Title:
METHOD OF MELTING HIGH CLEANLINESS LOW CARBON STEEL
Document Type and Number:
Japanese Patent JP3674422
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a melting of a high cleanliness low carbon steel having pretreatment load lower than that of the conventional method without developing the operational trouble in a vacuum degassing treatment.
SOLUTION: When the low carbon molten steel is decarburized to 0.02-0.05 mass% carbon concentration by using a primary refining furnace for decarburizing the molten steel under atmospheric pressure and successively, using a vacuum degassing apparatus for again refining the molten steel from the primary refining furnace under vacuum state, in order, the decarburizing to 0.02-0.05 mass% carbon concentration in the molten steel is executed in the primary refining furnace. Further, carburizing-treatment is applied at the tapping of the steel and the tapped molten steel is vacuum-decarburized and deoxidized in the vacuum-degassing apparatus, and after making the soluble oxygen concentration to ≤0.02 mass%, further deoxidizing agent is added to execute the deoxidizing treatment.
Inventors:
Takashi Yamauchi
Seiji Nabeshima
Seiji Nabeshima
Application Number:
JP33405299A
Publication Date:
July 20, 2005
Filing Date:
November 25, 1999
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
B22D1/00; C21C7/00; C21C7/04; C21C7/06; C21C7/068; C21C7/10; (IPC1-7): C21C7/06; B22D1/00; C21C7/00; C21C7/04; C21C7/068; C21C7/10
Domestic Patent References:
| JP8291317A |
Attorney, Agent or Firm:
Yoshio Kosugi
Masaki Yamada
Masaki Yamada
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