When a tank unit is engaged in combat, the quality of armor steel can have a significant impact on the success of the battle. Chromium, nickel, manganese and molybdenum are metals that increase the hardness of armor. Shafts, gears and tracks are important parts of tanks, which contain vanadium, tungsten, molybdenum and niobium. - the tank's camouflage is made of chromium with lead added; The polarizing glass used on the tank was made of a special boron glass and iodine compound, which allowed the tank hand to see the enemy without the interference of the enemy's strong searchlights. The secondary parts of the tank are made of duralumin and silicaluminum-sensitive; Higher-quality gasoline, kerosene, light petroleum and the best lubricants made from petroleum have a great effect on tank performance and speed, while bromine compounds can promote fuel combustion and reduce engine noise to a certain extent.