板坯連鑄硫系Y55鋼板的研發及其性能

板坯連鑄硫系Y55鋼板的研發及其性能Research and Development of Slab Continuous Casting Sulfur Y55 Steel Plate and Its Properties

為了滿足模架鋼加工與使用性能的需求，采用加入易切削元素硫，并適當添加錳、鈣的成分設計思路，在優化冶煉、連鑄、軋制工藝的基礎上成功開發出了板坯連鑄硫系Y55鋼板，并分析了它的硬度、組織、夾雜物與加工性能。結果表明：Y55鋼板的硬度范圍在180~200 HB之間，其顯微組織為珠光體和網狀鐵素體，夾雜物是以硫化錳為主的復合夾雜物；與S50C鋼板相比，Y55鋼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 Y55 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.