我厂在大工件淬火的时候,学習别厂的经验,是采用馬弗爐来加熱的。馬弗爐罐子原来用鑄铁滲鋁制成,每个重300公斤,每月需要三个。这种罐子成本高,使用寿命短;容易产生氧化皮,堵塞烟道。用别的材料来代替,但都沒有試驗成功。最后我們买了兩根下水道管来試驗,結果却成功了。經过化驗,下水道瓷管的成分是:二氧化硅57.77％,二氧化鋁26.07％,二氧化铁9.68％,氧化鈣3.79％,氧化鎂0.93％,其余是 I plant in the large workpiece quenching time, learn the experience of other plants is to use muffle furnace to heat. Muffle furnaces were originally made of aluminized cast iron, each weighing 300 kg and requiring three per month. This jar high cost, short service life; easy to produce scale, block the flue. Instead of using other materials, but no successful experiment. Finally, we bought two sewer pipes to test, but the result was successful. After testing, sewer ceramic tube composition is: 57.77% of silica, aluminum dioxide 26.07%, 9.68% iron oxide, calcium oxide 3.79%, 0.93% magnesium oxide, the rest is