METHOD FOR DRAWING OUT CAST SLAB AT THE INITIAL STAGE OF CASTING IN CONTINUOUS CASTING AND ITS DUMMY BAR HEAD

Japanese Patent JP2950127

B2

PURPOSE: To prevent the seal leakage and the breakout between a dummy bar head and the inner wall surface of a mold while improving the surface and the internal qualities of a cast slab at the initial stage of continuous casting, to prevent the separating accident of the dummy bar and to easily separate and take out the dummy bar head at a prescribed position.
CONSTITUTION: At the start time T0 of drawing the cast slab after starting the pouring, the drawing velocity of the cast slab is raised up to a first casting velocity V1. Successively, this velocity is held for a fixed time to prevent the seal leakage, etc., and at the time T1, the casting velocity is linearly raised at the fixed acceleration (a) up to the stationary casting velocity Vc to raise the molten steel temp. in the mold. Exothermic powder is used during a period from the time of the start of pouring to the time T2. In the dummy bar head, an arc hook-like recessed groove having (t+α) radius of the inner surface and (t+β) radius of the outer diameter is formed, and the cast slab and the dummy bar are firmly connected and can easily be separated at a prescribed position.

ARAI KAZUHIRO
IIBASHI TETSUYA
SHIMAZAKI HISASHI
ARIMOTO TERUMI
TANIZAWA YOSHINORI

JP33707793A

September 20, 1999

December 28, 1993

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SUMITOMO KINZOKU KOGYO KK

B22D11/08; B22D7/10; B22D11/10; B22D11/108; B22D11/111; B22D11/20; (IPC1-7): B22D11/20; B22D11/08; B22D11/10

JP5416332A
JP1210157A
JP57152359U
JP4979617U

Toshi Hisamon

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