Was Mercury the first superconductor?

No.

http://www.jiskha.com/display.cgi?id=1161728962

see what happened in 1962

Thanks for your answer. Would you please let me know if steel is a superconductor?

never mind, it is not.

No, steel is not a superconductor.

To find out whether steel is a superconductor, one can search for reliable sources such as scientific articles, research papers, or reputable educational websites. These sources often contain information about the properties of different materials, including whether they exhibit superconductivity. It is also helpful to understand the basic characteristics of superconductors, such as the ability to conduct electricity with zero electrical resistance below a certain critical temperature.

In the case of steel, it is a well-known fact that it is not a superconductor. Steel is primarily composed of iron with small amounts of carbon and other elements. While iron itself can exhibit magnetic properties, it does not possess the ability to superconduct. Therefore, steel, being an alloy of iron, also does not display superconductivity.

It is always recommended to consult verified sources or experts in the field to confirm information about the properties of specific materials.