Is it possible to melt tin, aluminum, cast iron in a copper vessel?

The melting point of copper (Cu) is 1085 degrees, for tin (Sn) 232 degrees, for aluminum (Al) 660 degrees. The melting temperature of cast iron ranges from 1150 to 1200 degrees. Your copper vessel itself will melt earlier —> so no, you won’t be able to melt it. But you can do aluminum and tin, since their melting points are much lower than that of copper (Cu) .—-> so yes, you can melt it.