Title:
HEAT INSULATING BOARD
Document Type and Number:
Japanese Patent JP2014195824
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a heat insulting board which makes it possible obtain steel ingots having excellent fatigue characteristics by surely keeping the temperature of molten steel in a mold and inhibiting the aggregation of alumina-based inclusions to finely disperse them.SOLUTION: In a heat insulating board 1 which is used to keep the temperature of a steel ingot riser part 5 of a mold 14 at the time of charging molten steel 11 from below to produce steel ingots 4, the heat insulating board 1 has a two-layer structure comprising an upper layer part 3 and a lower layer part 2. The lower layer part 2 contains CaSi, FeO, and MnO, and the balance including at least one of SiO, C, and AlO. A content of Mt.CaSi (metal CaSi) in the CaSi contained in the lower layer part 2 is 40% (by mass, the same applies hereinafter) or more and 65% or less. Oxygen is contained in the FeO and MnOcontained in the lower layer part 2 in an amount of 4% or more and 13% or less. A content of CaSi having a particle size of 0.6 mm or more and 3.0 mm or less in the CaSi is 30% or more and 95% or less.
Inventors:
TOBIMATSU HARUKI
NAGAO MOTOHIRO
KAMIYAMA TAIICHI
IWANAGA KOJI
DEURA TETSUSHI
WATANABE DAISUKE
SHIMAMOTO MASAKI
FUJII TOMORO
NAGAO MOTOHIRO
KAMIYAMA TAIICHI
IWANAGA KOJI
DEURA TETSUSHI
WATANABE DAISUKE
SHIMAMOTO MASAKI
FUJII TOMORO
Application Number:
JP2013073430A
Publication Date:
October 16, 2014
Filing Date:
March 29, 2013
Export Citation:
Assignee:
KOBE STEEL LTD
SINTOKOGIO LTD
SINTOKOGIO LTD
International Classes:
B22D7/10; B22C9/08
Attorney, Agent or Firm:
Toshio Yasuda
Mikio Yasuda
Mikio Yasuda
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