Abstract
In order to elucidate the mechanism by which the surface quality of steel products containing a small amount o f Mo is noticeably improved, hot cracking in the grain oriented silicon steels containing 0.013% Mo and in steel containing no Mo has been investigated by the impact experiment. In the impact experiment after slab soaking, and under elevated temperatures the intergranular fracturing of silicon steel containing a small amount of Mo is found to be less than that of Mo free steel.In Electron Probe Micro Analysis (EPMA) and Glow Discharge Spectrometry (GDS) measurements after slab soaking, Mo segregates preferentially in the vicinity of the surface in the silicon steel containing Mo.It is concluded that, because of the preferential segregation of Mo in the vicinity of the surface of silicon steel containing a small amount of Mo during slab soaking or hot rolling, intergranular fracturing is inhibited, and, consequently the surface quality of final products is noticeably improved.
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