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利用FactSage软件对28MnCr5钢液和镁铝尖晶石夹杂物的平衡反应进行了分析,当w[Al]在0.02%~0.04%之间,w[Mg]>(0.39~0.42)×10-6的临界范围时开始生成镁铝尖晶石。计算发现:在现有28MnCr5钢精炼工艺条件下,钢液中会不可避免生成镁铝尖晶石夹杂物。当钢液w[Mg]>8.5×10-6时,加入钙不能使其转变成低熔点液态夹杂物;而当钢液w[Mg]小于此值时,增加w[Ca]时,夹杂物按照“镁铝尖晶石→CaO-Al2O3-MgO系液态夹杂物→CaO”路径转变,钢液w[Ca]增加至3×10-6左右时均能将其转化为CaO-Al2O3-MgO系液态夹杂物。计算表明,精炼渣还原提供的[Ca]不能使28MnCr5钢中镁铝尖晶石夹杂物完全变性,须采用向钢液中喂钙线等手段来提高钢液中的钙含量。
The equilibrium reaction between 28MnCr5 molten steel and Mg-Al spinel inclusions was analyzed by FactSage software. When w [Al] was between 0.02% and 0.04%, w [Mg]> 0.39 ~ 0.42 × 10-6 The critical range begins to produce spinel. The calculation shows that Mg-Al spinel inclusions will inevitably form in the molten steel under the existing 28MnCr5 steel refining process. When the molten steel w [Mg]> 8.5 × 10-6, the addition of calcium can not make it into low-melting liquid inclusions; and when the molten steel w [Mg] is less than this value, when w [Ca] According to the path of “MgO-Al2O3 spinel → CaO-Al2O3-MgO liquid inclusions → CaO” path, when the liquid steel w [Ca] is increased to about 3 × 10-6, it can be transformed into CaO-Al2O3- MgO series of liquid inclusions. Calculations show that [Ca] provided by reduction of refining slag can not completely demagnetize Mg-Al spinel inclusions in 28MnCr5 steel. Calcium content in molten steel must be increased by feeding calcium to molten steel.