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Structure Improving Methods of Tundish

Number of visits: Date:2013-5-10

Structure improving methods of Tundish

1.Enlarging capacity of tundish

The capacity of tundish affects liquid level and staying time of molten steel, so a tundish with large capacity can ensure molten steel in a stable condition when changing ladle and preserve slag entrapment. In 1980s, the North America had produced tundishes with whose capacity all more than 45 tons, and the largest is 70 tons. Tundishes that produced by Japanese are all with capacity more than 60 tons, and the largest is 84 tons.

2.Shape H tundish

Japanese steel mill had proved it by experimentation that the Shape H tundishes can control  flow ability of molten steel and thus achieve a good casting effect. Using Shape H tundish can make sure the molten steel flowing stably and extend the storage period of molten steel. What important is that it can protect from waving of liquid level and slag entrapment.

3.Gas curtain of tundish

Gas curtain of tundish is new skill that researched and developed with the developing of  metallurgy and draws experience of  ladle argon stirring skill.

Making argon blowing to ladle through  argon blowing holes that setted in line on the bottom of ladle, and the argon bubble turns into a gas curtain in the ladle, which is named as gas curtain of tundish. With the help of bubble, nonmental materials are dispelled, at the same time, it avoids redundant sundries when using slag barrier. Such a technology requires that the purging plug used for argon blowing has good abilities of high temperature resistance and steel scouring resistance.

4.Centrifugal flow tundish

Kawasaki Steel researched and developed centrifugal flow tundish that drives by electromagnetism. The working theory is rolling molten steel in tundish in the help of electromagnetic field, and dispelling foreign impurity at the using of centrifugal pull when rolling molten steel. By using centrifugal flow tundish, blowholes of casting blank are disappear, strip flaws are reduces more than 50% , the oxygen mass fraction decreases to 1/3 or so, foreign impurity reduced 1/2 and appearing draws index of cold rolling and hot rolling are amount to 60% of ordinary tundish.

5.Setting flow control service of tundish.

1) Dam and weir

It is very helpful to change flow direction of molten steel to set weir and dam, and also extending staying time of  molten time to help foreign impurity to float. Weir is the upper retaining wall and dam is the lower retaining wall, and most of time the are working together.

2) Filter

Filter is partition wall with  micropore structure, which stretch all of the tundish from liquid level to bottom. Molten steel flows from micropore, but as the filter easy to be blocked so the coast of  such a equipment is a little high.

3) Tundish bottom purging plug

Purging plug is setted on the bottom of tundish, which between ladle stream pouring region and tundish ladle, and bottom blowing gas usually is argon. When blowing argon through purging plug, bubble will absorb foreign impurity and floating with them, which ensures the purity of molten steel.

4) Tundish turbulent flow controller

Turbulent flow controller can restrain the lash to tundish when molten steel flowing, which always setted below to the pouring molten steel. Molten steel flows out from ladle nozzle in a high speed, pouring into turbulent flow controller and flowing out from upper entrance in the opposite direction, which improves the flow quality of tundish, enhances the staying time of molten steel and beneficial for the departing and flapping of foreign impurity.

TypeInfo: Industry dynamics

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