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| Analyse and Measures of Surface longitudinal cracks of Steel Sheet in CSP production |
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Abstract Surface longitudinal crack were studied and analized for SS400 steel sheet which occurred during CSP manufacture in this paper.The results demonstrated that most of the longitudinal cracks were distributed of 1/4 areas along the width direction of the steel sheet as parallel beam or reticulate form.The length and the depth of the cracks were 0.5-2mm and 0.1-0.2mm and the width was less than 1mm.Complex inclusions which composed of Na、Mg、Al、Si、Cl、K、Ca ets were found along the trench of the cracks, while only ferric oxide was found inside the cracks.Further analysis showed that such surface cracks originally formed in the successive mouldand further enlarged by the following secondary cooling and furnace heating. By controlling of the mould heat transfer and adjusting of secondary water cooling, longitudinal crack of steel sheet was controlled.
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Received: 25 September 2009
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2010, Vol. 29 
