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Title:
IMPROVING METHOD OF LADLE NATURAL OPENING RATE
Document Type and Number:
Japanese Patent JP2015093293
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To make the natural hole-opening rate of a ladle 100% when filling the filled sand to a nozzle of the ladle and perform an operation.SOLUTION: In an improving method of a ladle natural opening rate, when filled sand is filled into a nozzle draining molten metal in a ladle and then an operation is performed using the ladle, the filled sand being filled into the ladle is selected satisfying the following conditions: the hot sample shrinkage ratio is 1.2% or more and 2.5% or less at a temperature range of 1,250°C or higher and 1,350°C or less; and the cold sample shrinkage ratio is 3.0% or more and 10% or less at a temperature range of 1,450°C or higher and 1,550°C or lower. The operation is performed satisfying: Y≤-X+1870, where X≤220, Y≤1700, X is the filled ladle time (min), and Y is the maximum molten steel temperature (°C) in the ladle.

Inventors:
OTA HIROMI
Application Number:
JP2013233065A
Publication Date:
May 18, 2015
Filing Date:
November 11, 2013
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
B22D41/46; B22D11/10
Domestic Patent References:
JP2006198671A2006-08-03
JPH1052751A1998-02-24
JPH0947863A1997-02-18
JP2006297426A2006-11-02
JP2002307161A2002-10-22
JPH11267821A1999-10-05
JPH0929401A1997-02-04
JP2006198671A2006-08-03
JPH1052751A1998-02-24
JPH0947863A1997-02-18
JP2006297426A2006-11-02
JP2002307161A2002-10-22
JPH11267821A1999-10-05
JPH0929401A1997-02-04
Foreign References:
WO2000073000A12000-12-07
US20020128144A12002-09-12
WO2000073000A12000-12-07
US20020128144A12002-09-12
Attorney, Agent or Firm:
Toshio Yasuda
Mikio Yasuda



 
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