Tanks are very heavy vehicles, and need their tracks to spread their weight on the ground. This helps them travel over soft ground without sinking in too deeply. The metal tank tracks are also less likely to be damaged by gun fire, which would soon puncture pneumatic tyres.
Amy tanks do NOT have chained wheels. Tanks are tread laying machines.
Tanks have interior wheels that drive their treads, which revolve around the outside of the entire set of hub wheels. Light tanks may have road wheels that are fitted underneath, to avoid damaging the surfaces of roadways and bridges.
Stainless Steel :)
The first tanks were constructed of riveted steel. During the Vietnam War, the M48 Patton tanks were built of cast one piece steel. After the war, today's tanks are made of classified synthetics.
Here is a list of suppliers that sell both new and used stainless steel tanks: http://www.thomasnet.com/products/tanks-stainless-steel-83330209-1.html There are several companies that provide cheap stainless steel tanks. The best place to find them online is from aaronequipment.com,they sell both used and new stainless steal tanks.
Most fuel tanks are made of steel or plastic.
Steel tanks are used for fuel containment in large amounts. Most liquids stored in steel tanks are hazardous, combustible and flammable liquids. Steel tanks are often used by chemical facilities, bulk petroleum plants, government agencies, and farming operations.
If you are talking water heater, they are made of steel. If talking storage tanks, copper lasts much longer than steel. Will not rust.
Tanks don't use tyres - they use steel caterpillar tracks.
In Vietnam, US Army/Marine Corps M48 Patton medium tanks were built from solid cast/wielded steel (no rivets and no plates). The brand new M551 Sheridan tanks had aluminum hulls and steel turrets and guns.
Steel has been used as a tank material since the begining of scuba diving. Extremely durable and useful as a tank material but steel rusts. Buy a steel tank, assume that over the life of the tank it will cost you for a few tank tumbles to remove interior rust. Pay more for a steel tank than an aluminum one. Steel will last (almost) forever if you take care of it. There are steel tanks still in service today that were originally manufactured in the 50s. Aluminium tanks came out in the 70s. It's a softer material, the walls of aluminum tanks are thicker, making them a little larger than steel tanks of the same capacity. The big advantage of aluminum is that it doesn't rust and it's less-expensive than steel. You can find aluminum tanks cheap, for $100-150.
Japan is an island empire and depends upon the sea for survival, as does Great Britain. Consequently, Japan & Britain were naval powers. Warships and tanks are made of steel. Japan needed steel to build warships; tanks were 3rd in priority to warships, airplanes (engines are built of steel), artillery & tanks.