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Control of brittle inclusions in GCr15 bearing steel
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1, the essence of the slag system. Select CaO (40-60%)-Al2O3 (20-40%)-SiO2 (4-10%)-MgO (5-12%) slag system; domestic exercise bearing steel is the primary choice; There are two types of high alkalinity (CaO/SiO2>3) and low alkalinity (CaO/SiO2≈2); high alkalinity (CaO/SiO2>3) slag system is selected; high alkalinity is perfect in end steel The content is low; the scale of the impurities is also very. The actual tourmaline Al2O3; the MgO content is reduced; the slag fluidity can be improved; the ability and speed of the slag adsorption of the slag can be improved; the slag component can be found after proper adjustment; the overall brittleness of the steel The level of the scorpion is very low and stable.
2, refractory materials. Exercise steel steel temperature of up to 1600 ° C; will corrode and steel directly touch the ladle, center bag, long nozzle, etc. Therefore, high alkalinity exercise should use high magnesium oxide data; center coating is High-magnesium oxide data, low-alkalinity exercise should use chromium oxide, high alumina data. The continuous casting nozzle uses zirconia-containing materials.
3, vacuum essence. Under VD vacuum degassing conditions; properly extend the blowing argon mixing time; can make the reaction between slag and molten steel completely; non-metallic impurities are easier to float off, properly extend the intensity of argon blowing; It is also useful to remove the impurities. The principle of the mixing strength is not to cause the steel refractory materials to fall off due to excessive smashing and contaminating the molten steel; the molten steel is not exposed to the air and oxidize; not the slag is rolled into the molten steel and cannot be floated in time. Removed; should be adjusted in principle.
In addition, the total oxygen in the steel should be manipulated during the exercise to make [O] ≤ 8 × 10-6, improve the purity of the molten steel; in July 2007, the domestic Xingcheng special steel passed the above methods; better control of the GCr15 bearing steel Brittle scorpion; satisfied with the production needs.
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