Minimization of Cracks on the Narrow Face of Cast Slab for HCMA Grade Steel

• Published in: Transactions of the Indian Institute of Metals Vol. 77; no. 11; pp. 4033 - 4039
• Main Authors: Kumar, Shubham, Rai, R. K.
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 01-11-2024; Springer Nature B.V
• Subjects: Casting defects; Chemistry and Materials Science; Corrosion and Coatings; Cracks; High carbon steels; High strength low alloy steels; Materials Science; Metallic Materials; Microstructural analysis; Molds; Original Article; Slab casting; Strip; Strip casting; Tribology; Continuous casting; Optical microscopy; SEM; Casting defects
• ISSN: 0972-2815; 0975-1645
• DOI: 10.1007/s12666-024-03454-1

Transverse corner cracks are among the most common defects in high carbon and high carbon micro-alloyed grade slab casting. Calculation and analysis were done to minimize the negative strip time of mold oscillation, which is responsible for reducing the depth of the oscillation mark formed on the slab surface. The value of negative strip time decreases with an increase in the frequency of mold oscillation. Based on the trial results, it was suggested that the oscillation proportionality be adjusted from 1.2 to either 1.25 or 1.3. This adjustment will reduce the depth of oscillation marks and the tendency to form transverse cracks. The transverse crack on the narrow face of the slab was examined for crack analysis and compositional analysis. Microstructural analysis revealed that the crack has no branching and consists of an iron scale inside it. Furthermore, it is observed that the crack propagates across the allotriomorphic ferrite grains.