1.   Graphite electrodes are rods used in what are known as electric arc furnaces, which help melt scrap steel.

2.   He made no move, believing his walled-off house was out of reach of the volcanic stream hot enough to melt steel.

3.   Minimills are small operations that specialize in melting scrap steel and recasting it.

4.   Nine electrodes, joined in columns of three each, are used in the average electric arc furnace to melt scrap steel.