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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Effect of different refining slag systems on the cleanliness of molten steel for carbon structural steel
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Effect of different refining slag systems on the cleanliness of molten steel for carbon structural steel

机译：不同炼油系统对碳结构钢钢水清洁的影响

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摘要

The effect of two refining slags (A: 1.0-1.8 CaO/Al_2O_3 ratio, 11-20 wt% SiO_2; and B: 1.0-1.2 CaO/SiO_2 ratio, 25-35 wt% Al_2O_3) on the inclusion morphology of a carbon structural steel (Q235B) was studied by controlling the balance between the steel and the refining slag at 1600°C in a Si-Mo resistance laboratory furnace. The results showed that most of the inclusions in the molten steel balanced with slag A were formed by a low-melting CaO-MgO-Al_2O_3-SiO_2 system with a total oxygen content (T[0]) being fixed at 6-13 ppm. The inclusions in liquid steel balanced with the slag B were mostly formed by the CaO-MnO-Al_2O_3-SiO_2 system, with T[0] controlled to 19-26 ppm. The overall size of the inclusions under balance conditions was higher in the steel reacted with the slag B than that reacted with slag A, with the latter showing more inclusions smaller than 3 μm. In order to generate a large number of spherical CaO-MgO-Al_2O_3-SiO_2 inclusions smaller than 3 urn while decreasing the T[0] in the resulting steel, the composition of slag A should be used. This composition allowed improving the cleanliness of the slab, and is also advantageous for the castability of the molten steel.
机译：在硅钼电阻实验室炉中，通过控制1600°C下钢与精炼渣之间的平衡，研究了两种精炼渣（A:1.0-1.8 CaO/Al_2O_3比值，11-20 wt%SiO_2；B:1.0-1.2 CaO/SiO 2比值，25-35 wt%Al_2O_3）对碳结构钢（Q235B）夹杂物形态的影响。结果表明，钢水中的夹杂物大多由低熔点CaO-MgO-Al_2O_3-SiO 2系统形成，总氧含量（T[0]）固定在6-13 ppm。钢水中与B渣平衡的夹杂物主要由CaO-MnO-Al_2O_3-SiO 2体系形成，T[0]控制在19-26 ppm。在平衡条件下，与炉渣B反应的钢中夹杂物的总尺寸高于与炉渣A反应的钢中夹杂物的总尺寸，后者显示出更多小于3μm的夹杂物。为了生成大量小于3μm的球形CaO-MgO-Al_2O_3-SiO_2夹杂物，同时降低所得钢中的T[0]，应使用炉渣A的成分。这种成分可以提高板坯的清洁度，也有利于钢水的浇注性。

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