低硫钢连铸过程结晶器内渣-钢间硫的迁移

Transfer of Sulphur between Flux and Liquid Steel in Mold during Low Sulphur Steel Concasting

试验了低硫高碳钢U71Mn（0．65％～0．73％C，0．006％～0．009％S）、U75V（0．73％～0．76％C，0．004％～0．008％S）和低硫低碳20钢（0．20％～0．22％C，0．005％～0．008％S）与含0．008％～0．011％S的连铸结晶器保护渣之间硫的迁移。结果表明，高碳钢连铸时，结晶器内保护渣中硫含量从0．008％增至0．010％～0．011％，但低碳钢连铸时，保护渣中硫含量从原始的0．011％降至0．009％，因此在连铸低碳钢时，应采用低初始硫含量的保护渣。

The transfer of sulphur between mold flux containing 0. 008% - 0. 011% S and liquid steels including high carbon low sulphur steel- U71Mn （0. 65% - 0. 73% C, 0. 006% - 0. 009% S） and U75V （0. 73% - 0. 76% C, 0.004%- 0.008% S） as well as low sulphur low carbon steel- 20 （0.20% - 0.22% C, 0. 005% - 0. 008% S） has been studied. The results showed that during casting high carbon steels, the sulphur content in mold flux increased from original 0. 008% to 0. 010% -0. 011% , while during low carbon steel casting, the sulphur content in mold flux decreased from original 0. 011% to 0. 009%, therefore during casting low carbon steel, it should be to use low original sulphur content in mold flux.