The main element of 5056 is magnesium. Magnesium can significantly increase the strength of aluminum without excessively reducing its plasticity. Aluminum-magnesium alloy has good corrosion resistance and weldability.
High Formability 5056 Aluminum Plate Marine Grade  also contains a small amount of manganese and chromium. The addition of manganese can improve the corrosion resistance of the alloy, especially the ability to resist stress corrosion cracking, and can ensure that the alloy has higher stability. The effect of adding chromium is similar to that of manganese, which can improve the resistance to stress corrosion Carlyle, increase the strength of the body metal and the weld seam, and reduce the tendency of welding cracks.