Production of Steels for Sheet and Coil in Continuous Casting
1972 Volume 58 Issue 3 Pages 387-394
Details
1972 Volume 58 Issue 3 Pages 387-394
Synopsis:
A number of new casting techniques to produce steels for sheet and coil in continuous casting have been developed and quality of continuously cast slabs with 200×1600 mm2 and products have been investigated. The results are summarized as follows.
1) It is desirable to decrease oxygen content as low as possible by pre-deoxidation before aluminum addition in converter.
2) A new method, which is characterized by Al-wire addition with rapid rate into molten steel stirred by inert gas injection in ladle, has been developed. This method results in increase of yield and accurate control of soluble Al content in steel.
3) The inert gas purging from the bottom of ladle gives a uniform bath temperature and is very beneficial in cleaning the bath.
4) A new sealing method for perfectly preventing the oxidation of steel stream from open air has been developed. By the application of this method, the content of inclusions in steel has been reduced to 20 to 40 ppm, which have been calculated in terms of oxygen content in steel in tundish.
5) A new nozzle is designed so that stagnant zone of steel bath is not formed in mold.
