Q235B中厚板表面气泡缺陷形成机理研究

物理测试, 2008, 26(1): 14-0.

Q235B中厚板表面气泡缺陷形成机理研究

1.1.北京科技大学材料科学与工程学院，北京 100083；2.太钢集团临汾钢铁有限公司, 山西　临汾　041000

1.1.School of Material Science and Engineering ,Beijing University of Science and Technology ,Beijing 100083,China；2. Linfen Iron &

Steel Co, Taiyuan Iron &

Steel Group Co, Linfen 041000，Shanxi. China

关键词： Q235B中厚板 , bubble defect , nonmetallic inclusions

Analysis on Formation Mechanism of Surface BubbleDefect of Q235B Plate

DUAN Shuangxia , SUN Jianlin , FU Pingyuan , ZANG Xiaojun

Keywords： Q235B medium and heavy plate , 气泡缺陷 , 非金属夹杂物

对Q235B中厚板表面缺陷处的显微组织、非金属夹杂物等进行了金相组织和扫描电镜观察及能谱分析。实验发现：钢水脱氧不良；缺陷周围分布着大量的氧化铁质点和非金属夹杂物。可见，这类缺陷是连铸坯上气泡和含夹杂的气囊在加热和轧制过程中胀裂后形成的，称气泡类缺陷。为此提出了相应的改进措施。

The surface defect on medium and heavy plate Q235B was investigated by means of the optical microscopy，scanning electron microscopy and energy spectrum analysis in this paper. The results show that the deoxidizing process of molten steel was imperfectly and a great amount of nonmetallic inclusions and particle of iron oxide existed around the defects. Evidently, the reason of the bubble defects were nonmetallic inclusions and bubbles formed in continuous casting slab, which expand during reheating and rolling. The surface defect belongs to bubble defect. The improvement measures for elimination of these defect are proposed.

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