Abstract
The cracking of cold heading steel during drawing was researched in this paper. The defects were detected by scanning electron microscope and EDS energy spectrum analysis, the direct causes of cracking were discussed and analysed, and the corresponding improvement measures were put forward. Results showed that the large size inclusions with high alumina content in steel were the main cause of cracks in cold heading steel due to their poor deformation ability. The plasticity of inclusions could be controlled through optimization of refining slag to reduce both the CaO and Al2O3 content.
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