Case study of severe strip breakage in rolling mill of Thin Slab Casting and Rolling (TSCR) shop of TATA Steel, Jamshedpur

Case studies in engineering failure analysis Pub Date : 2016-04-01 DOI:10.1016/j.csefa.2015.11.002

Diptak Bhattacharya, Avinash Mishra, Ganga Prasad Poddar, Siddhartha Misra

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引用次数: 6

Abstract

In this paper, a case of severe strip breakage in rolling mill of Thin Slab Casting and Rolling (TSCR) shop of TATA Steel, Jamshedpur is presented. Visual observation revealed complete splitting with material missing along the central axis of the strip. Presence of defects in form of white stringers, white patches and holes were observed along the same axis just ahead of split location. Metallurgical analysis revealed association of these defects with slag type foreign materials in the rolled strip. The entrapments of un-deformable materials like slag in slab resulted in the formation of surface discontinuities on the strip on account of differential rolling. The discontinuities manifested in form of holes at lower strip thickness in the later stands of the mill. Inhomogeneous deformation about such holes also resulted in material overlapping. In summary, the breakage of the strip was found to have a strong correlation with the presence of heavy chunk of foreign inclusions from secondary steelmaking sources.

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贾姆谢德布尔塔塔钢铁公司薄板坯连轧(TSCR)车间轧钢机严重带钢断裂案例分析

本文介绍了塔塔钢铁公司贾姆谢德布尔薄板坯连轧车间轧钢机发生的严重带钢断裂事故。目视观察显示，沿带材中轴线完全分裂，材料缺失。在裂口位置前沿同一轴线观察到白色条纹、白色斑块和孔洞等缺陷。金相分析表明，这些缺陷与轧制带材中的渣型异物有关。由于差速轧制，钢渣等不变形物质在板坯中的夹持导致带钢表面不连续现象的形成。这种不连续性在轧机的后期机架中以较低带材厚度的孔洞的形式表现出来。这些孔洞的不均匀变形也会导致材料重叠。总之，发现带钢的断裂与来自二次炼钢源的大块外来夹杂物的存在有很强的相关性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Case studies in engineering failure analysis

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