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公开(公告)号：US20190048431A1
公开(公告)日：2019-02-14
申请号：US16079712
申请日：2017-02-15
发明人： Yusuke FUJII , Yoshie NAKAI , Naoki KIKUCHI , Naoya SHIBUTA , Shinichi NAGAI , Takahiko MAEDA , Yuji MIKI
摘要： A molten steel refining method includes throwing a powder to molten steel while heating the powder with a flame formed by combustion of a hydrocarbon gas at the leading end of a top blowing lance. The lance height of the top blowing lance (the distance between the static bath surface of the molten steel and the leading end of the lance) is controlled to 1.0 to 7.0 m, and the dynamic pressure P of a jet flow ejected from the top blowing lance calculated from equation (1) below is controlled to 20.0 kPa or more and 100.0 kPa or less. P=ρg× U2/2 . . . (1) wherein P is the dynamic pressure (kPa) of the jet flow at an exit of the top blowing lance, ρg the density (kg/Nm3) of the jet flow, and U the velocity (m/sec) of the jet flow at the exit of the top blowing lance.
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公开(公告)号：US20240042515A1
公开(公告)日：2024-02-08
申请号：US18269057
申请日：2021-11-29
IPC分类号： B22D11/115 , B22D11/00 , B22D11/041
CPC分类号： B22D11/115 , B22D11/001 , B22D11/041
摘要： A continuous casting method of steel of continuously casting a slab by using a vertical liquid bending type continuous casting machine. The method includes, while performing continuous casting by using an in-mold electromagnetic stirring device, applying an alternating-current moving magnetic field that moves in a width direction of a mold to molten steel inside the mold, inducing a swirling flow in the molten steel, and stirring the molten steel. A travel speed of the alternating-current moving magnetic field calculated by a specified formula is in a range of 0.20 to 1.50 m/s.
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