WANG Qiang
,
WU Ye-ming
,
QIU Sheng-tao
,
ZHAO Pei
钢铁研究学报(英文版)
A computational model of thermal behavior of the top-surface slag layers in continuous casting mold was applied to interpret the thermal insulation of mold powder. The temperature drop of liquid steel caused by heat removal at the interface of molten steel and slag in mold was proposed to evaluate the thermal insulation of mold slag. The calculation results show that slag consumption is one of important factor influencing the temperature drop, while the casting speed has no obvious effect on it. With the increase of slag consumption, the temperature drop is increased.
关键词:
thermal insulation
,
temperature distribution
,
heat flux
,
temperature drop
LI Pei-song
,
LU Jun-hui
,
QIU Sheng-tao
,
WANG Zhong-ying
,
ZHAO Pei
钢铁研究学报(英文版)
A circular seam cooling nozzle and its online control system have been developed to reduce the center segregation in high carbon steel billets by decreasing the superheat of the molten steel and improving the equiaxed crystal ratio based on the numerical results. An industrial experiment has been carried out on a 150 mm×150 mm caster to investigate the effect of the circular seam cooling nozzle on the superheat removal of the molten steel. The results show that the circular seam cooling nozzle can be used to control the casting temperature in a closed loop control system. The online control system can be effectively adapted to the variation of operating parameters. The casting lasts about 4 h and about 400 t steel is successfully produced in a continuous operation. The removal of about 14 ℃ superheat and the improvement of approximate 10% equiaxed crystal ratio can be achieved by the newly developed circular seam cooling nozzle.
关键词:
circular seam cooling nozzle
,
high equiaxed crystal ratio
,
billet
,
low superheat
