Investigation of Surface Flow Velocity and Vortex Formation Flow Patterns in Continuous Slab Casting Mold through Physical Modelling
The quality of continuous cast steel is greatly influenced by fluid flow in the mold,particularly at the meniscus.Slag entrainment in the continuous casting mold is one of the major causes of macro non metallic inclusions in continuous casting steel products.It leads to quality problems like sliver formation and surface cracks on the surface of final rolled products.The structure of submerged entry nozzle (SEN) is regarded as a crucial factor in determining flow related phenomena in the mold.In order to understand liquid steel flow at the meniscus,it was decided to look at the existing as well as new design of submerged entry nozzles using water model studies.Design variables include the port angle and port height while the effect of submergence depth is investigated.Experiments were carried out for different casting speeds (1.2-1.8m/min) and submergence depths of SEN (120-240mm) and submerged entry nozzle with different port angles (0°,15° and 25°).Time averaged fluid velocity distribution along the mold width direction just under the meniscus was measured using impeller-velocity probes.A camera was used to record vortexing flow patterns,which were visualized by injecting black sesame seeds into the water.Vortex phenomenon was characterized by two parameters,viz vortexing frequency and vortex depth.Submergence depth had a strong effect with deeper submergence depths leading to a reduction in meniscus turbulence and a reduction in the risk of entrainment.Insights gained from this modeling efforts aid greatly in the development of processing conditions to avoid the formation of defects in the final products.
water modelling sub meniscus velocity vortexing slag entrainment
Ravi GOLANI Vikas SINGH S.K.AJMANI Ravi RANJAN
Tata Steel Ltd.,Jamshedpur-831001,India
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
427-430
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）