Title:
METHOD FOR PRODUCING ALLOY INGOTS
Document Type and Number:
WIPO Patent Application WO/2011/007578
Kind Code:
A1
Abstract:
Provided is a method for producing alloy ingots involving: a step in which alloy starting materials are introduced into the cold crucible of a cold crucible-type induction melting device and a molten pool is formed from the alloy starting materials by induction heating in an atmosphere of inert gas; a step in which a first refining agent is added to the molten pool to reduce the content of at least phosphorus among the impurity elements present in the molten pool while continuing induction heating; and a step in which the melt with reduced phosphorus content is solidified to form alloy ingots. The first refining agent is a mixture of Ca metal and a flux, wherein the flux contains CaF2 with CaO and/or CaCl2. The ratio of the total weight of the CaO and CaCl2 to the weight of the CaF2 is 5-30 wt% and the ratio of the weight of the Ca metal to that of the molten pool is 0.4 wt% or more.
Inventors:
NAKAYAMA JUMPEI
KUSAMICHI TATSUHIKO
KUSAMICHI TATSUHIKO
Application Number:
PCT/JP2010/004615
Publication Date:
January 20, 2011
Filing Date:
July 15, 2010
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
NAKAYAMA JUMPEI
KUSAMICHI TATSUHIKO
NAKAYAMA JUMPEI
KUSAMICHI TATSUHIKO
International Classes:
C21C7/00; C22B9/22; C21C7/04; C21C7/064; C21C7/068; C22B9/10; C22C1/02; C22C33/04
Domestic Patent References:
| WO2005049882A1 | 2005-06-02 |
Foreign References:
| JPH05295470A | 1993-11-09 | |||
| JP2000219922A | 2000-08-08 |
Other References:
Y. NAKAMURA ET AL., REFINING OF 18%CR-8%NI STEEL WITH CA-CAF2 SOLUTION, TRANSACTION ISIJ, vol. 16, 1976, pages 623
IWASAKI; SAKURAYA; FUKUZAWA, PRODUCTION OF SUPER-LOW PHOSPHORUS STAINLESS STEEL BY COLD CRUCIBLE LEVITATION MELTING: IRON AND STEEL, vol. 88, no. 7, 2002, pages 413
R. G. WARD, JISI, vol. 201, 1963, pages 11
IWASAKI; SAKURAYA; FUKUZAWA, PRODUCTION OF SUPER-LOW PHOSPHORUS STAINLESS STEEL BY COLD CRUCIBLE LEVITATION MELTING: IRON AND STEEL, vol. 88, no. 7, 2002, pages 413
R. G. WARD, JISI, vol. 201, 1963, pages 11
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
Etsuji Kotani (JP)
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