Study on the defect improvement method of BR1500HS coil collapse of hot-formed steel
Hot formed steel coil collapse has always been a common quality defect in hot rolling process,and it is more prominent in thin specification products.The phase change behavior of BR1500HS in the laminar cooling section was analyzed,and the flat coil defects were improved by controlled cooling.Through the simulation software,it can be seen that the pearlite transition end time is much longer than the bainite transition time.Therefore,by reducing the coil-up temperature of hot-formed steel BR1500HS from 580 ℃ to 520 ℃,the microstructure transformation was realized.Combined with the time difference of the microstructure group transformation,the original flat coil defect of hot-formed steel BR1500HS was effectively improved.The results show that the pearlite and ferrite structures of BR1500HS are obtained at 580 ℃,and the coil collapse appears in hot coils.When the coiling temperature drops to 520 ℃,the bainite and ferrite structures are obtained,the hot coiling shape is relatively good,and no flat coiling defects appear.
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