INVESTIGATION ON CAST IRON HAVING FINE GRAPHITES PRODUGED BY MELTING CAST IRON COVERED WITH SLAG CONTAINING TiO2 (IV)
Some Melting Conditiona for Manufacture of S-H Cast Iron
1954 Volume 40 Issue 10 Pages 986-990
Details
1954 Volume 40 Issue 10 Pages 986-990
(1) In a Tamman furnace cast iron was melted under the most suitable conditions found in the previous investigation for production of the cast iron having eutectic graphite structure. Then the cast iron melt was kept at liquid state in the furnace for various durations of time, after the cover of the liquid slag had been removed. And then, the cast iron melt was cast in a dry sand mould and the graphite structure of the cast metal was esamined.
It was confirmed that the eutectic graphite structure appeared even in the cast iron which had been kept at naked, liquid state for 60 minutes before the melt was cast.
(2) Two kinds of cast iron-cast iron A and cast iron B were prepared, both having the same composition except Ti and the eutectic graphite structure. The former was produced by the new process the authors discovered and the latter by casting liquid cast iron into a metal mould.
They had been remelted and then kept in the furnace without the cover of liquid slag for various durations of time before the cast iron melt was cast into a dry sand mould. It was found that, in the case when cast iron A was used in the esperiments, the eutectic graphite atructure appeared even in the cast metal which had been kept for 60 minutes in the furnace at liquid state before tbe melt was cast. In the case when cast iron B was used in the experiments, however, the eutectic graphite structure was not observed even in the cast metal which had been kept for such a short time as 15 minutes at liquid state before tho melt was cast.
(3) Al content of the cast iron melt should be kept as low as possible for production of the cast iron with the eutectic graphite structure by the new process the authors discovered.
(4) It was confirmed tbat the basicity of the slag-CaO/SiO2 should be taken into consideration when the new process the authors discovered was applied in practice.
