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Continuous casting system is known to be operating most efficiently under the steady state conditions.1) Transport rate of molten steel from tundish to the caster mold is among the parameters desired to be constant. In continuous casting operation of steel, the flow through tundish to the mold can be controlled by different flow rate control systems including stopper rod and slide-gate.2) These two tundish flow rate control mechanisms are commonly preferred in industry, where each one has its own advantages and shortcomings.3) Ladle changes in continuous casting machines result in liquid steel level changes in tundishes. During this transient event of production, the flow rate controller opening is increased to reduce the pressure drop across the opening which helps to keep the mass flow rate at the desired level for the reduced liquid steel level in tundish. Extensive and elaborate past work were conducted on the different aspects of tundish flow controllers of continuous casting machine such as slide-gate opening fraction, slidegate orientation, slide-gate design, stopper rod movement, stopper rod tilt and stopper rod misalignment, stopper rod sticking and the influence of these parameters on the mold flow structure.4–12) However, they all focus on one type of controller, therefore in literature there is no complete study focusing on the influence of flow controller type on mold flow structure. This work presents a unique comparison of the two Effect of Flow Rate Controllers and their Opening Levels on Liquid Steel Flow in Continuous Casting Mold