Twin-roll continuous casting is a near-net-shaping casting technology that possesses advantages of short processing time, low investment cost, and low energy consumption. Thus, this technique has been attracting great attentions of steelmakers of the world as one of the new technologies for the steel industry, which is developing with the tendency of low energy consumption, short processing time and low manufacturing cost.
The principle of twin-roll continuous casting is based on pouring the molten metal into the gap between two rotating water-cooling cylindrical copper rolls. The metal solidifies just before reaching the bite of the rolls and then is rolled while passing through the rolls. Correctly defining the height of the kiss point, where two solidified layers of molten metal are met between twin-rolls, has a great influence on calculating the force on the twin-roll and improving the quality of cast strips.
Kim Jong Min, a researcher at the Faculty of Materials Science and Technology, has studied the effects of the height of a molten pool, casting speed and the temperature of a twin-roll on the height of the kiss point for a twin-roll continuous caster with a diameter of 1 000 millimeters.
To determine the height of the kiss point, he simulated temperature distribution at the molten pool between twin-rolls by commercial simulation software ProCAST. Based on the mathematical modeling, he studied the effects of the height of a molten pool, casting speed and the temperature of a twin-roll on the height of the kiss point.
The results showed that with increase in the height of a molten pool and decrease in the casting speed and the temperature of a twin-roll, the height of the kiss point increases.
Thus, the casting speed, the height of a molten pool and the temperature of a twin-roll should be properly selected based on the thickness of the cast strip to guarantee the exact height of the kiss point.
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