MOLD POWDER FOR CONTINUOUSLY CASTING STEEL

PROBLEM TO BE SOLVED: To prevent the occurrence of breakout and to improve the quality of a cast slab by using a mold powder having a specific composition and restraining the occurrence of surface skin at the time of continuously casting a Cr-containing steel, B-containing steel or Cr-B-containing s...

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Bibliographic Details
Main Authors KAWABE YOICHIRO, YAMAMURA TAKASHI, MORITA AKIHIRO, OMOTO TOMOAKI
Format Patent
LanguageEnglish
Published 02.12.1997
Edition6
Subjects
CASTING
CASTING OF METALS
CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
PERFORMING OPERATIONS
POWDER METALLURGY
TRANSPORTING
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Summary:PROBLEM TO BE SOLVED: To prevent the occurrence of breakout and to improve the quality of a cast slab by using a mold powder having a specific composition and restraining the occurrence of surface skin at the time of continuously casting a Cr-containing steel, B-containing steel or Cr-B-containing steel. SOLUTION: The composition of the mold powder is by wt.% of 50-90% basic raw material, <=25% silica raw material, 2-15% fluoride, 3-5% aluminum oxide raw material, 2-3.8% carbon powder and 0.7-1.3 ratio of CaO/SiO2 and substantially 0-2% Na2 O. Simultaneously, the solidification temp. of the powder having this composition is in the range of 1040-1180 deg.C and the viscosity η (Poise) at 1300 deg.C is made to satisfy the condition of the equation. Then, as means for obtaining this composition and viscosity, it is desirable to contain <=3% LiO2 without blending Na2 CO2 , NaF, Na3 AlFe in the raw material constituting the powder and use the powder of 0.45-0.65kg/ton of steel.
Bibliography:Application Number: JP19960124858