To reduce the oxidation loss of a chromium by controlling decarbonization condition while grasping [C] concentration in molten steel, based on information of the molten steel temperature continuously measured, in a method for refining of the chromium-containing molten steel under reduced pressure.
In the method for decarbonization-refining by injecting oxygen gas and inert gas into the chromium-containing molten steel under reduced pressure; the molten steel temperature is continuously measured from starting time of reducing pressure, and the measured molten steel temperature and a calculating formula, are used to perform the control of the refining condition at each period of a natural decarbonizing period, an oxygen-decarbonizing period and a diffusion-decarbonizing period, and thus, a predictive precision of the [C] concentration at the completing time of decarbonization can be improved and also, the progressing state of the decarbonization reaction can be grasped and the oxygen-efficiency for decarbonization can stably be kept in the high grade.
COPYRIGHT: (C)2010,JPO&INPIT
TANAKA TOMOAKI
IGARASHI MASAO
YOSHINO KOICHIRO
| JPS634013A | 1988-01-09 | |||
| JPS63128114A | 1988-05-31 | |||
| JPH0543931A | 1993-02-23 | |||
| JPH06330145A | 1994-11-29 | |||
| JPH07233409A | 1995-09-05 | |||
| JPH11350018A | 1999-12-21 |
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu
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