高强冷镦钢LF精炼过程夹杂物的变化行为

摘要/Abstract

摘要： 通过多种分析方法系统研究了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与T[O]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ECD>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范围。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。

关键词: 高强冷镦钢, LF精炼, 钙处理, 夹杂物, 变化行为

Abstract: In this paper , the change of inclusions in 40Cr cold heading steel during LF refining was systematically studied by a variety of analysis methods , it was found that the area of inclusions and total O in steel changed consistently during LF refining , inclusion’s area ratio in steel was reduced from 1.41% to 0.45% after LF refining ; And LF refining could effectively remove the large inclusions whose equivalent diameter ECD>10μm , most of the equivalent diameter of inclusions are fall in the range of 2 ~ 5μm . Moreover, when high basicity and highly reductive slag was used in LF refining, combining with calcium treatment technology, it could effectively transfer Al₂O₃ inclusions to MgO-Al₂O₃ system、CaO-Al₂O₃system and CaO-MgO-Al₂O₃ system inclusions, therefore, the casting performance and cold-flow properties of steel were improved; But calcium treatment process is necessary to be controlled more reasonably in order to reduce the liquid steel slag and secondary oxidation and improve cleanliness of molten steel.

Key words: High strength cold heading steel, LF refining, Calcium treatment, Inclusions, Change behavior

陆鹏雁、吴华杰、岳峰. 高强冷镦钢LF精炼过程夹杂物的变化行为[J]. 炼钢.

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高强冷镦钢LF精炼过程夹杂物的变化行为

Change Behavior of Inclusions in High Strength Cold Heading Steel during LF Refining

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