A Typical Failure Analysis of Medium Carbon Hot Rolled Strips
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Medium carbon hot rolled steels are used for wide range of engineering applications. Normally, MC 55 (C: 0.51–0.60 wt.%) grade is used in fabricating various components for automobile and textile industries. Such high-end applications demand superior steel cleanliness to eliminate risk of cracking during cold rolling/forming operations. This article attempts to identify the origin of defects obtained during cold rolling. It has been established that higher Al (~0.06%) and N (~76 ppm) contents in the steel along with excessive segregation of carbon, and the presence of inclusions such as aluminium oxides and MnS were responsible for inadequate cold reducibility, causing crack formation in the sheet material.
KeywordsMedium carbon steel MC 55 Hot rolled coils Crack Hardness
The author wishes to thank the management of the Research & Development Centre for Iron and Steel (RDCIS), the Rourkela Steel Plant (RSP), and the Steel Authority of India Limited (SAIL) for giving permission to publish this study.
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