Analysis of Cone Fracture of ER70S-6X Welding Wire Steel Wire Rod
This paper analyzes the causes of the serious problem of frequent brittle fracture and easy tearing of the ER70S-6X wire rods during the drawing process by users,with the wire rods showing fish-scale cracks and backward spikes on the surface,cup-conical tearing at the break point,and hollows at the break point.The analysis shows that the main cause is the central shrinkage pores and negative segregation in the billet.Based on the analysis of the causes,the optimal production process of"executing 1.8 Ukg water ratio+no solidification end electromagnetic stirring"was determined through optimization of the secondary cooling water supply and solidification end electromagnetic stirring parameters,sampling and inspection analysis.After the process improvement,the center shrinkage pores and bright band defects in the billet were effectively controlled.After the production of ER70S-6X welding wire rod with Φ6.5 mm and Φ5.5 mm specifications was tracked and sent to the users,no more cup-conical tearing fractures or hollows were found during the drawing process.The improvement effect of the process is good.
cup-conical fracturenegative segregationcentral shrinkage poressecondary cooling strengthsolidification end electromagnetic stirringbright band
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