精炼渣对SUS444铁素体不锈钢中夹杂物的影响

摘要/Abstract

摘要： 在1 873 K，MgO坩埚内进行了VOD精炼渣与SUS444铁素体不锈钢之间的脱氧平衡试验，考察了精炼渣对不锈钢中T.O含量及夹杂物组成、数量和尺寸分布的影响。结果表明，脱氧终点钢中w(T. O)=0.006 3 %～0.007 4 %，提高精炼渣碱度，降低渣中Al₂O₃的活度，有利于降低钢中T.O含量。精炼渣碱度增加，试样中单位面积夹杂物的个数及夹杂物的平均面积分数都减小。降低渣中Al₂O₃含量，夹杂物平均粒径也降低。加入脱氧合金后，钢中夹杂物主要为Al₂O₃、MgO×Al₂O₃及含有少量SiO₂、MnO的复合氧化物；钙处理后，钢中夹杂物主要为球形的MgO×Al₂O₃-CaO。随着精炼渣中的增加，MgO×Al₂O₃夹杂物中随之增加。根据试验，R=3.5、w(Al₂O₃)=10 %、w(MgO)= 10 %、w(CaF₂)= 5 %的精炼渣具有良好的精炼效果。

关键词: VOD精炼渣, 铁素体不锈钢, 脱氧, 夹杂物

Abstract: The equilibrium experiment between VOD refining slag and SUS444 ferrite stainless steel was carried out in the MgO crucibles at 1873 K. The influence of refining slag on the total oxygen content in stainless steel and the composition, quantity and size distribution of inclusions were investigated. It is concluded that the mass fraction of T. O in the deoxidized steel sample ranged from 0.006 3 %- 0.007 4 %. The T. O content in the steel decreased with the increasing of refining slag basicity and the decreasing of Al₂O₃ activity in the slag. With the increasing of basicity of refining slag, the number of inclusions per unit area as well as the average area fraction of inclusions in the steel sample decreased during the refining process. The mean particle size of inclusions reduced with the decreasing of Al₂O₃ content in the slag. After adding the deoxidizing alloy, the inclusions in the sample were Al₂O₃ and MgO×Al₂O₃ and complex oxides containing a small amount of SiO₂ and MnO. After calcium treatment, the main inclusions in steel were spherical MgO·Al₂O₃-CaO. The mole ratio of MgO to Al₂O₃ in the MgO×Al₂O₃ inclusions, ， increased with increasing the activity ratio of MgO to Al₂O₃ in the refining slag, . By present experiments, the refining slag, which the composition was R=3.5, w(Al₂O₃)=10 %, w(MgO)= 10 %, w(CaF₂)= 5 %, had a good refining effect.

Key words: VOD refining slag, ferrite stainless steel, deoxidation, inclusions

杨宏伟,苏丽娟1，李光强1，陈兆平2，皮朝辉1，周耀1 . 精炼渣对SUS444铁素体不锈钢中夹杂物的影响[J]. 炼钢, 2014, 30(4): 42-46.

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精炼渣对SUS444铁素体不锈钢中夹杂物的影响

Influence of refining slag on the inclusions in SUS444 ferrite stainless steel

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