公开(公告)号：EP1369191A1

公开(公告)日：2003-12-10

申请号：EP02712366.0

申请日：2002-02-14

申请人： NIPPON STEEL CORPORATION

发明人： FUKUNAGA, Shinichi, NIPPON STEEL CORP.YAWATA WORKS ,  NISHIHARA, Ryoji, NIPPON STEEL CORP.YAWAMATA WORKS ,  TANAKA, Kazuhisa, NIPPON STEEL CORP.YAWAMATA WORKS ,  ASANO, Mitsuji, NIPPON STEEL CORP.YAWAMATA WORKS ,  YASUMITSU, Kazunori, NIPPON STEEL CORP.YAWATA WORK ,  HIRAMOTO, Yuji, NIPPON STEEL CORP.YAWATA WORKS ,  MITAKE, Hiroyuki, NIPPON STEEL CORP.Technical Dev. ,  KAWACHI, Takeshi, NIPPON STEEL CORP.Technical Dev.

IPC分类号： B22D11/10 ,  B22D41/01 ,  H05H1/34 ,  H05B7/18

CPC分类号： H05H1/34 ,  B22D11/11 ,  B22D41/015 ,  H05B7/00 ,  H05H1/28 ,  H05H1/48 ,  H05H2001/3436 ,  H05H2001/3457 ,  H05H2001/3478

摘要： A plasma torch 20a used for heating a molten steel has an outer cylinder 26 composed of a double tube 21, the bottom of which is blocked annularly, and a bottomed cylindrical anode electrodes 28 that is installed within the outer cylinder 26 with a gap existing between the anode electrode 28 and the inside of the double tube 21, the plasma torch being characterized in that pure copper is not used as a material for the anode electrode 28, the material has a softening point exceeding 150°C, and the ratio of an electric conductivity D of the anode electrode 28 to an electric conductivity N of the outer cylinder 26 satisfies the formula: 0.2 ≤ D/N

摘要翻译： 用于加热钢水的等离子体炬20a具有由双层管21构成的外筒26，双层管21的底部被环状地封闭，并且底筒的圆柱形阳极电极28安装在外筒26之间， 阳极电极28和双管21的内部，等离子体焰炬的特征在于，纯铜不用作阳极电极28的材料，该材料具有超过150℃的软化点， 阳极电极28的电导率D与外筒26的电导率N满足公式：0.2≤D/ N <1.0。 等离子体焰炬可以防止溅射引起的阳极电极的熔化损耗和磨损以及阳极电极产生的热量，抑制侧弧产生，延长寿命，稳定铸造操作，提高板坯质量 。