The problem of serious cracking was observed during bending test of Q235B hot-rolled coil produced by one fac-tory.The cracking position and non-cracking position of steel plate were compared and analyzed by means of optical micro-scope,scanning electron microscope and energy disperse spectroscopy.The results showed that there were obvious inclu-sions in the material,which could induce the formation of cracks.Moreover,the content of manganese sulfide inclusions in the material was high.After adjusting the production process and controlling the content of manganese sulfide inclusions,the problem of bending cracking could be significantly improved.The recurrence of this problem was avoided.
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