Heavy cruisers are large surface ships that are second only to battleships and battlecruisers in terms of displacement, firepower, armor protection, etc. The cruisers have the ability to deal with multiple operational targets at the same time. Historically, cruisers originally meant warships that could operate independently, while destroyers in contrast needed the help of other ships (such as supply ships). But in modern times this distinction has disappeared.
As a product of the naval treaty, although heavy cruisers are equipped with 203mm main guns that can effectively attack the enemy's small and medium-sized warships, their protection ability is difficult to resist even 150mm class naval guns. Therefore, although these warships can effectively attack the enemy's small and medium-sized warships, they are quite vulnerable to the attack of the enemy's main ships and cruisers.