OPTIMIZATION OF SECONDARY COOLING RATIO FOR CONTINUOUS CASTING TO INCREASE THE HEAT DELIVER AND HOT CHARGING TEMPERATURE OF SLAB
The steelmaking-medium plate production line of HBIS Group Hansteel Nengjia New Area adopts compact arrangement,and the common carbon and low alloy products adopt hot deliver and hot charging process.The hot deliver and hot charging process has many advantages,such as reducing the heating consumption of the furnace,shortening the production cycle of the product,increasing the output of the furnace,reducing the oxidation and burning loss of the billet,reducing the warehouse area and reducing the transportation cost.In order to improve the temperature of hot deliver and hot charging of slab and reduce the fuel consumption of heating furnace,the secondary cooling water of slab continuous casting in new area of Hansteel was optimized.At the casting speed of 1.10 m/min,the cooling water ratio of low alloy steel is reduced from 0.71 L/kg to 0.45 L/kg by uniformly reducing the water volume in each secondary cooling zone.The average surface temperature of the slab is increased from 1 050 ℃ to 1 130 ℃,and the average surface temperature of the slab is increased from 870 ℃ to 930 ℃.After fitting the optimized water flow density W in each zone with the distance L from the midpoint of each zone to the meniscus of the mold,it is concluded that W=2.767 3 L-1 186,that is,the 1.186 power of W and L satisfies the inverse relationship.
hot deliver hot chargesecondary cooling waterspecific water flowsurface temperaturewater flow density
NETL
NSTL
万方数据
