Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Formation Mechanism and Prevention Method of Facial Cracks of Continuously Cast Steel Slabs Containing Boron
Koichi YAMAMOTOHirowo G. SUZUKIYasuhide OONONaotaka NODATooru INOUE
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1987 Volume 73 Issue 1 Pages 115-122

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Abstract

Transverse facial cracks occurring in boron-containing CC slabs were fractographically analysed and the cause was found to be austenite grain boundary fracture due to the precipitation of BN along it. The embrittlement due to BN precipitation was very well simulated by the hot tensile test with Gleeble Tester.
In order to avoid the facial cracks, two methods were proposed. One is the reduction of nitrogen content to satisfy the condition; (wt% Nt-0.2×wt%Ti)<0.003 wt%, and the other is the keeping of cooling rate less than 0.5°C/s in the secondary cooling zone to promote matrix precipitation of coarse BN.

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© The Iron and Steel Institute of Japan
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