| 摘要 |
<p>A sleeve (6) serving as both a molten metal receiver and a pressure cylinder for a die casting machine is formed out of a metal material having a thermal conductivity of not more than 20 W/mK. Concretely speaking, the sleeve (6) is formed out of an iron-based alloy containing at least 7-19 wt.% of Ni and having metallographic/structure comprising mainly a martensite phase or a mixed phase of a martensite phase and an austenite phase. The iron-based alloy contains at least one kind of metal selected from the group consisting of 3-8 wt.% of Si, 0.3-2 wt.% of C, and 0.03-0.1 wt.% of Mg and Ca, and not more than 1.0 wt.% of Mn, and this alloy is, for example, spherical graphite cast iron. Since the sleeve (6) is formed out of a metal material of such a low thermal conductivity, the mixing in of a solidification phase is minimized, and high reliability and durability can be obtained. <IMAGE></p> |
