60Si2MnA弹簧钢炼钢过程的洁净度变化  

Change in cleanliness of 60Si2MnA spring steel during steelmaking

作　　者：胡阳[1] 陈伟庆[1] 韩怀宾 白瑞娟[2] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]河南济源钢铁集团有限公司,河南济源459000

出　　处：《炼钢》2015年第6期34-39,共6页Steelmaking

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。控制钢中训（Al）=0．03％左右，钙处理后钢水w（Ca）／w（Al）=0．08～0．11，Al2O33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。＂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 → Al2 O3-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.

关 键 词：弹簧钢 铝脱氧 洁净度 夹杂物 CAS 

分 类 号：TF762.5[冶金工程—钢铁冶金]