本文重点对Y45CaS和Y40CrCaS两种易切削钢的性能进行了研究,其成分列于表1。试炼四批110多炉钢的低倍组织全部合格。检查结果,一股疏松、中心疏松、方形偏液析均在0.5～1.0级。无其它缺陷。对Y45CaS易切钢一些炉次所进行的非金属夹杂物形态、分布、大小和数量分析其结果为夹杂物特征为浅灰色长条状、杆状,纺锤状、 This article focuses on Y45CaS and Y40CrCaS two kinds of free-cutting steel performance were studied, the composition shown in Table 1. Trial batch of more than 110 furnaces low magnification organizations all qualified. Check the results, a loose, loose center, square partial liquid analysis at 0.5 to 1.0 level. No other defects. Analysis of the morphology, distribution, size and amount of non-metallic inclusions in some furnaces of Y45CaS free-cutting steel showed that the inclusions were characterized by light gray bar, rod, spindle,