Research On Secondary Cooling System For Continuous Casting Of D36 Slab

In the casting process, the effect of the secondary cooling zone has a significant impact on the quality of the slab. By researching the formation of slab during the secondary cooling zone and analyzing the impact of process conditions on the slab quality, and then propose improvement program.To study the bulging of the slab, establishment of a two-dimensional model by using vertical sectioning in ANSYS.D36 steel as a research object, simulate heat transfer and solidification process of slab, obtain slab temperature field, the change of surface temperature, shell thickness, heat flux, bulging, first principal stress and shell equivalent stress.The results show, when the casting speed is 1.0m/min, casting temperature is 1560 ℃, the amount of water is 0.84L/kg, the billet’s metallurgical length is 11.45 m, the billet’s surface temperature warms 102℃ in the zero-section, drum magnanimous increase 2.599 mm in foot roller segment. Along the casting direction, the billet’s deformation and stress decreased. By comparing the different conditions of crafts,when the casting speed is faster, casting temperature is higher, the amount of water is more, surface temperature is higher, shell thickness is thinner, heat flux is higher, drum magnanimous is bigger. Compared to the casting temperature and the amount of water, casting speed is greater impact on the surface temperature, shell thickness, heat flux and drum magnanimous.Optimize the secondary cooling water system, the amount of water increases from 0.84L/kg to 0.88L/kg when the casting speed is 1.0m/min, the quality of slab has been significantly improved.