Steel is a term used for a number of alloys of iron and carbon with differing physical properties. While the density of steel varies depending on the alloys used to create it, its value is commonly found to be between 7,750 and 8,050 kg/m³.
The density of a material is the ratio of a material's mass to its volume. Steel densities vary as a result of different production standards, and higher quality steel is generally of a higher density than lower quality steel. Common steel is composed mostly of carbon and iron, but usually also contains manganese and other elements. These elements tend to be less dense than steel, and their addition lowers the overall density of the alloy. Stainless steel is the most dense common alloy at 8000 kg/m3.