Patent ID: 8858867

Claim:
A ladle metallurgy furnace comprising: a. a ladle in the form of a vessel for containing a molten material, said ladle having an open top, b. a ladle metallurgy furnace roof positioned over the open top of the ladle; wherein the ladle metallurgy furnace roof includes: i. an internal surface structure having a substantially smooth exterior surface; ii. an external surface structure spaced apart from said internal surface structure; iii. a series of coolant channels formed intermediate the internal surface structure and the external surface structure; and iv. an electrode opening; and c. electrodes extending through the ladle metallurgy furnace roof opening and being received in the ladle, wherein the internal surface structure comprises a plurality of metal plates adjoined in direct contact at an interior side to form the substantially smooth exterior surface, wherein at least two of the plurality of metal plates are adjoined in direct metal-to-metal contact at least by a weld between the at least two of the plurality of metal plates at an interior side of the at least two of the plurality of metal plates, and wherein the at least two of the plurality of metal plates each defines a portion of multiple adjacent coolant channels.