Tin, the malleable metal represented on the periodic table of elements with the symbol Sn, has a material IACS % conductivity of 15%. This means that the conductivity of tin is 15% that of copper. Although tin is a terrible electrical conductor in its natural state, it can become what is known as a superconductor--an element which will conduct electricity without resistance--when cooled to a temperature below -452.704 ºF.
Lead is another malleable metal, represented on the periodic table with the symbol Pb. It has a material IACS % conductivity of 7%, giving it 7% of the conductivity of copper. Like tin, lead becomes a superconductor when cooled to -446.44 ºF.
Steel is an alloy made up largely of iron, and has been produced for thousands of years. It has a material IACS % conductivity rating of 3% to 15%, meaning its electrical conductivity properties are anywhere from 3% to 15% of copper. Steel is also a poor thermal conductor, a common trait of metals which are poor electrical conductors.