| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.3 ( September 1981 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Continuous Casting of Beam Blanks Masayuki Onishi, Tetsuo Ueda, Yutaka Shinjo, Hisakazu Mizota, Minoru Yao, Toshio Fujimura |
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Synopsis : No.3 continuous casting machine at No.1 steel-making shop in Mizushima Works of Kawasaki Steel Corp., has a world's unprecedented dualrole feature of casting large-section blooms and beam blanks both. The machine has been successfully operating since October, 1973. In continuous coating of beam blanks, various kinds of defects are liable to occur due mainly to their complex forms, but nowadays improvement in cooling conditions, adoption of suitable mold powders and improved maintenance of the machine have made it possible of process almost all cast blanks into many different shapes without any conditioning. Casting speed has also been increased without any quality degradation by adopting a suitable cast supporting method for preventing flange deformation of cast blanks, after calculation of stress distribution of the solidified shell and studying a new method of supporting cast blanks. Operational results are as follows: (1) Casting time ratio: 90.6% (2) Frequency of breakouts: 0.02% (3) Yield of cast blanks: 99.6% (4) No surface conditioning ratio: 99% or higher |
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