Youngs Modulus and Yield Strength

Property Alloy 5083 Hll Non-alloyed steel Stainless steel Z7CN18-09, annealed 

The decrease in the mechanical strength of aluminium leads to a reduction in its load-bearing capacity if the structure that is exposed to heat is under load. As in the case of steel, it is necessary to provide adequate thermal insulation in compliance with applicable regulations, in order to guarantee the long-term mechanical integrity of loaded structures in case of fire. 

This applies especially to fireguard walls made of aluminium, which need to be protected, as in the case of steel or any other metal, in order to resist a fire for a given period of time. 

After prolonged heating of age-hardenable aluminium alloys (series 2000, 6000 and 7000), their mechanical characteristics should be checked to see that they have not been altered as a consequence of heating. 

Since aluminium has a good thermal conductivity, heat is dissipated more rapidly than with other metals. This avoids hot spots. Heat diffusion is accompanied by deformation, because of aluminium s high linear expansion coefficient. 

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