"Analysis of Subsurface off Corner Cracks in Continous Cast Steel Billets "

by "Diti Garg, Piched P, Teerapong B, Nikorn S2, R B V Ramana "

Publisher - "Tata Steel Limited, Jamshedpur, India and NTS & TSTH, Chonburi, Thailand "

Category - Engineering & IT

"Subsurface off corner cracks in high carbon steel billets (0.60 – 0.85% C) was a concern at NTS, TSTH. These cracks, 2 to 8 mm beneath the surface, were associated with longitudinal surface depressions. These were found at off corner locations and were usually accompanied by bulging of the billet face. In this work, the influence of operating and metallurgical factors that caused off corner depression and bulging below the mould were examined. Mold water flow rate, casting speed, casting flux, foot roller gap and alignment were identified as major control parameters. With the help of plant trials suitable operating range for the selected parameters could be fixed, reducing the incidences of sub surface off corner crack generation. "

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