简介:Drillpipeproductsarethemostcriticalservicerequirement,thehighestperformancerequirementandthehighestqualityreliabilityOCTGproducts.Throughthecontinuousresearchonsteelmaking,upset,hearttreatment,straighteningandfrictionwelding,Baosteelimprovesthekeytechnicalparameterswhichaffectthequalityofdrillpipe,suchasmaterialpurity,Miuofinternalupsettransitionarea,toughnessandstraightness.Baosteeldrillpipeproductshavemetthedemandingrequirementofdrillingoperations.ByBRPdephosphorizationandLFdesulfurization,theP,ScontentofBaosteeldrillpipeisverylow.TheScontentofS-135drillpipecanbecontrolledinlessthan10ppm.Baosteeldesignsanewclosed-loopcontrolsystemofupsetendinductionheatingsystem.Thesystemusetemperaturemeasurementinsidetheovenandclosed-loopcontrol.Thetemperatureaccuracyofthesystemcanbeguaranteedwithinthe±15℃togetastableupsetquality.TheupsettingprocessofthedrillpipeisoptimizedbyusingpatentedtechnologyandmadetheMiufrom100mmto140mm.Thismakeasubstantialincreaseinfatiguelifeofthedrillpipe.Toimprovetheimpacttoughnessofthedrillpipebody,thedrillpipebodymaterialischangedfromCr-Ni-MosystemtoCr-Mo-Vsystemandtheheattreatmentischangedfromoilquenchingtowaterquenching.Toimprovetheimpacttoughnessofthetooljoint,thetooljointfurnaceisupgradedtoimproveheatingcapacity.Toimprovetheimpacttoughnessoftheweldzone,anewfuzzycontrolsystemofweldzoneheattreatmentisdeveloped.Thetemperatureaccuracyofthesystemcanbeguaranteedwithinthe±5℃togetastableheattreatmentquality.Anewdrillpipestraightnessautomaticdetectiondevicesandself-learningmethodofstraighteningaredevelopedtoachieveautomatedstraightening.Aweldingprocesswithhighspeed,single-stagepressureandhighforgingforceisappliedtoinertiafrictionwelding.Aweldingprocesswithlowspeed,three-stagepressureandlowforgingforceisappli
简介:Thispaperanalyzesthecurrentdifficultiesencounteredinon-lineinspectionsystemsofstripsurfacequality,specificallyrelatingtoproblemswithreal-timeprocessingofhugeamountsofdata.Toaddressthisneed,thispaperdescribesanFPGA-basedhigh-speedimageprocessingmodulewithbothhardwareandsoftwareaspects.Improvingthesetwoaspectstogetherwillhelpthesystemachievereal-timeprocessingofmassiveimagedata,andsimplifiesthearchitectureofthestripsurfacequalityon-lineinspectionsystem.
简介:Thisstudyaimstosystematicallyanalyzethekeyparametersofthereflowprocessthatinfluencetheuniformityofthechromiumpassivationfilmcoatedontinplate.ThedistributioncharacteristicsofthechromiumpassivationfilmcoatedonthetinplatesurfaceunderdifferenttreatmentconditionsweresystematicallycharacterizedusingthescanningKelvinprobetechnique,X-rayphotoelectronspectroscopy,andX-raydiffraction.Resultsindicatethattheuseoffluxreducestheporosityoftincoating,therebyfavoringtheuniformgrowthofthepassivationfilm.Furthermore,anincreaseinthereflowpowerandquenchingtemperaturefacilitatesthehomogeneousdistributionofthepassivationfilmonthetinplatesurface,particularlywhentreatedwithelectrolyticcathodicsodiumdichromate.
简介:BasedontheanalysisresultsofthedustsizedistributionoffluegasfromBaosteel'sshort-flow(BSSF)slagprocessingsystemandthemechanismofthewetscrubber,awetscrubbersystemwasdesignedandinstalledintheNo.1BSSFslagprocessingsystematBaosteel.Theresultsshowthatthedustremovalefficiencyoftheprevioussystemthathadconventionalwaternozzleswasonly69%withaliquid-gasratioof0.79L/m3,whilethedustremovalefficiencyreached94%whenthreesetsofhigh-efficiencydualphasespraygunswereinstalledinsideboththeflueandthechimney.Forthelattersystem,theliquid-gasratiowas0.84L/m3,andthedustconcentrationinthecleanedemissionsreducedtolessthan40mg/m3.
