| Graphite spheroidization, matrix, fading, mass effect and acid-resistance in the range of various additional amount of Fe-Si-Mg in spheroidal graphite castiron were studied. The important results obtained are as follows. 1. When a great amount of Fe-Si-Mg was added to thec aast iron, radiated spheroidal graphite was formed, where Si and Mg in the additional alloy promoted to radiate the spheroidal graphite. 2. The more amount of Fe-Si-Mg was added to the cast iron the more ferrite was appeared in the matrix and the hardness was increased by the effect of silicon in the additional alloy. 3. When a great amount of additive was added, the more the carbon content was and the faster the cooling velocity was, the less radiated spheroidal graphite was formed. 4. Radiated spheroidal graphite which was formed by a great amount of additive became perfect spherical shape gradually as the fading time went by. 5. The more additional amount of Fe-Si-Mg was, the less the effect of inoculation became. 6. As the amount of additive increased. Corrosin-resistance in HCl solution was improved lineously by the effect of Si in the Fe-Si-Mg alloy. |
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