The resonant frequency of steel can vary depending on factors such as the specific type of steel, its shape, size, and the conditions under which it is being measured. Generally, the resonant frequency of steel falls within a range of frequencies known as the ultrasonic frequency range, typically between 1 to 10 MHz (megahertz).
However, it's important to note that resonant frequencies can be specific to individual objects or structures made of steel, and are influenced by their dimensions and structural properties. For example, a steel beam or a steel plate will have different resonant frequencies due to their differing shapes and sizes.
Resonant frequencies are determined by the material's stiffness and density. The resonant frequency represents the natural vibration frequency at which an object or material vibrates most efficiently or with the greatest amplitude.
If you have a specific steel object or structure in mind, providing more details about its dimensions or purpose might allow for a more precise estimation of its resonant frequency.