THE IMPROVEMENT IN PROPERTIES OF MOLTEN IRON (IV)
The Utilization of Oyxgen Blowing for Cupola Molten Iron
1957 Volume 43 Issue 1 Pages 12-17
Details
1957 Volume 43 Issue 1 Pages 12-17
One of the authors reported1) that by the O2 blowing treatment into molten iron the properties of the iron were improved, and moreover it was supposed that the O2 blowing treatment was suitable for producing the following cast irons; (1) direct castings from blast furnace molten iron, (2) cast iron contained various C and Si contents from cupola molten iron, (3) high strength cast iron, malleable iron or cast steel.
So, in order to obtain the reference data for these above applications, the tests of O2 blowing treatment into cupola molten iron of 450kg, contained high C (3.7-`3.8%), were carried out three times. From the experimental results, it was made clear that the more rapidly the temperature of molten iron increased by O2 blowing and the higher the temperature of iron reached was, the more easily the decaburization proceeded. Cast irons added with the proper amounts of Fe-Mn, Fe-Si and Ca-Si, alloys after O2 blowing showed the properties of high strength, less mass effect and high heat-resistance in comparison with the iron without O2 blowing treatment.
As tho O2 blowing treatment increased the temperature of molten iron and decreased easily the contents of C and Si in the iron, the treatment was suitable for the manufacture of high strength cast iron. For instance, by the inoculation with Ca-Si alloy after O2 blowing into the iron of C 3.4%, the cast iron showed about 38kg/mm2 tensile strength.
