Analysis of the Causes of Abnormal Cracks in Bending of HRB400E Hot Rolled Ribbed Steel Bars and Technical Improvements
The quality problem of Φ16 mm hot rolled ribbed steel bar produced by the company is the bending cracks that appeared in the process of using.Through the problem samples for chemical composition and performance analysis,metallographic organization observation,energy spectrum element analysis,etc.,and at the same time with the steelmaking engineers,continuous casting engineers for analysis,and ultimately believe that the main reason for this rebar bending crack is the intermediate liquid level of the ladle is lower than the prescribed range,in the case of uncontrolled operation according to the original plan of continuous casting,which led to intermediate ladle molten steel liquid level drops and protection slag involve,so ther are inclusions in the steel bar.In the actual engineering application process,the bending deformation of the steel bar when the slag generated at the bending cracks caused by internal stress.Combined with the quality of the problem to develop three recommendations to strengthen the steelmaking and continuous casting production organization and management and staff training,strengthen the intermediate packet liquid level control,in the steel below the prescribed range of timely plugging operation,through the on-site inspection to improve the surface quality of the billet,through the development of the program steelmaking,continuous casting operator level has been significantly improved,billet quality to enhance the remarkable,in the production process since then production of rebar did not The quality of steel bars produced in the subsequent production process did not appear such quality objection problems.
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