简介：Inthisstudy,thespheroidizationprocessoflarge-deformedsteelundervariousconditionswasresearched.Steelwithahighcarboncontent(1.0%C)wasfirsttreatedthermomechanicallyusingmultipassrolling.Thenitunderwentspheroidizationtreatmentsatdifferentheatingtemperatures,usingvariousheatingtimesandcoolingrates.Spheroidizationprocesseswithalowerheatingtemperature,shorterheatingtime,orfastercoolingratethanthoseofthetraditionalprocessallshowedgoodresults,indicatingthatthespheroidizationprocesswaspromotedsignificantlybythelargedeformationprocess.Grainrefinementandfragmentationofcementite,alongwiththelargedeformationprocess,promotedthisspheroidizationprocess.

简介：High-strengthpipelinesteelandlargediameterlinepipesareoftenusedtoincreasethecapacityoftransportationandreducethecostassociatedwiththeconstructionandoperationoflong-distancegaspipelineprojects.China’sinitiativestoconstructlong-distancenaturalgaspipelineshasbroughtinnewopportunitiesforthedevelopmentofX80linepipes.BaosteelhasdesignedtheoptimumchemicalcompositionofX80withhighniobiumandlowmolybdenumcontent.Inaddition,aweldingexperimentalplatformandafiniteelementmodel(FEM)havesupportedthedevelopmentofX80UOEpipesinanefficientandeconomicalway.TheapplicationandrecentdevelopmentofX80UOEpipeswereintroducedinthispaper.TocomplywiththerequirementsoftheSecondWest-EastGasPipelineProject(2ndWEPP),X80pipelinesteelwithlowcarbonbainitemicrostructurewasdevelopedbyutilizingtheoptimizedcompositionandTMCPprocess.Thematchingweldingmaterial,weldingprocedureandUOEformingprocessesfor1219mmoutsidediameterX80UOEpipeswerealsodeveloped.Morethan340000tofX80UOEpipeswereproducedandappliedinthe2ndWEPP.Furthermore,tomeettheprospectivedemandforlong-distancegaspipelineswithanannualtransportationcapacityofover40billionm3,largersizeX80UOEpipeswith1422mmOD×30.8mmWTweretrialproducedrecently.DWTTperformance,themaintechnicalchallengeforheavierwallpipes,wasimprovedbyusingoptimizedmicrostructuraldesign.ThenewlydevelopedX80pipescanbepotentiallyusedforlargertransportationcapacitypipelinesinChina.

简介：Chinaisanimportantcountryinironandsteelindustry.Powerelectronicsconvertersarewidelyused.Forthecoldrollingmillsofhighspeed,AC-DC-ACconvertersshouldbeused.Inthepaper,thedesignandthecontrolsystemofthelargepowerthree-levelAC-DC-ACconverterwithIGCTsisinvestigated,andaback-to-backlargepowerthree-levelAC-DC-ACconverterwithIGCTshasbeengot.Withaseriesexperiments,theperformanceoftheconverterisexamined.Theexperimentresultindicatestheconverterreachesthedesignrequirementanditshowsexcellentperformance.Theconvertersystemhasbeenputintousesafely.ItisestimatedthattheAC-DC-ACconvertersystemwillbeusedinthedrivesystemsforrollingmillsinthenearfuture.

简介：BasedonthepracticeofBaosteel's60000m3/hairseparationunit(ASU),whichisthefirstdomestically-integratedunitofsuchascale,thispaperstudiestheprinciplesoftypeselectionofthedistributioncontrolsystem(DCS).Itdiscussesthedesignoftheunit'scontrolsystem,whichinvolvesacompressorsystem,apurificationsystem(molecularsieving),aturboexpansionsystemandanairseparationsystem.ThefinalpartofthepaperdiscussesthemaintenanceandfuturedevelopmentoftheASUcontrolsystematBaosteel.

简介：ThisstudymainlyintroducesthetechnicalpropertiesofakindofleancoalminedfromLu'an,aprefectureofShanxiProvinceanditsapplicationtocoalinjectioninlarge-scaleblastfurnaces(BFs)inBaosteel.Chinaisrichinleancoalresources.Thetechnicalpropertiesofleancoal,includingashcontent,sulfurcontentandcaloricity,etc.,aresimilartothoseofanthracitecoalusedinBaosteel,exceptthefactthatthevolatileofleancoalishigher.Besides,theexplosivepropertyandthecokingpropertyofleancoalaresuitablefortheBFcoalinjection.Inthisstudy,leancoalwastestedinthepulverizedcoalinjection(PCI)ofaBF.Inthetest,theblendingproportionofleancoalinthecoalblendwasincreasedgradually,andtheconsequentialproductionindexesweretraced.AlltheoperationalindexesshowthattheresultsoftheBFcoalinjectionaregood,demonstratingthatleancoalcanbesubstitutedforanthracitecoalinthePCIinBFs.Withanabundantamountandspecificutilization,leancoalisfoundtobeofahigheconomicvalue.

简介：Thefirstdomestically-integratedlarge-scaleairseparationunit(ASU)withacapacityof60000m3/hwassuccessfullybuiltandputintooperationatBaosteel.Comparedwiththeelectricaldesignoftheimportedequipmentofthesametype,thisASUhasanelectricalprotectioninterlinkthatisindependentfromthedistributioncontrolsystem(DCS).Withthedesignideaofsimplicity,theASUfeaturesasimplifiedconfigurationandanaudioalarmsystemforelectricalfailures.Ithelpsreducethefailurerateoftheelectricalequipmentanddetectfailuresquicklyandaccurately.Itwilleffectivelyenhancesafeandstabilizedproduction.TheASUcannotonlyreducethecostofinvestment,butalsoensureasmoothandstablerunningofthewholeelectricalequipment.Thisstudyfocusesontheexperienceandunderstandingoftheunitdesignandcommissioning.

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简介：BaoshanIron&SteelCo.,Ltd.,(referredtoasBaosteel)inChinafirstsucceededindevelopingtheU-ing-O-ing-Expanding(UOE)longitudinalsubmergedarcweldedpipes(SAWLs)offshorelinepipeofamaximumthickness/outsidediameter(T/D)0.042in2011.DescribedinthispaperistheresearchanddevelopmentoftheX70UOESAWLpipesbythecompany.TheresultshowsthatthesaidX70linepipehasbeenincompliancewithrelevantrequirementsasspecifiedinSpecificationsDNV-OS-F101,andhasbeensuccessfullyusedintheSouthChinaSeadeepwatergaspipelineproject.