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５ 钢－材系统热过程数学模型５．１ 基本假设（１）边界上换热条件相同，即对称冷却或加热；（２）钢锭或连铸坯的热物性是各向同性的，仅为温度的函数，忽略密度的变化；（３）板坯成垛时，忽略板坯间的接触热阻；（４）炉气为温度均匀的灰介质；（５）炉墙处理成一维大平
5 STEEL-MATERIALS THERMAL PROCESS Mathematical Models 5.1 Basic assumptions (1) The same conditions of heat exchange at the boundaries, ie, symmetrical cooling or heating; (2) The thermal properties of ingots or slabs are isotropic, only temperature Ignoring the change in density; (3) when the slab is in a stack, ignoring the thermal contact resistance between the slabs; (4) the furnace gas is a homogeneous gray medium;