目前在我国机械制造工厂中,采用箱式和井式电炉加热工件的甚为普遍,但是在这类炉中加热时,往往使工件易于产生表面氧化和引起表面脱碳。为了防止氧化和脱碳,很多工厂采用装箱密封的方法,即把工件埋入盛有木炭、砂子或生铁屑的箱子中来进行加热。这种方法虽然在某种程度上能够达到不氧化不脱碳的目的,但 Currently in China’s machinery manufacturing plant, the use of box-type and well-type electric furnace heating the workpiece is very common, but in such furnace heating, the workpiece is often prone to surface oxidation and cause surface decarburization. In order to prevent oxidation and decarburization, many factories use the method of box sealing, that is, the workpiece is buried in a box filled with charcoal, sand or raw iron to be heated. Although this method to some extent can achieve the purpose of non-oxidized non-decarbonization, but