造塊作業の研究(V)

熔鋼の空気による酸化が鋼中非金属介在物におよぼす影響No. 2熔鋼中の各種元素の酸化ならびに鋳込条件の影響

抄録

The non-metallic inclusion in steel is greatly influenced with oxidation of molten steel by air during pit-practice. The authors studied on oxidation of various elements in molten steel during pouring and effect of casting conditions on oxidation.
The results obtained were as follows:
1. Silicon, manganese, aluminium and chrome were oxidized in proportion to content of these elements before pouring.
2. Increased SiO₂ and MnO in steel during pouring were about 3-% and 7-15% of total amount of oxidized silicon and manganese respectively.
3. Increased Al₂O₃ was about 25% of total amount of oxidized aluminium and it was correspond with about 50% of total Al₂O₃ in steel after pouring.
4. Oxidation of chrome was not oxidized strongly in comparison with the other elements, but increased Cr₂O₃ during pouring was correspond with about 50-100% of total Cr₂O₃ in steel after pouring.
5. The molten steel of slow casting velocity was more oxidized heavily than the case of fast casting velocity.
The oxidation of molton steel by air during pouring was influenced with the condition of its stream.