对82B 在拉拔过程中出现的笔尖状断口进行分析，认为铸坯中心碳、锰、铬成分偏析以及轧后冷却速度过快产生了马氏体组织，相变时引起晶格畸变，由于马氏体硬度高、变形能力差，微裂纹在拉拔过程中萌生并扩展，导致断裂。这是导致笔尖状断裂的主要原因，为此通过采取措施降低铸坯成分偏析，优化轧后冷却工艺，降低马氏体组织尺寸，取得了较好的效果，解决了拉拔过程笔尖状断裂现象。
Central segregation of C,Mn,Cr and large cooling rate after rolling can lead to the formation of martens-ite in the center of wire rod,which caused the lattice distortion during transformation.Because of the high hardness and poor deformation capacity of martensite,microcrack was formed and developed in the drawing process,which caused the fracture of wire rod.This was the main causes of pencil-tip shaped fracture of 82B wire rod during the drawing process.For this reason,reducing the composition segregation of billet and optimizing the cooling process after rolling were adopted to decrease the size of martensite,by which it can obtain good results and solve the pencil-tip shaped fracture in the drawing process.
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