以往各种热处理电阻炉的炉衬,大都采用体积密度为1.3～1.9的轻质和重质耐火砖砌成。通常1.3轻质耐火砖砌炉衬,1.9重质耐火砖砌炉门。这些耐火砖由于密度高,使炉衬蓄热量大,升温时间长。特别是一些大型周期式作业炉,从冷炉加热到工作温度,炉衬所吸收的热量比工件本身加热需要的热量还要多。一台用体积密度高的耐火砖砌成的大型热处理电阻炉,从室温加热到850～950℃工作温度,往往需要十几小时;而用密度小的耐火砖只需几小时,因而热能浪费很大。过去我国生产的轻质耐火砖由于强度低、耐磨性差,在热处理电阻炉上未能广泛采用。最近,上海电炉耐火材料厂在有关单位协助下,采用新工艺,试制 In the past a variety of heat treatment furnace lining furnace, most of the bulk density of 1.3 to 1.9 light and heavy refractory brick. Usually 1.3 light refractory brick lining, 1.9 heavy refractory brickwork furnace door. Due to the high density of these refractory bricks, the lining heat storage, heating a long time. In particular, some large-scale cycle furnace, from the cold furnace to the operating temperature, the lining of the heat absorbed by the workpiece itself requires more heat. A large refractory brick with a high bulk density refractory brick heat treatment furnace, heated from room temperature to 850 ~ 950 ℃ operating temperature, often takes more than ten hours; and with a small density of firebrick only a few hours, so the heat wasted Big. In the past, China’s production of light refractory bricks due to low strength, poor wear resistance, heat treatment resistance furnace has not been widely used. Recently, Shanghai EAF refractories plant with the help of the relevant units, the use of new technology, trial production