Abstract: A bell type annealing furnace structure that includes a base which has a base plate member and an annular channel therearound. A plurality of circumferentially spaced enclosure members are provided, each having a coil support section with support legs depending therefrom supporting the enclosure member on the base plate member and defining a space between the base plate member and the coil support section. The enclosure members are configured to form a central annular opening, and joints interconnect each of the enclosure members. Each joint includes a web member extending between the adjacent enclosure members and is curved toward the base plate member. Reinforcing segments are disposed in the spaces between and engaging both the base plate member and the coil support section. A cap member is disposed in the annular opening defined by the enclosure members, and includes an upper section and an annular leg depending therefrom engaging the base plate member.

Abstract: Apparatus and process are disclosed whereby open coils having spaces between the convolutions may be treated in a longitudinally extending furnace by passage of treating gases between the convolutions of the coils, the coils being introduced at one end of the furnace, passed through the furnace while being treated, and removed from the other end of the furnace. Walking beam apparatus is disclosed having sealing means, disclosed as a trough and flange sealing means that prevents gas leakage between the lower portion of the walking beam apparatus and the atmosphere, so that a completely gas sealed enclosure may be provided above the walking beams. Transfer means are disclosed at the entrance and discharge ends of the furnace, for introducing coils into the furnace and removing them from the furnace through purge chambers. A coil support that travels with the coil through the furnace is disclosed. Processes are also disclosed for continuously treating open coils.