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US 2023/0257839 A1Published application
A method of casting a steel semi-product with high titanium content
AssigneeArcelorMittal
InventorsFrédéric BONNET, Valérie DAESCHLER, Thierry MASTRORILLO
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Abstract
A method of casting a steel semi-product from a liquid steel, the steel semi-product having a targeted composition in titanium of at least 3.5% in weight.
Claims16
1-15. (canceled)
A method of casting a steel semi-product from a liquid steel, the steel semi-product having a targeted composition in titanium of at least 3.5% in weight, the method comprising the following steps:
- A) adding aluminium to the liquid steel so that liquid steel contains at least 0.1% by weight of aluminium;
- B) adding mineral components to the liquid steel, the mineral compounds containing CaF2 and aluminium and calcium and optionally magnesium, to reach and maintain a slag with a slag composition wherein the ratio of CaO versus Al2O3 (CaO/Al2O3) is from 0.7 to 2 and the slag contains up to 25% by weight of CaF2;
- C) adding titanium to the liquid steel to reach the targeted composition;
- and
- D) casting the steel in the form of a semi-product.
2 more elements
A steelmaking slag having the following composition, expressed in content by weight:
- 35%≤CaO≤55%,
- 15%≤Al2O3≤55%,
- while satisfying 0.7≤CaO2/Al2O3≤2,
- 0% ≤MgO≤15%,
- TiOx<20%
- less than 1% of each of the following compounds B2O3, SiO2, CrOx, MnO, NiO, FeOx, S,
- 6%≤CaF2≤12%
- remainder being oxides resulting from the impurities present in the molten metal.
5 more elements
Dependencies are inferred from the claim text.