PRODUCTION OF SPHEROIDAL GRAPHITE-NODULAR CAST IRON.

There is a tendency away from heat treatment to as-cast ductile SG iron, using charges containing a proportion of high purity iron. More firms are installing induction furnaces and cupolas of improved design. The importance of using rigid molds is becoming accepted and has led to the installation of a number of rapid cold set resin sand mixers. The author believes that large, mechanized foundries will install low rated induction furnaces, possibly of the channel type, in which to hold magnesium treated iron at the desired temperature.