特厚板中碳低合金钢用结晶器保护渣的研制与应用  

Development and application of mould slag for special thick slab of mediumcarbon low-alloy steel

作　　者：陈永艳 李晓阳 赵春宝 徐金岩 王岩 袁永旗 CHEN Yongyan;LI Xiaoyang;ZHAO Chunbao;XU Jinyan;WANG Yan;Y-UAN Yongqi(Xixia Longcheng Metallurgical Material Co., Ltd., Xixia 474500, China;Nanyang Hanye Special Steel Co., Ltd., Xixia 474500, China)

机构地区：[1]西峡龙成冶金材料有限公司,河南西峡474500 [2]南阳汉冶特钢有限公司,河南西峡474500

出　　处：《炼钢》2018年第3期43-47,72,共6页Steelmaking

摘　　要：特厚板中碳低合金钢的浇铸,因钢种中合金元素含量高,出现纵裂纹、横裂纹的缺陷率大,为降低缺陷率,通过优化连铸保护渣来解决当前存在的问题:1)为保证良好的控制传热效果,采取较高的碱度,控制二元碱度w(CaO)/w(SiO_2)在1.0~1.2,同时引入含MnO_2的材料进行着色;2)因拉速低,为防止深振痕产生,采用较高的黏度(1 300℃下0.2~0.3Pa·s);3)为保证良好的流动性及控制好合适的渣层结构,采取合理的配碳结构(2.5%炭黑+4%石墨),及合适的熔化温度(1 140~1 180℃);4)提高保护渣在使用过程的稳定性,防止变性,引入含B_2O_3、BaO类材料,同时采取混合基料。通过上述措施,成功研制出了满足特厚板中碳低合金钢浇铸的连铸保护渣,使铸坯裂纹缺陷率由之前的30%降低到1%以下。Because of high content of alloying elements in steel, medium-carbon low-alloy steel of special thick slabs had large defect rates of longitudinal crack cracks and transverse cracks. To reduce the defect rates, the methods of optimizing mould slag were adopted. 1）To ensure good control of heat transfer effect, a higher basicity was obtained by controlling the binary basicity w （CaO）/ w （Si02） in 1.0- 1.2, and the MnO2-containing material was introduced for coloring. 2）Because of low casting speed, high viscosity （0.2 - 0.3 Pa.s at 1 300 ℃ ） was used for preventing deep vibration marks. 3）A reasonable carbon structure （2.5 % carbon black ＋ 4 % Graphite） and appropriate melting temperature （1 140 - 1 180 ℃ ） were adopted to ensure good fluidity and control the proper slag layer structure. 4）The stability of the mould slag was improved in order to prevent denaturation, through the B203 and BaO materials and mixed-base materials were taken. Through the implementation of these measures, the continuous casting mould slag used in medium-carbon lowalloy steel of special thick slabs had bseen successfully developed, the defect rate of slab cracks reduced from 30 % to less than 1%.

关 键 词：特厚板中碳低合金钢 保护渣 纵裂纹 横裂纹 

分 类 号：TF777[冶金工程—钢铁冶金]