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首先采用Fact Sage热力学软件对Ca O-Al2O3-Si O2-Mg O(10%)系夹杂物的塑性化控制进行了讨论,并进行了顶渣成分对夹杂物成分影响的实验室和工业试验研究。研究表明:在Ca O-Al2O3-Si O2-Mg O(10%)相图中,当w(Ca O)=8%~48%,w(Si O2)=35%~75%,w(Al2O3)=0~32%时,夹杂物处于塑性区域。随着顶渣中Al2O3含量的升高,帘线钢夹杂物中的Al2O3含量也随之升高,且夹杂物的分布也随顶渣中w(Al2O3)的升高而变得分散。综合实验室试验研究和工业试验生产结果,通过调节顶渣的成分,将顶渣碱度控制在0.7~0.9,w(Al2O3)=2%~5%时,可控制钢中非金属夹杂物的塑性化,断丝率降低了30%,达到了提高盘条质量的目的。
First, the plastic control of inclusions CaO-Al2O3-Si O2-MgO (10%) was discussed by using Fact Sage thermodynamic software, and the laboratory and industrial experiments on the influence of top slag composition on the composition of inclusions were carried out . The results show that when w (CaO) = 8% ~ 48%, w (Si O2) = 35% ~ 75%, w ) = 0 ~ 32%, inclusions in the plastic zone. With the increase of Al2O3 content in the top slag, the content of Al2O3 in the inclusions of cord steel also increases, and the distribution of inclusions also disperses with the increase of w (Al2O3) in the top slag. According to the results of laboratory tests and industrial tests, the top slag basicity can be controlled at 0.7-0.9 and w (Al2O3) = 2% ~ 5% by adjusting the composition of the top slag, which can control the nonmetallic inclusions in the steel Plasticization, broken wire rate decreased by 30%, to achieve the purpose of improving the quality of the wire rod.