60Si2MnA弹簧钢炼钢过程的洁净度变化

摘要/Abstract

摘要： 对“BOF→LF→CC”流程铝脱氧造较高碱度精炼渣工艺生产60Si2MnA弹簧钢冶炼过程的洁净度进行了调研分析，并从理论上分析了冶炼过程钢中T.O、氮含量和夹杂物数量、尺寸及类型的转变过程。结果表明：冶炼过程钢中T.O含量逐渐降低，氮含量增加，盘条中平均w(T.O)=14.5×10-6，w(N)=30.4×10-6。夹杂物类型变化为Al2O3-SiO2→Al2O3-SiO2-MgO-CaO四元复合夹杂物→Al2O3-SiO2-MgO-CaO-CaS五元复合夹杂物。控制钢中w(Al)=0.03 %左右，钙处理后钢水w(Ca)/w(Al)=0.08～0.11，Al2O3夹杂物能得到充分变性，形成的四元夹杂物处于较低熔点区，而五元夹杂物因含较多高熔点CaS而偏离低熔点区。

关键词: 弹簧钢, 铝脱氧, 洁净度, 夹杂物, CaS

Abstract: “BOF→LF→CC”process was adopted to produce aluminium killed 60Si2MnA spring steel, and high basicity refining slag was made to intensify refining, and then the cleanness of steel during steelmaking process was investigated and analyzed, moreover, the changes of the T.O and nitrogen contents as well as the number, size and type of nonmetal inclusions in steel during steelmaking process were analyzed by theory. Results showed that the T.O content decreased and the nitrogen content increased gradually during steelmaking process, as a result, the average mass fraction of T.O and nitrogen in wire rods were 14.5×10-6and 30.4×10-6, respectively. The change in type of inclusion during smelting process was Al2O3-SiO2 →Al2O3-SiO2-MgO-CaO quaternary inclusions →Al2O3-SiO2-MgO-CaO=CaS quinary inclusions. The aluminum mass fraction of steel should be about 0.03% and the w(Ca)/w(Al) should be 0.08－0.11after calcium treatment, thus the Al2O3 could get the full modification and form the the quaternary inclusions which were in the low melting point area, while the quinary inclusions containing too much CaS with high melting point deviated from the low melting point area.

Key words: spring steel, Alkilled, cleanliness, inclusions, CaS

胡阳1，陈伟庆1，韩怀宾2，白瑞娟2. 60Si2MnA弹簧钢炼钢过程的洁净度变化[J]. 炼钢, 2015, 31(6): 34-.

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60Si2MnA弹簧钢炼钢过程的洁净度变化

Change in cleanliness of 60Si2MnA spring steel during steelmaking

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