继本刊1984年第10期发表《牌号铸铁的炉前控制》一文后,现再谈谈牌号铸铁的选材计算问题。一、选材计算常用的两种图表 (一)决定铸铁基体组织(石墨化)的计算图(图1) 这张图是在前人成果的基础上,结合铸铁各级牌号的成分建立起来的双曲线组织图,主要用以解决其C、Si含量,冷却速度(以铸件壁厚为表征 Following the publication of No. 10, 1984 issue of “grade cast iron furnace control,” a text, then talk about the grade castings material selection problem. First, the selection of materials commonly used two kinds of charts (A) determine the cast iron matrix (graphitized) calculation diagram (Figure 1) This picture is based on previous achievements, combined with the composition of cast iron at all levels of the dual Curve organization chart, mainly used to solve its C, Si content, cooling rate (cast wall thickness is characterized