Steel manufacturing method

Abstract

To provide a method of producing steel allowing for enhancing cleanliness of in-tundish molten steel in unsteady time so as to suppress the cleanliness of the molten steel in unsteady time from having effects during steadiness.SOLUTION: A method of producing steel includes continuous-continuous casting satisfying expressions [1] and [2] at a start of injecting molten steel from a ladle into a tundish, a≤h / h0≤0.45...[1] a=[VD2 / 2.05{(ρS-ρP)g / ρS}1 / 2]2 / 5 / h0...[2]; in which when expression [1] is satisfied, a molten-steel injection flow from the ladle has at a tundish bottom a vertical flow velocity vb satisfying expressions [3] and [4], vb≤9.91...[3] and vb=[2g{H0+H-(h-h1)}]1 / 2...[4], and a molten-steel flow along a tundish bottom surface at a tundish side or weir nearest to the molten-steel injection flow from the ladle has a velocity vw satisfying expressions [5] and [6], vw≤0.62...[5] vw=3.5{(Hr0)2 / r}(2 gH0)1 / 2...[6].SELECTED DRAWING: None

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