铝铸鉄是铝和普通铸鉄组成的合金。工业中常用的有两种:(1)含铝量大于18％的高铝铸鉄,机械性能为:σ_b=11～17公斤/毫米~2,α_k=0.1公斤·米/厘米~2,H_B=170～240公斤/毫米~2;(2)含铝量小于8％的低铝铸鉄。后者由于工作温度不高(低于700～800℃),所以应用不广。至于含铝在8～18％范围内的,因为硬脆,不能机械加工,所以没有得到实际应用。总的说来,铝能在该铸铁表面形成一层氧化膜,故 Aluminum castings are made of aluminum and ordinary castings. There are two commonly used in the industry: (1) high aluminum castings containing more than 18% aluminum, with mechanical properties of: σ_b = 11-17 kg / mm2, α_k = 0.1 kg.m / cm2-2, H_B = 170 ~ 240 kg / mm ~ 2; (2) Cast aluminum with low aluminum content less than 8%. The latter due to the working temperature is not high (less than 700 ~ 800 ℃), so the application is not widely used. As for the aluminum content in the range of 8 ~ 18%, because of hard and brittle, can not be machined, it has not been practical. In general, aluminum can form an oxide film on the surface of the cast iron