Melter

Bruno Horgan wasn't much of a threat. Facing bankruptcy due to an inspection revealing his use of faulty materials, Horgan blamed competetor Tony Stark for his failure. Discovering one of his devices could emit a beam that melted iron, Horgan redesigned it to fit on his chest, and became the Melter, beating Iron Man in their first confrontation. But in their second battle, Iron Man, wearing a duplicate armor of aluminum, defeated Melter with ease. Even after reworking his weapon to melt other materials and redesigning his suit numerous times, the Melter could never defeat Iron Man, and was killed by the vigilante terrorist organization, the Scourge of the Underworld.

Powers
Horgan's ray could melt any material known to man.