Control for Surface Faint-Sliver Defects in Cold-Rolled IF Steel Sheet

Yong Chen; Jian Hua Zeng; Guo Rong Wu

doi:10.4028/www.scientific.net/AMR.396-398.1145

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 396-398Control for Surface Faint-Sliver Defects in...

Control for Surface Faint-Sliver Defects in Cold-Rolled IF Steel Sheet

Abstract:

The samples of cold-rolled sheets, hot-rolled plates and continuously cast slabs have been analyzed with the condition of faint-sliver defects appeared in IF steel of Pangang, and it was shown that faint-sliver defects in cold-rolled steel sheet were mainly caused by micro-cracks in the surface of strands, slag entrapment in mold during casting and inclusions in sub-surface of strand. Faint-sliver defects were controlled effectively with the technical measures, which were decreasing oxidation of ladle slag, controlling the ratio of CaO/Al2O3 in slag, extending circulation time of deoxidization and alloying in RH process, controlling the casting speed and increasing the viscosity of mold fluxes. Therefore, the ratio of downgrade induced by faint-sliver defects reduced from 10.97% to 1.0%.

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Periodical:

Advanced Materials Research (Volumes 396-398)

Pages:

1145-1150

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.396-398.1145

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Online since:

November 2011

Authors:

Yong Chen, Jian Hua Zeng, Guo Rong Wu

Keywords:

Faint-Sliver Defect, Forming Reason, IF Steel, Mold Fluxes, Refining Process

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