390 alloy die castings having differences in transverse strength at different positions were studied by measuring molten metal flowing behaviors in a die cavities. A part in a die casting having low transverse strength is that in which solid-liquid mixture of high volume fraction of solid including scattered structures has been filled at slow injection velocity. Primary silicon easily segregates in this part. To reduce the interval from pouring in a sleeve to injection, to increase the

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... ling ratio in the sleeve, and to fill the die cavity homogeneously and quickly result in minimizing segregation of primary silicon and recovery of transverse strength. 390 alloy is die cast without difficulities such as fusioned penetration. Fig. 1 Casting shape and measuring sensor positions for metal flow in die cavity.