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ISSN Print: 2381-1072 ISSN Online: 2381-1080

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Metallurgical Investigation of Incidence to Cracked Round Corner Square Bloom (RCS) of Wheel and Axle Grade Steel

Engineering and Technology
Vol.3 , No. 5, Publication Date: Sep. 29, 2016, Page: 93-99

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Authors

[1]	P. Saravanan, Research and Development Centre for Iron and Steel, Steel Authority of India Limited (SAIL), Ranchi, India.
[2]	Bhawna Khalkho, Research and Development Centre for Iron and Steel, Steel Authority of India Limited (SAIL), Ranchi, India.
[3]	S. Srikanth, Research and Development Centre for Iron and Steel, Steel Authority of India Limited (SAIL), Ranchi, India.
[4]	Atul Saxena, Research and Development Centre for Iron and Steel, Steel Authority of India Limited (SAIL), Ranchi, India.

Abstract

The defective Wheel and Axle (WAP) grade of Round Corner Square (RCS) bloom steel sample with surface cracking was investigated concurrently using optical emission spectroscopy (OES) and light optical microscopy coupled with scanning electron microscopy. The incidence of extensive decarburization and grain coarsening at the crack surfaces, the presence of fragmented oxide scale debris within the cracks and the occurrence of massive subsurface entrapments of manganese silicate inclusions associated with the crack like features in the WAP grade of RCS bloom sample clearly indicate the pre-existence of these defects in the input ingots and point to their possible origin in steel making and ingot casting.

Keywords

Round Corner Square (RCS) Bloom, Wheel and Axle (WAP) Grade Steel for Railways, Non-metallic Inclusion, Decarburization, SEM-EDAX

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