铸造铝硅合金的比重是铜合金及铸铁的1/3左右,比强度较高,耐蚀耐磨性较好,熔点低、熔炼能耗少,再生回收容易。铸造性能及使用性能优于其它铸造铝合金。但含硅>4.5%的铸造铝硅合金,具有收缩率小、流动性好、气密性好、热裂倾向小等优良的铸造性能,还有良好的物理机械性能及切削加工性能。所以,铸造铝硅合金 The specific gravity of the cast aluminum-silicon alloy is about 1/3 of that of the copper alloy and cast iron. The specific strength is higher, the corrosion resistance and abrasion resistance are better, the melting point is lower, the energy consumption of the melting is less, and the regeneration and recycling are easy. Casting performance and performance better than other cast aluminum. But silicon> 4.5% of the cast aluminum-silicon alloy with a small shrinkage, good fluidity, good air tightness, hot cracking tendency small excellent casting performance, as well as good physical and mechanical properties and cutting performance. So, cast aluminum-silicon alloy