长期以来,灰铸铁的生产水平比较低,生产较高牌号的灰铸铁常采用低,碳当量的方法,铸件废品率较高。实践使我们认识到,高温铁水、高废钢配料、高碳当量是获得优质高强度灰铸铁的重要前提。我们通过提高灰铸铁的硅碳比以改善铸件质量、提高材质的性能。经过较长时间的试验生产,取得了满意的结果。现将低应力高强度优质灰铸铁在中型铣床上的试验及生产应用情况总结如下,以供参考。一、化学成分及生产试验条件 For a long time, the production level of gray iron is relatively low. Gray iron with higher grades often adopts low and carbon equivalent methods, resulting in a higher reject rate of castings. Practice has made us realize that high-temperature hot metal, high-scrap ingredients, high carbon equivalent is an important prerequisite for obtaining high-quality, high-strength gray cast iron. We improve the quality of castings by improving the silicon-carbon ratio of gray cast iron. After a long period of trial production, and achieved satisfactory results. Now the low-stress high-strength high-quality gray cast iron in medium-sized milling machine test and production applications are summarized below for reference. First, the chemical composition and production test conditions