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BothresearchresultsandinduStrialoperationshaveshownthat,Whencastingsteelgradeswiththemassfractionofcarbonwearound0.I%,thetendencyofproducings~edefects,suchasdepressionandlongitUdinalcrack,isthehighest[I--3].Thesesurfacedefectsaregenerallyresultedinby...