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                 试验与研究                                                              DOI:10.11973/lhjy-wl240254



                          低牌号无取向电工钢 B 坯增碳的影响因素



                                                朱鹏宏,高兴健,王思琴,雷志亮
                                              (宝钢湛江钢铁有限公司,湛江 524072)

                      摘  要:研究了无取向电工钢不同种类保护渣对钢水增碳的影响,通过对比分析,发现保护渣的
                  成分以及理化性能是决定钢水增碳的主要因素之一,对开浇第一块板坯(B坯) 在浇铸长度上连续取
                  样,得到开浇板坯增碳的主要范围以及变化趋势。采用固定变量的方式分析了开浇工艺对保护渣增
                  碳的影响。结果表明:采用减少保护渣中自由碳的含量、适当降低保护渣的熔点、提升保护渣的黏度,
                  以及保证开浇拉速与过热度的方法可以控制保护渣增碳量。此外,通过试验分析以及生产验证,提
                  出了对开浇初期板坯增碳产生影响的其他关键因素,最后提出了改进建议。
                      关键词: 无取向电工钢;B坯;增碳;保护渣
                      中图分类号:TB31      文献标志码:A    文章编号:1001-4012(2025)01-0010-05

                         Influencing factors of carbon pick-up of low grade non-oriented
                                                 electrical steel B billet

                                        ZHU Penghong, GAO Xingjian, WANG Siqin, LEI Zhiliang

                                    (Baosteel Zhanjiang Iron and Steel Co., Ltd., Zhanjiang 524072, China)
                       Abstract: The influence of different kinds of mold fluxes on the carbon pick-up of molten steel in non-oriented
                  electrical steel was studied. Through comparative analysis, it was found that the composition and physical and chemical
                  properties of casting powder were one of the main factors determining the carbon pick-up of molten steel. Through
                  continuous sampling of the casting length of the first slab (B slab), the main range and change trend of the carbon
                  pick-up of the slab were found. The influence of the pouring process on the carbon pick-up of the casting powder was
                  analyzed by means of fixed variables. The results show that reducing the content of free carbon in the casting powder,
                  appropriately reducing the melting  point of the casting powder, increasing the viscosity of the casting powder, and
                  ensuring the casting speed and superheat could control the carbon pick-up of the casting powder. In addition, through
                  experimental analysis and production verification, other key factors that affected the carbon pick-up of slab at the initial
                  stage of casting were put forward, and suggestions for improvement were put forward finally.
                       Keywords: non-oriented electrical steel; B billet; carbonization; casting powder


                  无取向电工钢是一种在超低碳钢(碳元素质量                          能主要取决于化学成分、晶粒尺寸、晶体织构及钢
                                                                                    [9]
              分数小于10     −4 )中添加质量分数不小于0.5%的Si                  中的夹杂物和析出物 。该钢的化学成分主要分为
              元素的一类特殊钢,主要用于制造各种电机以及变                            3类:第一类为基本合金元素,如Si、Mn、P元素等;
              压器铁芯,是电力、电子和军事工业中不可缺少的重                           第二类为杂质元素,如C、S、O、N、Nb、V、Ti元素等;
              要软磁合金。应国家节能减排的需求,各类家电及                            第三类为特殊合金元素,如Sb、Sn元素等                   [10-11] 。其
              中小型电机更新换代,无取向电工钢作为制造电机                            中,C元素作为杂质元素之一,会极大程度地影响无
              铁芯的重要金属功能材料,具有低铁损、高磁感的                            取向电工钢的磁性能,因此在冶炼生产中,要尽可能
              优点,其需求量逐年提升            [1-8] 。无取向电工钢的磁性           降低钢中C元素的含量。实际生产中,除了冶炼中

                                                                的脱碳控制外,如何避免碳元素的引入也是需要重
                 收稿日期:2024-09-03
                                                                点关注的问题       [12-21] 。笔者以某低牌号无取向电工钢
                 作者简介:朱鹏宏(1993—),男,本科,主要从事无取向电工钢
              产品的质量设计工作,686597@baosteel.com                     板坯为研究对象,结合工业化生产的实际经验,探讨
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