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1、DevelopmentApplicationofSubmarinePipelineSteelZHENGLeiGAOShanLUMin(BaoshanIronLSAWlinepipehighstrengthhightoughnesspipelinesteel.1IntroductionThedevelopmentofremotefieldsmarginalfieldsoffshefieldsarespurredonbythedemfene

2、rgygrowthincreasingly.Submarinepipelineisusedtotransptnaturegasfromoffsheplatfmtolthroughlongdistancesotheimptanceofsubmarinepipelineisgettingobvious.Astheoffsheenvironmenttheconditionofconstructionontheseaisharsherthant

3、hatonshetherequirementofconstructionoperationofsubmarinepipelineismuchstricterthanthatofonshepipeline.thecostcontrolofoffshepipelineprojectisalsoimptant.Therefethesubmarinelinepipeshouldmeettherequirementofhighstrengthhi

4、ghtoughnessgoodweldability.notonlythestrengthofthelinepipeshouldmeettherequirementofsubmarinepipelinestardbustalsothelongitudinalstrengthofthelinepipeshouldmeettherequirementofcrespondingstard[1].Recentyearsmethan20000km

5、submarinepipelinewerelaidontheseabedwiththedevelopmentofoffsheoilgasindustryinChina.Thesteelusedtomanufacturethelinepipewasimpted.Methan2000kmsubmarinepipelinewillbeconstructedinthefollowingfiveyears.Whetherthepipelinest

6、eelfsubmarinepipelineprojectcanbeproduceddomesticallyisachallengetotheChinesesteelindustry.PipelinesteelhasbeendevelopedproducedinBaosteelfmethanfifteenyearsespeciallytheX70withacicularferritepipelinesteelhasdevelopedapp

7、liedontheWesteastGasPipelineProjectinChina[23].TheexperienceofproducingonshepipelinesteelintrialproducedatBaosteel.ThecompositionsofthesteelarelistedinTable1.Thecarboncontentofthetrialsteelisjust0.040%.Thesulphurcontentp

8、hosphuscontentareenoughlowwith9ppm60ppmrespectivelythecalciumtreatmentisused.Alsoitcanbeseenthatniobiumtitaniummicroalloyedmolybdenumlowalloyedareused.TheCeqPcmofthesteelareverylowwhichisonly0.32%0.13%respectively.Thegoo

9、dweldabilityofthesteelcanbeobtained.Table1ThecompositionsofthetrialX65steelfsubmarinepipeline(wt%)CSiMnPSNAlCaOtherCeqPcm0.0400.211.460.0060.00090.00320.0240.0022MoNbTi0.320.13Ceq=CMn6(CrMoV)5(CuNi)15Pcm=CSi30Mn20Cu20Ni6

10、0Cr20Mo15V105B3.2ThepropertiesofthetrialX65steelstripfsubmarinepipelihe14.3mmT.?1550mmW.15.9mmT.?1550mmW.X65stripfsubmarinelinepipeweretrialproducedbyTMCPinhotcontinuousrollingmill.Thelongitudinaltransversesamplesfmechan

11、icalpropertiesweretakenfromthetrialproducedstrip.ThentensiletestpyimpacttestCTODtestDWTTtestwereperfmedtheHv10hardnesswasmeasured.SometestresultsarelistedinTable2.Theyieldstrengththetensilestrengthofthetrialsteelinbothtw

12、odirectionsismethan490MPa580MParespectively.ConsideringoftransverseyieldstrengthoflinepipemaybedecreasingasBauschingereffectduringthepipemakingflattingpipesamplethestrengthofthecoilssatisfiesthattransversestrengthoflinep

13、ipewhichmadefromthecoiltomeetthestrengthrequirementofX65linepipe.Thetrialsteelhashighelongationsuitableyieldratiotheyieldratioislessthan0.90.Thelongitudinalstrengthyieldratioofthestripsislowerthantransversestrengthyieldr

14、atio.Itshowsthestrengthanisotropyacterofmicroalloyedsteelbycontrolrolling.Thelongitudinaltransversepyimpactenergyfractureshearareaaremethan355J100%at60℃respectively.ThelongitudinaltransversefractureshearareaofDWTTtestare

15、all100%at30℃.TheCTODvalueismethan0.337mmat0℃.Theseshowthetrialsteelhasverygoodfracturetoughnessatlowtemperaturethedifferenceoftoughnessbetweenlongitudinaltransversedirectionofthesteelisverysmall.Itisbenefitfromultralowca

16、rboncontentdesignthecleansteeltechnologyofverylowphosphusultralowsulphurcalciumtreatment.TheHv10hardnessofthesteelislessthan200whichmeansthesteelhasgoodweldability.Table2ThepropertiesoftheX65trialsteelfsubmarinepipelihic

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