Title:
METHOD FOR PRODUCING METAL INGOT
Document Type and Number:
WIPO Patent Application WO/2018/190419
Kind Code:
A1
Abstract:
[Problem] To provide a method for producing a metal ingot, the method being capable of preventing impurities contained in molten metal in a hearth from mixing into the ingot. [Solution] A method for producing a metal ingot using an electron-beam melting furnace that is provided with an electron gun and a hearth for storing molten metal of metal raw materials, wherein the metal raw materials are supplied to the position of a supply line disposed along a second sidewall of the hearth for storing the molten metal of the metal raw materials. A first irradiation line, which is disposed along the supply line on the surface of the molten metal and is disposed closer to the center of the hearth than the supply line, is irradiated with a first electron beam. As a result, the surface temperature (T2) of the molten metal in the first irradiation line is more elevated than the average surface temperature (T0) on the whole surface of the molten metal in the hearth, so as to form a first molten metal flow flowing from the first irradiation line towards the supply line on the surface layer of the molten metal.
More Like This:
Inventors:
FUNAGANE HITOSHI (JP)
HAMAOGI KENJI (JP)
HAMAOGI KENJI (JP)
Application Number:
PCT/JP2018/015536
Publication Date:
October 18, 2018
Filing Date:
April 13, 2018
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22B9/22; B22D11/00; B22D11/041; B22D21/06; B22D27/02; B22D43/00; C22B34/12; C22C14/00
Foreign References:
| JP2004276039A | 2004-10-07 | |||
| JP2013001975A | 2013-01-07 | |||
| JP2004232066A | 2004-08-19 |
Other References:
See also references of EP 3611277A4
Attorney, Agent or Firm:
KAMEYA, Yoshiaki et al. (JP)
Download PDF: