The most common aluminum plate used in various industries is 6061 aluminum plate. This alloy offers a good balance of strength, weldability, and corrosion resistance, making it suitable for a wide range of applications. It is commonly used in aerospace, automotive, marine, and structural applications due to its excellent mechanical properties and versatility. Additionally, 6061 aluminum plate can be easily machined, welded, and formed, further contributing to its widespread use across different industries.