本文介绍了上大下小模用绝热板保温帽浇注重轨钢的头部热工测定情况。通过热平衡计算及钢锭的实际测量表明,9.5吨钢锭用绝热板保温帽的容积比为12.3％是可行的。为减少保温帽侧面热损失,绝热板配方应当改进,建议配加5～8％的无机纤维。为减少保温帽顶面热损失,K_(10)保温剂加入量应适当增加。 This article describes the upper and lower small mold with insulation cap pouring heavy rail steel head thermal determination. The calculation of heat balance and the actual measurement of steel ingot show that the volume ratio of thermal insulation cap of 9.5 tons steel ingot is 12.3%. In order to reduce the heat loss on the side of the thermal insulation cap, the insulation board formulation should be improved. It is recommended to add 5% to 8% inorganic fibers. In order to reduce the heat loss on the top of the thermal insulation cap, the added amount of K_ (10) thermal insulation agent should be increased appropriately.