简介:Influenceofthermo-mechanicalcontrolledprocessing(TMCP),includingtwo-stagerollingwithlaminarcooling,aircoolingandultra-fastcooling,onthemicrostructureandmechanicalpropertiesofthreekindsofNb-microalloeyedsteelswasinvestigatedbyhot-rollingexperiment.Effectofchemistrycompositionsandmicrostructureonmechanicalpropertiesandtherelationshipbetweenthemultiphasemicrostructure’sformationwithTMCPwereanalyzed.Theresultsshowedthatthemixedmicrostructurecontainingferrite,bainite,martensiteandasmallamountofretainedaustenitecanbeobtainedbythermo-mechanicalcontrolledprocessing.Size,quantityanddistributionoftheconstituents(ferritegrain,bainitepacketandM-Aislands)significantlyaffectthemechanicalpropertiesofthreekindsofNb-microalloyedsteels.UndertheconditionofsimilarTMCPparameters,thereisagraduallydecreasingtendencyintensilestrengthfromhighsiliconNbsteel,highsiliconNb-TisteeltolowsiliconNb-Tisteel,andanoppositetendencyintotalelongationandproductoftensilestrengthandductility.Totalelongationandproductoftensilestrengthandductilityreachthemaximumvalues(41%and25256MPa%respectively)forlowsiliconNb-Tisteel.
简介:Thisstudyprovidesanoverviewoftheproductionandclassificationofmetallurgicalslaganditsimpactonenergy-savingandemissionreductioninthemetallurgicalindustryandananalysisoftheimpactofkeyfactorsonslagprocessingtechnology,includingabriefaccountofblastfurnace(BF)slagprocessingandapplicationswithafocusonthesteelslagdisposalprocessesandthefeaturesofsometypicalprocesses.Inviewofthecharacteristicsofthebasicoxygenfurnace(BOF)slagandthetechnicaldifficultiesfacedbythetraditionalprocesses,itdescribestheprinciple,featuresandtechnicaladvantagesoftheBaosteelshort-flow(BSSF)steelslagtreatmentprocessdevelopedbyBaosteel.Thethinkingandoutlookonthedirectionofthedevelopmentofthemetallurgicalslagprocessingprocessarestated.
简介:Steelproductionremainsanenergy-intensiveindustryinaworldwherethereisanever-increasingemphasisonloweringenergycosts,reducinggreenhousegasemissions,ensuringenvironmentalcompliance,andimprovingproductionrates.Asthegrowthindemandforspecialitysteelscontinuesitssteadyincrease,andnewmarketopportunitiesforeverhighersteelperformanceappear,significantglobalattentionisfocusedonsecondarysteelprocessing,andontheVD,VODandRHprocesses.Onenewtechnologyisabletoaddressalloftheseissuesandconcernstogether-theintegratedladletankvacuumdegassingstationequippedwiththenewmodularmechanicalvacuumpumpingsystems.Thispaperwillexaminetheeconomicandenvironmentalbenefits,operationalcharacteristics,andrecentresultsprovidedbysuchsteeldegassinginstallations.
简介:Cold-rolledhighstrengthsteelsheetsforautomobilescontainmoreMnandSibasedalloyelements,which,underthereducingatmosphereintheannealingfurnace,willgetenrichedonthestripsurface.Sincethefurnacerollersandthestripscontactfrequently,alloyelementsontherollersurfacewillformhardprotuberance.Wecallthisprotuberance"pick-up".Inaddition,withtheincreaseoftheamountofdustinthefurnaceatmosphere,theoccurrenceoffurnacerollerpick-upwillalsoincrease.Throughchemicalreactionandphysicalaccumulationanalysiscombinedwithpracticalexperience,thecausesofpick-upindifferentfurnacesectionswereanalyzed.Methodsofpreventingfurnacerollerpick-upinthehighstrengthsteelsheetprocessinglinewerediscussedandsolutionstoimprovingthestripsurfacequalityinthecontinousannealingfurnacewereprovided.