UR Steel is a steel mill in New York once haunted by a ghost.
UR Steel's mill was haunted by a ghost and hired the Ghostbusters to catch it. However, the ghost was electrolyzed by the Proton Streams and fused with molten steel. The mill was unaware of this and sold the new metal. Once the Ghostbusters realized what happened and gathered all the metal parts, they returned to UR Steel. They melted down the metal and the ghost emerged from the vat. The Ghostbusters then successfully trapped it.