ON THE PROPERTIES OF CAST IRON MELTED BY AN ELECTRIC FURNACE (II)

Abstract

Owing to investigate the properties of cast iron melted by an electric furnace, we have freshly held the Matsumura's repeated test and O₂ analysing test, and report its test results.
The results obtained are summarised as follows:
(1) Cast iron melted by an electric furnace contains more O₂ (FeO) and H₂gas than melted by cupola.
(2) The more the O₂ (FeO) content, the more abnormal the graphite distribution. The more abnormal the graphite distribution, the lower the impact value. This is the cause of brittleness of cast iron melted by an electric furnace.
(3) The more the H₂content, the more easily be found the sbrinkage cavity. This is the cause of shrinkage cavity of cast iron melted by an electric furnace, we assumed.