Applications by Alloy Class - Wrought Alloys

1xxx—Pure Al. The major characteristics of the 1xxx series are:

• Strain hardenable

• Exceptionally high formability, corrosion resistance, and electrical conductivity

• Typical ultimate tensile strength range: 10–27 ksi (70–185 MPa)

• Readily joined by welding, brazing, and soldering

The 1xxx series represents the commercially pure aluminum, ranging from the baseline 1100 (99.00% minimum Al) to relatively purer 1050/1350 (99.50% minimum Al) and 1175 (99.75% minimum Al). The 1xxx series are strain hardenable but would not be used where strength is a prime consideration.

The primary uses of the 1xxx series include applications where the combination of extremely high corrosion resistance, formability, and/or electrical conductivity are required, e.g., foil and strip for packaging (Fig. 1), chemical equipment, tank car or truck bodies, spun hollowware, and elaborate sheet metal work.

Electrical applications are one major use of the 1xxx series, primarily 1350, which has relatively tight controls on impurities that would lower electrical conductivity. As a result, an electrical conductivity of 62% of the International Annealed Copper Standard (IACS) is guaranteed for this material which, combined with the natural light weight of aluminum, means a significant weight and therefore cost advantage over copper in electrical applications (Fig. 2).

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