抄録
In this research, the effects of steel can scrap use rate in spheroidal graphite cast iron were investlgated. Used steel cans were made by two kinds of processes ; one consisting of only pressing, and another which removes the Al-Mg alloy of the can-top to some extent by magnetic-selection treatment after the shredder process. The research results were as follows.
At a steel can use rate of 80%, the Al content of pressed cans was 4.25%, and that of shredder-processed cans was 1.72%. Cr and Sn increased with the use of the pressed cans and shredder-processed cans, but Ti increased only with pressed cans. Tensile strength and hardness increased with the increment in the use rate of steel cans. When the use rate of pressed cans exceeded 10%, elongation decreased abruptly. And when that of shredder-processed cans exceeded 40%, elongation decreased abruptly. It was also found that compacted vermicular graphite appeared at a use rate of 20% for pressed cans, and 80% for shredder-processed cans. On the other hand, Al-Fe-C ternary compound generate appeared from a use rate of 40% for pressed cans, and 80% for shredder-processed cans.
The above results showed that pressed cans could be used to 10% as the dissolution material of electric furnaces and shredder-processed cans to 40%.
