As you can see in the photo above, steel rebar is simply steel that is melted into the shape of long tubes. The term “rebar” is short for reinforcing bar and is used in concrete to increase it’s tensile strength. Rebar is typically constructed with high yield steel by heating it to its liquid form and then shaping the tubes to spec. Steel rebar can last up to 80 years before it starts to decompose. This makes building with concrete much more stabile and long lasting.