热轧圆钢热顶锻裂纹原因分析

热顶锻合格率是反映热轧圆钢实物质量的一个重要指标。在对国内外热轧圆钢热顶锻质量控制研究成果综述的基础上，对热轧圆钢的热顶锻质量进行了全面的调查、统计和试验研究，归纳了引起热轧圆钢热顶锻裂纹的常见原因，介绍了热顶锻裂纹分析步骤。通过对热顶锻裂纹的形貌和金相组织进行分析，阐述了引起热顶锻裂纹的冶炼因素和轧制因素，并进行了举例说明。

Cause analysis of hot upset forging crack of hot rolled round steel

The qualified rate of hot upset forging is an important index reflecting the physical quality of hot rolled round steel. On the basis of summarizing the research results of the hot upset forging quality control of hot rolled round steel at home and abroad, the hot upset forging quality of hot rolled round steel was comprehensively investigated, counted and experimentally studied. The common causes of hot upset forging cracks of hot rolled round steel were summarized, and the analysis steps of hot upset forging cracks were introduced. Through the analysis of the morphology and metallographic structure of the hot upset forging cracks, the smelting factors and rolling factors which caused the hot upset forging cracks were expounded and illustrated with examples.