aluminum grades series 1xxx

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Aluminum Grades Series 1xxx

These grades of aluminum (1050, 1060, 1100, 1145, 1200, 1230, 1350 etc.) are characterized byexcellent corrosion resistance, high thermal and electrical conductivities, lowmechanicalproperties, and excellent workability. Moderate increases in strength may beobtained by strain hardening. Iron and silicon are the major impurities.


These aluminum alloys (2011, 2014, 2017, 2018, 2124, 2219, 2319, 201.0; 203.0; 206.0; 224.0;242.0 etc.) require solution heat treatment to obtain optimum properties; in the solution heat-treated condition, mechanical properties are similar to, and sometimes exceed, those of low-carbon steel. In some instances, precipitation heat treatment (aging) is employed to furtherincrease mechanical properties. This treatment increases yield strength, with attendant loss in

elongation; its effect on tensile strength is not as great.The aluminum alloys in the 2xxx series do not have as good corrosion resistance as most otheraluminum alloys, and under certain conditions they may be subject to intergranular corrosion.Aluminum grades in the 2xxx series are good for parts requiring good strength at temperaturesup to 150C (300F). Except for the grade 2219, these aluminum alloys have limited weldability,but some alloys in this series have superior machinability. Aluminum grade 2024 is the mostpopular alloy and is commonly used in aircraft construction.


These aluminum alloys (3003, 3004, 3105, 383.0; 385.0; A360; 390.0) generally are non-heattreatable but have about 20% more strength than 1xxx series aluminum alloys. Because only alimited percentage of manganese (up to about 1.5%) can be effectively added to aluminum,manganese is used as major element in only a few alloys.


The major alloying element in 4xxx series alloys (4032, 4043, 4145, 4643 etc.) is silicon, whichcan be added in sufficient quantities (up to 12%) to cause substantial lowering of the meltingrange. For this reason, aluminum-silicon alloys are used in welding wire and as brazing alloys forjoining aluminum, where a lower melting range than that of the base metal is required. Thealuminum alloys containing appreciable amounts of silicon become dark gray to charcoal whenanodic oxide finishes are applied and hence are in demand for architectural applications.


The major alloying element is magnesium; when it is used as a major alloying element or withmanganese, the result is a moderate-to-high-strength work-hardenable alloy. Magnesium isconsiderably more effective than manganese as a hardener about 0.8% Mg being equal to 1.25%
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Mn and it can be added in considerably higher quantities. Aluminum alloys in this series (5005,5052, 5083, 5086, etc.) possess good welding characteristics and relatively good resistance tocorrosion in marine atmospheres. However, limitations should be placed on the amount of coldwork and the operating temperatures (150F) permissible for the higher-magnesium aluminumalloys to avoid susceptibility to stress-corrosion cracking.


Aluminum alloys in the 6xxx series (6061, 6063) contain silicon and magnesium approximately inthe proportions required for formation of magnesium silicide (Mg2Si), thus making them heattreatable. Although not as strong as most 2xxx and 7xxx alloys, 6xxx series aluminum alloys havegood formability, weldability, machinability, and relatively good corrosion resistance, withmedium strength. Aluminum grades in this heat-treatable group may be formed in the T4temper (solution heat treated but not precipitation heat treated) and strengthened afterforming to full T6 properties by precipitation heat treatment.


Zinc, in amounts of 1 to 8% is the major alloying element in 7xxx series aluminum alloys (7075,7050, 7049, 710.0; 711.0 etc.), and when coupled with a smaller percentage of magnesiumresults in heat-treatable alloys of moderate to very high strength. Usually other elements, suchascopperand chromium, are also added in small quantities. 7xxx series alloys are used inairframe structures, mobile equipment, and other highly stressed parts. Higher strength 7xxxaluminum alloys exhibit reduced resistance to stress corrosion cracking and are often utilized ina slightly overaged temper to provide better combinations of strength, corrosion resistance, andfracture toughness.


The 8xxx series (8006; 8111; 8079; 850.0; 851.0; 852.0) is reserved for alloying elements otherthan those used for series 2xxx to 7xxx. Iron and nickel are used to increase strength withoutsignificant loss in electrical conductivity, and so are useful in such conductor alloys as 8017.Aluminum-lithium alloy 8090, which has exceptionally high strength and stiffness, wasdeveloped for aerospace applications. Aluminum alloys in the 8000 series correspond to UnifiedNumbering System A98XXX etc.


This series is not currently used.
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aluminum grades series 1xxx

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