Thermophysical law of cooling of forgings in a thermos

Conditions of heat transfer and the law of cooling of forgings in thermoses are considered. (Thermoses are heat-insulated boxes that are beginning to be used at metallurgical plants for slower cooling of forgings after furnace anti-flake annealing to reduce the duration of the latter.) Heat transfer coefficient is calculated in two versions: without and with allowance for heat conduction through the metal of the cross-tie wall, between which lies insulation. It was found that this heat conduction increases the heat transfer coefficient from the surface of forgings αeff by a factor of three. Based on cooling curves of forgings and established law of cooling the experimental value of αeff was found, which proved to be very close to the calculated one. These results will be used to develop the technology of anti-flake treatment of forgings in thermoses at JSC «Urals Stampings».