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通过多种分析手段系统研究了40Cr冷镦钢LF精炼过程夹杂物的变化,得到LF精炼过程钢中夹杂物面积比与T.O含量变化规律相一致,从LF进站到LF出站,钢中夹杂物面积比由1.41%减小到0.45%;并且LF精炼能够有效地去除当量直径大于10μm的大颗粒夹杂物,绝大部分夹杂物的当量直径都落在2~5μm。LF采用高碱度、强还原性炉渣精炼,结合钙处理技术,可以有效地使钢中Al2O3夹杂转变为MgO-Al2O3系、CaO-Al2O3系和CaO-MgO-Al2O3系夹杂,改善钢的可浇性和冷镦性能;但需进一步合理的控制钙处理工艺,减少钢液的卷渣和二次氧化,提高钢液的洁净度。
The change of inclusions in LF refining process of 40Cr cold-heading steel was systematically studied by a variety of analytical methods. The results show that the area ratio of inclusions in LF refining process is consistent with the change of TO content. From LF entry to LF exit, Material area ratio decreased from 1.41% to 0.45%; and LF refining can effectively remove large particle inclusions with an equivalent diameter of more than 10μm, most of the inclusions have equivalent diameters of 2 ~ 5μm. LF using high alkalinity, strong reductive slag refining, combined with calcium treatment technology, can effectively change the Al2O3 inclusions into steel MgO-Al2O3, CaO-Al2O3 and CaO-MgO-Al2O3 inclusions to improve the steel can be poured And cold forging performance; but need to be further reasonable control of calcium treatment process to reduce the liquid steel slag and secondary oxidation, improve the cleanliness of molten steel.