Defect Analysis and Process Improvement of Balling Steel S650A
By means of metallographic analysis of microscope,the improper position of ultrasonic defect detection of balling steel was examined and analyzed.The results show that there are two main reasons for the cracks in the steel:first,there is serious central porosity in the local position of continuous casting blooms,which is caused by non-welding during rolling;second,the molten steel is easy to contact with the air and absorb the moisture or gases in the air.After the molten steel so-lidifies into a cast bloom and is heated and rolled,the gas precipitates and accumulates in the center and acts together with the structural stress,finally,the center of the round steel cracked.Corresponding process improvement measures are put forward according to the above reasons.
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