Abstract
Various mixture of the charge materials in the cupola melting were perfermed in our foundries. Consequently, it has been clarified that by applying the method as described later to the cupola operation the successful production of iron castings having the required composition can be obtained easily compared with the usual operation by empirical mixing. (1) In the first instance careful consideration was payed in the management of cupola charge materials. Namely, iron and steel scraps were divited into several classes by fracturing inspection, and the charge materials, pig-iron and returned scrap etc. were analysed chemically. (2) The actual calculation of the proportions of the charge was carried out easily by using a triangle diagram with three component as pig-iron, iron scrap and returned scrap of known analysis. (3) After mixing calculation was performed for getting the required carbon content, the additional controls of silicon and manganese contents were obtained respectively by adding ferro-alloys. (N. T.)
