为了满足模架钢加工与使用性能的需求,采用加入易切削元素硫,并适当添加锰、钙的成分设计思路,在优化冶炼、连铸、轧制工艺的基础上成功开发出了板坯连铸硫系 Y55钢板,并分析了它的硬度、组织、夹杂物与加工性能。结果表明：Y55钢板的硬度范围在180~200 HB 之间,其显微组织为珠光体和网状铁素体,夹杂物是以硫化锰为主的复合夹杂物；与S50C钢板相比,Y55钢板的加工性能大幅提高。
In order to meet manching and usability needs of mold steel,a slab continuous casting sulfur Y5 5 steel plate was successfully developed through adding free-cutting element sulfur, appropriate manganese and calcium,and optimizing smelting,continuous casting and rolling processes;its mechanical and cutting performances were analyzed.The results show that the hardness of Y55 steel plate was 180—200 HB,the steel′s microstrucure was pearlite and reticular ferrite,and the inclusions were composite inclusion mainly MnS-oriented.Compared with S50C steel plate,the machining performance of Y55 steel plate was improved sharply.
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