发明名称 |
PLASMA TORCH USED FOR HEATING MOLTEN STEEL |
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 electrode 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.degree.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 .ltoreq. D/N < 1.0. The plasma torch prevents the melting loss and wear of the anode electrode caused by the splashes and the heat produced in the anode electrode, suppresses generation of a side arc, shows an extended life, and stabilizes the casting operation and improves the quality of the slab.
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申请公布号 |
CA2437591(C) |
申请公布日期 |
2007.09.25 |
申请号 |
CA20022437591 |
申请日期 |
2002.02.14 |
申请人 |
NIPPON STEEL CORPORATION |
发明人 |
KAWACHI, TAKESHI;MITAKE, HIROYUKI;TANAKA, KAZUHISA;NISHIHARA, RYOJI;ASANO, MITSUJI;HIRAMOTO, YUJI;FUKUNAGA, SHINICHI;YASUMITSU, KAZUNORI |
分类号 |
H05H1/34;B22D11/10;B22D11/11;B22D41/01;B22D41/015;H05B7/00;H05B7/18;H05H1/28;H05H1/48 |
主分类号 |
H05H1/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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