20century60Before the era, tanks were mostly classified into light, medium, and heavy types based on their combat weight, artillery caliber, and purpose. Usually heavy tanks are heavy42～80Ton, the maximum caliber of the artillery is152Millimeters are mainly used to support medium tank combat. Its characteristics are large caliber artillery, long barrel, and strong attack power. Because the large caliber of tank artillery means greater attack power. The caliber of heavy tank artillery includes88millimeter90millimeter100millimeter105millimeter120millimeter122millimeter128millimeter130millimeter150Millimeters and even152Millimeters. Meanwhile, heavy tanks have thick armor and strong resistance to artillery fire, but their heavy weight results in slower speeds. Heavy tanks have a huge appearance and astonishing weight, making them the backbone of armored units. Heavy armor and powerful artillery enable each heavy tank to have the ability to operate independently.