Abstract：The problem of serious cracking was observed during bending test of Q235B hot-rolled coil produced by one factory. The cracking position and non-cracking position of steel plate were compared and analyzed by means of optical microscope, scanning electron microscope and energy disperse spectroscopy. The results showed that there were obvious inclusions 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.
2024, Vol. 42 
