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US 11,453,048 B2Granted
Mold flux for continuous casting and continuous casting method
AssigneeNippon Steel Corporation
InventorsMasahito Hanao, Daiki Naito
Life of this patent
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Abstract
A mold flux for continuous casting has a base material composition containing 25 to 60 mass % of CaO, 15 to 45 mass % of SiO2, 5 to 25 mass % of F, 0.2 to 1.0 mass % of S, and 0 to 20 mass % of a total of Li2O, Na2O, and K2O, and in the base material composition, f(1) is 0.90 to 1.90, f(2) is 0.10 to 0.40, f(3) is 0 to 0.40, and a total of CaO, SiO2, F, S, Li2O, Na2O, and K2O is 90 to 100 mass %.
Claims12
A mold flux for continuous casting which has a base material composition containing:
- 25 to 60 mass % of CaO;
- 15 to 45 mass % of SiO2;
- 5 to 25 mass % of F;
- 0.5 to 1.00 mass % of S;
- and
- 0 to 20 mass % of a total of Li2O, Na2O, and K2O,
- wherein in the base material composition,
- f(1) represented by Formula 1 is 0.90 to 1.90,
- f(2) represented by Formula 2 is 0.10 to 0.40,
- f(3) represented by Formula 3 is 0 to 0.40, and
- a total of CaO, SiO2, F, S, Li2O, Na2O, and K2O is 90 to 100 mass %,
- f(1)=(CaO)h/(SiO2)h (Formula 1)
- f(2)=(CaF2)h{(CaO)h+(SiO2)h+(CaF2)h} (Formula 2)
- f(3)=(MF)h/{(CaO)h+(SiO2)h+(MF)h}tm (Formula 3)
- where (CaO)h, (SiO2)h, (CaF2)h, and (MF)h in Formulae 1 to 3 are calculated as follows,
- (CaO)h=WCaO-(CaF2)h×0.718 (Formula 4)
- (SiO2)h=WSiO2 (Formula 5)
- (CaF2)h=(WF−WLi2O×1.27−WNa2O×0.613−WK2O×0.403)×2.05 (Formula 6)
- (MF)h=WLi2O×1.74+WNa2O×1.35+WK2O×1.23 (Formula 7)
- where Wi represents a percentage by mass of each component i.
17 more elements
Dependencies are inferred from the claim text.