products that require cutting, aluminum cutting is an important considerations. 
 Weldability: no problem most welding of aluminum alloys, in particular, is part of the 5-series aluminum alloy, is designed for welding consideration, on opposite sides of words, part 2 and 7 Series aluminum alloy more difficult to weld. 
 Decorative properties: aluminum used in decorative or specific occasions when you need its surface anodizing, painting and other processing to obtain the corresponding color and the surface structure, then the decorative consideration should focus on general rather words, better corrosion resistance of the material, the anode processing performance, surface treatment properties, coating performance is very good. 
 Other Features: In addition to the above characteristics, as well as electrical conductivity, wear resistance, heat resistance and so on. Also be considered in the selection. 

 Pure aluminum: 1A99 1A97 1A95 1A93 1A90 1A85 1A80 1A80A 1070 1070A 1370 A1060 1050 1050A 1A50 1350 1145 1350 1A30 1160 1200 1235 
 Series 2: 2A01 2A02 2A04 2A06 2A10 2A11 2B11 2A12 2A13 2A14 2A16 2B16 2A17 2A20 2A21 2A25 2A49 2A50 2A70 2A80 2A90 2004 2011 2014 2014 A, 2 214 2017 2017A 2 177 2218 2618 2219 2024 2 124 
 Series 3: 3A21 3003 3103 3004 3005 3105 
 Series 4: 4A03 4A11 4A13 4A17 4004 4032 4 043 4 043 A, 4 047 4047A 
 Series 5: 5A01 5A02 5A03 5A05 5A06 5B06 5A12 5A30 5A33 5A41 5A42 5A66 5005 5019 5050 5251 5052 5 154 5154A 5454 5154A 5 754 5056 5 356 5456 5 082 5182 5086 
 Series 6:, 6A02 6B02 6A51 6101 6101A 6005 6005A 6351 6060 6061 6063 6063A 6070 6181 6082 
 Series 7: 7A01 7A03 7A04 7A05 7A09 7A10 7A15 7A19 7A31 7A33 7A52 7003 7005 7020 7022 7050 7075 7475 8A06 80.11809 million