Answer:
Steel is an alloy, and it is made from the elements iron and carbon (the percentage of carbon is very low, varying from about 0.25% to 2%). There are other things we can add to the steel to change its properties, in order to suit different applications, and some are:
Chromium - improves durability and prevents rust (stainless steel).
Nickel - increases durability and resistance to heat and acids.
Manganese - increases strength and resistance to wear.
Molybdenum - increases strength and resistance to heat.
Tungsten - retains hardness at high temperatures.
Vanadium - increases strength and springiness.