宝钢板坯连铸结晶器平均热流

Average Heat Flux in Crystallizer of Slab Continuous Caster

对宝钢板坯连铸过程结晶器平均热流的研究发现,当拉速增加到1.2m/min以上时,由于结晶器冷却水进、出水温差不再增加,结晶器宽边平均热流不再随拉速的增加而进一步提高.结晶器的平均热流与钢的碳含量之间有明显关系,含碳0.11%左右的钢浇铸时结晶器宽面和窄面的平均热流均最低.当拉速超过1.0m/min,在浇铸碳含量为0.002%～0.05%和0.13%～0.15%的钢时,相当数量的炉次结晶器窄边热流接近甚至超过宽边热流,表明采用较高拉速浇铸这两种碳含量钢时结晶器窄边锥度偏大.

An investigation was made on the average heat flux in the Crystallizer of a slab continuous caster at BAOSTEEL. It was found that, when the casting speed increases to 1.2 m/min and more, the average heat flux on broad faces does not increase further with the casting speed while the temperature of the inlet and the outlet cooling water does not changed. The average heat flux is also affected by the carbon content of casting steel. When a steel with about 0.11% carbon is cast, the average heat flux of both the broad and narrow faces of the mold decreases to minimum values. When the casting speed is more than 1.0 m/min and the carbon content is 0.002%-0.05% or 0.13%-0.15%, the average heat flux on narrow faces is very close to the average heat flux on broad faces or even higher. This fact indicates that the mold wall taper should be reduced for the high speed casting of the steels with those carbon contents.