ZL302合金由于具有优良的耐腐蚀性且在铸态下有较高的机械强度,其熔炼工艺又较ZL301简单,形成热裂的倾向也较ZL301小,故大量用于舰载雷达的转盘、底座、盖罩类铸件上。但该合金有较强的氧化、吸气倾向,收缩率大,易形成缩孔、缩松。尤其是当熔炼温度过高时,往往形成黑断口。仅以大型薄壁另件“盖”为例,该件壁厚为5mm,高500mm,直径φ700mm,七八一七九年度生产时,出炉 ZL302 alloy because of its excellent corrosion resistance and high mechanical strength in the as-cast, the melting process and ZL301 simple, the tendency to form thermal cracking than the ZL301 small, it is widely used in carrier radar turntable, base , Cover castings on the class. However, the alloy has a strong oxidation, inspiratory tendency, shrinkage, easy to form shrinkage, shrinkage. Especially when the melting temperature is too high, often form a black fracture. Only a large thin-walled parts “cover”, for example, the wall thickness of 5mm, 500mm high, diameter φ700mm, baked in 781-1979, baked