The speed of sound is quickest in mediums that have their molecules close apart. The speed of sounds is quickest in solids, followed by liquids, and slowest in gasses. The close the molecules are together, the quicker sound travels. The sound would travel faster in the steel than in the air.
This is due to the fact that sound waves are compression waves. This means that they rely on the way molecules collide with one another and act sort of like a spring.
Fun fact: In the old days, people used to put their ears to the train tracks to see if a train is coming. Sound moves so fast in metal that they can sense the vibrations miles before the train arrived.
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