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石墨易切削钢是顺应易切削钢无铅、低硫这一发展趋势而提出的。具有亚共析组织的钢种其石墨化过程一直很难,因此该钢种开发的关键是促进其石墨化过程。基于增加石墨核心来加速石墨化过程进行了钢种的成分设计与研制。结果表明,正是开发钢中具有与石墨结构(简单六方)相同的BN成为了石墨的形核位置,从而有效促进了开发钢的石墨化过程。开发钢的组织由铁素体和石墨组成,其中,石墨的缺口效应和润滑效果赋予了开发钢较高的切削性能和冷成形性能。
Graphite free cutting steel is to comply with the trend of free cutting steel lead-free, low-sulfur proposed. With sub-eutectoid steel grade graphitization process has been difficult, so the key to the development of the steel is to promote its graphitization process. The composition design and development of steel grades were carried out based on the increase of graphite core to accelerate the graphitization process. The results show that it is the same BN in the developed steel as the graphite structure (simple hexagonal) which becomes the nucleation site of graphite, thus effectively promoting the graphitization process of the developed steel. Development of the organization of the steel by the ferrite and graphite composition, in which the graphite notch effect and lubrication given the development of steel high cutting performance and cold forming properties.