简介：Sprayingtestwereconductedtwicebeforesteelslabswereputintothefurnaceandtheeffectsoftheoxidationresistancecoatingwereinvestigatedandverified.Bycomparingthechangeofslabweight,rollingforceoftheroughingmill&finishingmill,thicknessofoxidefilmonthesurfaceslabsbyanXL-30SEMandacidpicklingspeedofslabswithandwithoutcoating,itwasfoundthattheoxidizationwasteinthefurnacedecreasedby40percentwiththeuseofthecoatingandthecorrespondingyieldcapacitycouldincreaseby0.2percentatleast.Besides,thethicknessofoxidescalefilmonhotrolledproductswasreducedby1.44micrometersandtheacidpicklingtimewasshortenedby6swiththecoatingtechnology,whilethetotalrollingforceofRM&FMdidnotchanged.Furthermore,theapplicationprospectofthistechnologywasalsodiscussedinthispaper.

简介：Anexperimentalapparatusandanumericalsimulationmodelwerebuiltforinvestigatingthedentresistanceoflightweightthree-piececans.Thedentresistanceofrawmaterials0.19mmT4and0.17mmDR7Mwascompared.Itwasfoundthatwhenthethicknessreducedfrom0.19to0.17mm,thedentresistancebecameabout80%ofthatbeforethinning.Thisprovidesaguidanceforthecontinuousthinningofthree-piececans.

简介：TheeffectofrareearthelementyttriumonthehightemperatureoxidationresistanceofadirectionallysolidifiedNi-basesuperalloywasstudiedwithscanningelectronmicroscopy(SEM),energydispersivespectrum(EDS)andX-raydiffraction(XRD)techniques.Theresultsshowthattheoxidationresistanceofthealloyissubstantiallyimprovedbyaddingproperamountofyttrium.

简介：ZhongyuanoilfieldsaremainlylocatedinDongpudepression,wherethegeologicalconditionswereextremelycomplicatedandtheexternalstressisabnormallyhigh,thepipeusedmayfailintheradialdirectionowingtowellshrinkagecausedbythecreepofsaltrock,leadingcatastrophiceconomicloss.Thereforethisregionhasbeenwellkownasatouchstoneforhighcollapseresistancecasingsincelongbefore.Inordertosatisfytherequirementforhigh-collapsestrengthcasingowingtothecreepofsaltbedstratuminDongpuDepressionregion,BG140TT,BG150TTandBG160TThigh-strengthcollapseresistancecasingseriesweredevelopedtobettercopewiththeseveregeologicalconditions.Amongthecasingseries,aBG160TTnon-APIspecificationcasingwithcollapsestrengthnotlessthan170MPawereprepared.Uptopresent,allthesehigh-strengthcollapseresistancecasinghavebeensuccessfullyappliedintheDongpuDepressionregion.Theresearchconcept,mechanicalproperties,aswellasapplicationresultwereintroducedinthispaper.

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简介：Theeffectsofsamarium(Sm)oncarbon-methanationandcatalyticactivityoftheBa-Ru-K/AC(activecarbon)catalystforammoniasynthesiswereinvestigated.Theadditionofsamariumimprovedsignificantlytheactivityandstabilityofthecatalyst.Theresultsoftemperature-programmeddesorption(H2-TPD)andin-situ-TPSRFTIRindicatedthatsamariumimpededtheadsorptionofhydrogenonthecatalystsurface,thusleadingtothehighcatalyticactivityandresistancetocarbon-methanation.XRDpatternsreve...

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简介：Thedull-finishferriticstainlesssteel(FSS)sheetB445RforarchitecturalroofinghasbeendevelopedbyBaosteel.ThissteelproductexhibitsexcellentcorrosionresistancesuperiortothatofSUS316Lwithalowercost.Itcanbeeasilyformedintoroofingpanelsbyordinaryprocesses.Moreover,thethermalstrainofitislessthanSUS316Lbecauseofitslowerthermalexpansioncoefficient,anditsreflectivityislowerduetothedull-finishtreatment.Allofthesefeaturesmakeitcapableofbeingusedasarchitecturalroofingmaterialsincoastalregions.

简介：Withpricesformetalresourcessuchasnickelandmolybdenumsoaring,thereisaheightenedsenseofcrisisconcerningresourcescarcity.WhileType304,themostcommonstainlesssteel,offersexcellentcorrosionresistance,itspriceisaffectedsignificantlybythecostofnickelbecauseofits8%nickelcontent.ThestainlesssteelthathasthesamecorrosionresistanceasthatofType304anddoesnotcontainnickelandmolybdenumhasbeenrequired.JFESteelCorporationhasdevelopedanew21%Cr-0.4%Custainlesssteel,theworld’sfirstferriticstainlesssteel,whichoffersequivalentcorrosionresistancetoType304whilecontainingabsolutelynonickelormolybdenum,tworaremetals.Thenewlydevelopedsteelcontains21%chromiumwiththeadditionof0.4%copper.Thedevelopmentofthesteelisbasedonanewdiscoverythatthepassivefilmsofstainlesssteelscouldbestrengthenedbythesynergyeffectofhighchromiumcontentandcopperaddition.Copperadditionenrichesthechromiumcontentinpassivefilmsafterfieldexposure.Newlydeveloped21%Cr-0.4%CustainlesssteelisadoptedformanyapplicationsasasubstitutionforType304,includingcommercialkitchenware,buildingmaterialsandindustrialmachinery.ThesteelisexpectedtobeanewstandardofaferriticstainlesssteelasasubstitutionforType304.

简介：TheinfluenceofrareearthoxideCeO2onmicrostructureandwearresistanceofM80S20thermalsprayandthermalsprayweldingcoatingsisstudiedusingopticalmicroscope,scanningelectronmicroscope,X-rayenergydispersionspectroscope,X-raydiffractometerandweartestingmachine.Theresultsshowthattheaddi-tionof8%CeO2canimprovethemicrostructure,microhardnessandwearresistanceofcoatingssignificantly.

简介：Advancedhighstrengthsteel(AHSS)hasbeenwidelyusedintheautomobileindustry.TheresistancespotweldingperformanceofDP980andQ&P980steelswasstudiedthroughcomparingthetwosteels'weldingcurrentrange,tensileshearstrength(TSS),crosstensionstrength(CTS),weldspots'microhardness,etc.Thefollowingconclusionswereachieved:ItiseasyforbothDP980andQ&P980steelstogetanuggetsizebiggerthan4mm,theyallhaveweldingcurrentrangesexceeding2kAandhighweldstrength.

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