LF-VD精炼过程中GCr15钢中夹杂物的行为

对GCr15在精炼过程产生的夹杂物进行分析，为减少夹杂、提升钢材质量奠定理论基础。采用金相、电子探针、光谱等方法，取样分析了西宁特钢EAF-LF-VD-CC流程冶炼的CA2r15在LFVD精炼时非金属夹杂物数量和尺寸的变化，并确定了各工位的夹杂类型和形成原因。试验结果表明，精炼过程夹杂总量一直呈下降趋势。LF精炼后，各...

Analysis on Behavior of Inclusions of GCr15 in Refining Process of LF-VD

It can provide theoretical basis for inclusion reduction and quality promotion through investigating the behavior of GCr15 inclusions in refining process.Changes in value and size for non-metallic inclusions of GCr15 in LF-VD refining were analyzed and the types and formation reason of inclusions in all stages were discussed for the process of EAF-LF-VD-CC in Xining Special Steel by the methods of metallo-graphy,electron probe and spectrographic analysis.The results show that the number of inclusions is less and less in the refining process.After the LF refining,all inclusions become less apparently and are mainly CaO-Al2O3 and CaO-Al2O3-MgO that have bigger sizes.At the end of VD,the inclusions which are greater than 20 μm have been eliminated completely;the remaining inclusions are mainly CaO-Al2O3 and SiO2-Al2O3 that are less than 10 μm.According to the analysis result,the smelting process should be optimized in order to increase the removal ratio of small size inclusions.At the same time,titanium and nitrogen content should be controlled to avoid the precipitation and agglomeration of TiN inclusions during solidification process.