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| Cause analysis and measures of unqualified detection for Angang plate |
| Sheng-Wei ZHANG MAO Jin-Hua |
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Abstract Sampling from the unqualified detection plate, through macro examination, metallographic analysis, cutting test and hydrogen content measurement, main causes for unqualified detection were attained: higher hydrogen content,MnS inclusion in steel, serious slab loosen segregation and faster cooling speed after rolling etc.Pre-desulphurization for hot metal, Ca treatment for MnS inclusion control in steel,vacuum degassing in VD furnace, caster roll and soft reduction parameter adjustment,slab and steel plate pilling up for slow cooling .etc. were adapted, the qualified detection rate of heavy plate increased by 12%.
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Received: 22 March 2010
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2010, Vol. 29 
