Like all the 5000-series high magnesium alloys 5083 achieves a high strength by cold working, enabling a series of “H” tempers; 5083 aluminium alloy sheet plate is the highest strength of any of these alloys.Alloy 5083 is best known as a plate for ship building.Alloy 5083 is a non-heat-treatable 4?% magnesium, 0.15% chromium, 0.7% manganese alloy commonly available in flat rolled plate from a range of producing mills.
The alloy is also produced as extruded seamless tube and other extrusions and as forgings; these are available on indent from Atlas.Corrosion Resistance of 5083 aluminium alloy sheet plateExcellent in a wide range of atmospheric environments, in food processing and architectural applications. The principal application for 5083 is marine environments.
The magnesium content is more than 3?% Mg, so this alloy can be susceptible to stress corrosion cracking, which limits its application temperature to below 65°C and also limits the amount of cold work to ? Hard.Special intergranular corrosion and exfoliation corrosion tests are carried out to certify 5083 for marine applications – refer to the later section on B928 and classification society rules.
Heat Treatment for 5083 aluminium alloy sheet plateAlloy 5083 is not hardenable by heat treatment. It can be significantly hardened by cold work (eg by cold rolling) and various “H” tempers are produced – most commonly H32 (? Hard) or the similar strength marine tempers H116 and H321 – as well as the soft annealed Temper O condition.The aluminium alloy sheet spontaneously age-softens at room temperature immediately after cold work but will eventually reach a stable condition; all flat rolled mill products are supplied with stable properties.
This is usually achieved by a stabilisation thermal treatment as the last operation which results in the H32 or H321 tempers. H112 temper is strain hardened as the final operation, again to quickly reach the required stable temper properties.Typical Applications of 5083 aluminum alloy sheet platePlate for ship building, unfired welded pressurevessels, rail and otherstructural applications thathigh strength.