简介：Pre-paintedsteelisoneofthemostimportantstructuralmaterialofthe20thcenturywellknownforitsexcellentcorrosionresistanceandwiderangingapplications.Atypicalpre-paintedsteelusuallyconsistsofalayerofmetalcoatingsystem,preferablyzincorzincalloycoatingandacombinationoflayersofinorganic-organiccoatingsusuallyreferredtoaspaintsystem.Thecorrosionresistanceofthemetalcoatingaswellasthepaintsystemmayvaryconsiderablybasedontheircompositionandtheenvironment.Foroptimalcorrosionperformanceofpre-paintedsteel,ajudiciousselectionofbothmetalandinorganic-organiccoatingsystemsareessential.Thispaperreviewsdifferenttypesofpossiblecorrosionissuesinpre-paintedsteelsandmethodstooptimisetheirperformance.

简介：Furnaceareaisregardedaslooperbetweencastingandhotrolling,whichisveryimportantformaterialflowbalanceandproductionorganizationaswellastemperatureregulationetc.Inparticular,whendealingwithenergysavingandemissionreductionandheatingqualityimproving,pre_heatingfurnaceispaidmoreattention.Theradicaltargetforpreheatingfurnaceistotransferheatingenergyattheleastcost.Asweknow,thepreheatingfurnaceisadissipationsystemtoobeyconservationofenergylaw,thatistosaythatinputenergyalwaysequalstooutputenergy,inthemeantime,thewholeenergyconsumingisnotreversible.Thereforeincreasingtheefficiencyofusingenergyisuppermost.Inthispaper,heatingtransferefficiencyisanalysedandmathematicalexpressionisgivenbasedonconservationofenergylaw.Typicaloptimalmethodstoimprovepreheatingfurnacetransferefficiencycomingfromforeignfactoriesarepresented.Accordingtothesemethods,everyfurnacezonetemperaturesascontrolvariable,targetdischargingtemperatureandtemperaturedifferenceinslabthicknessandthetemperaturebetweenneighbouringzonesaswellaszonetemporarytemperatureasrestrictions,minimalenergyconsumingasoptimizingtarget.Baosteelpreheatingfurnacemodelstructureandthecomplicatedmappingrelationofcontrolparametersetandstatesetandaimsetarepresented.Importantbasicmodelsinthepreheatingfurnacemodelsystemareanalysedincludingtemperaturetrackingmodelandtemperatureforecastingmodelanddischargingpacingmodelandslabheatingcurve.Firstslabtemperaturemodelstructureanditsperiphericparameterareintroduced;secondtwopacingmodelsaregivenincludingtimingpacingmodeusingfixeddischargingintervalandmillpacingcontrolmodeusingmillrollingpacingwhileBaosteelpacingforecastingmodelusinglongtermandshorttermforecastingmode)isgiven;thirdaheatingcurvemathematicalmodelconsideringheatingqualityandrollingpaceandenergyconsumingispresented;

简介：Atypeofself-cleaningpre-coatedsteelsheetwithexcellentself-cleaningperformancewasdevelopedusinghydrophilicsurfacetreatmenttechnology.Tounderstandtheself-cleaningpropertiesofthispre-coatedsteelsheetinanindustrialenvironment,theJiangjinnaturalenvironmentalteststationwaschosenastheoutdoorexposuretesttobeconducted,andtheself-cleaningperformanceofthesteelsheetwasstudiedbymeasuringthewatercontactangle,stainresistancefactor,colordifference,andglossofthesteelsheetduringtheoutdoorexposuretest.Thewatercontactangleoftheself-cleaningsteelsheetquicklydecreasedfrom84°to29°duringtheoutdoorexposuretest,andthesteelsheetshowedexcellenthydrophilicproperties,whichwerebeneficialtothespreadofraindropsanddetrimentaltotheaccumulationofthesurfacepollutants.Afteranoutdoorexposureof12months,theself-cleaningsteelsheethadahigherstainresistanceandcleanersurfacethanthecomparisonsamplesheet,demonstratingitsexcellentself-cleaningproperties.Moreover,thecolordifferenceandglossrateoftheself-cleaningsteelsheetweresimilartothoseofthepre-coatedsteelsheetwithouthydrophilicsurfacetreatment.Therefore,thehydrophilicsurfacetreatmenttechnologyusedinthisstudydidnotaffecttheanti-agingpropertyoftheself-cleaningsteelsheet.