High specific strength and specific modulus
The elastic modulus of the material are the basic parameters for determining the structural dimension. Because there is little difference in elastic modulus and density fir various aluminum alloys, adding a small amount of alloying elements which increases the yield strength in a certain range and makes it easier to reduce the structural weight of ships. Generally the density of Chinese aluminium profile supplier
is about 3.4 ~ 1.9 / cm3, with the elastic modulus about 81 ~ 88GPa. However, high-strength aluminum alloy is usually difficult to equip both good corrosion resistance and weldability. So medium-strength and corrosion-resistant weldable aluminum alloy is often used in aluminum alloy ships.
Excellent welding performance
Welded connections has taken the place of riveting connection for its obvious advantages and it is now widely used in shipbuilding. The current construction of aluminum ships by aluminum profile suppliers mainly use automatic argon method. Aluminum alloy has good weld ability means that the formation of aluminum alloy welding cracks tend to be small. Because the performance caused by welding cannot be revived through re-heat treatment when building ships, so this is one of the important features different from other marine aluminum alloy structure. Therefore, these two alloys are limited in their use as welding ship materials . AL-Zn-Mg alloy is mainly used as heat-treatable components after welding (such as torpedo shell), AL-Mg-Si alloy is mainly used for aluminum profile.
excellent corrosion resistance
Ship structure is often used in the harsh media and marine environments, so whether it has corrosion resistance of aluminum alloy is one of the main signs of marine aluminum alloy. Generally, marine aluminum alloy matrix and welded joints tend no to be stress corrosion. Try to avoid contact corrosion, crevice corrosion and sea corrosion of bio fouling and allow a smaller uniform corrosion and points corrosion.