冷延用低炭素鋼鋳片中の非金属介在物におよぼす製鋼鋳造条件の影響

概要

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In order to produce continuously-cast slabs provided for mother material of cold rolled sheet, liquid steels were deoxidized with deoxidizers of Al-Si-Mn system. Non-metallic inclusions of manganese-silicate and alumina were studied with reference to its steelmaking and casting conditions. The results are as follows. (1) To reduce the amount of manganese-silicate inclusion, (a) keep the (blow-off [C]×(T-Fe)) higher, (b) keep the yield of silicon added as deoxidizers at tapping more than 95%, (c) furnish tundish-dam, and (d) keep the casting speed higher. (2) To reduce the amount of alumina, (a) keep the blow-off carbon content higher, (b) reduce Al/Si ratio of the deoxidizers added at tapping, (c) keep the blow-off temperature higher, and (d) keep the casting speed higher. As stated above, steelmaking conditions have a strong connection with the non-metallic inclusions. Therefore, the main source of inclusion is considered to deoxidation products.
社団法人日本鉄鋼協会の論文
1974-08-01