超超临界锅炉用钢TP92工艺试验研究

上海交通大学硕士学位论文超超临界锅炉用钢T/P92工艺试验研究姓名：刘秀春申请学位级别：硕士专业：焊接工艺指导教师：陆皓;叶上云20071101IT/P92T/P92T/P91610625T/P92T/P92T/P92T/P92T92R/D+T926256160MPa150MPa140MPa130MPa120MPa110MPaII105110MPaT92625SA213-T92750-7802h625T92R1.5DT92R/D2+R/D2T92P92300SA335-P92770610hT/P92AbstractIProcessTestStudyofUltra-supercriticalBoilerSteelT/P92AbstractT/P92onthebasisofT/P91isfurtherstudiedanddeveloped,higherstrengthgradeferritesteel.Thissteelhasgoodhightemperatureoxidationresistanceandcorrosionresistance.Itcanmakethemainsteamparameterstoreach610andreheatsteamtemperatureincreasedto625.ThispapermakesfurtherresearchofT/P92processtestintheUltra-supercriticalboil.AccordinglywehaveamorecomprehensiveunderstandingofT/P92steelandputforwardoptimizationofprocessparameters.Itprovidedtechnicalsupportintheaspectofinstructinganappropriateweldingprocess,heattreatmentprocessandmachiningprocessduringthemanufacturingintheShanghaiBoilerWorksLtd,moreover,ithasanimportantsignificanceinenhancingthecapacityofthermalpowergeneratingunits,improvingpowergenerationefficiency,reducingthecostofpowergeneration,bettersolvingpowershortageforourcountryandpromotingdevelopmentofChina'snationaleconomy.ThispapermainlystudiesT/P92steelanditsweldedjoints.T/P92Overallpropertiescanbeevaluatedthroughdifferentweldingmethods,differentinterpasstemperatureanddifferentpost-weldingheattreatment,finallydeterminedtheoptimumprocessparametersandpost-weldheattreatmentspecificationunderdifferentweldingmethods.WemakeT92IItubes’cold-formed,neckingandhaveasquashtestµstructureandgrainsizemeasure&specimenhardnessinordertodeterminewhatistheconditionsofnormalizingplustemperingforthedifferentratioR/DAndthatdetermineoptimumheattreatmentspecification.Wehaveshort-termandlastinghightemperaturetestsforT92steelweldjointsUnder625andextrapolatestressvalueunder105hoursaccordingtorunningtimeundersixstresspoint(160MPa,150MPa,140MPa,130MPa,120MPa,110MPa).Atlastthebrokensampleof110MPaismademicroanalysisinordertodeterminewhetherornotT92tubes’lastingstrengthcanmeettheapplicationrequirementsunder625.Theresultsshowthat:SA213-T92Post-weldheattreatmentspecificationisdetermined750-7802hnomatterwhatthesamesteelbuttweldingordifferentsteelbuttwelding.BesideslastingstrengthofT92tubes’buttjointscanmeettheapplicationrequirementsunder625.T92tubes’ovalityandreductionwillbeguaranteedwhentubecoldbendingradiusR1.5D.AfterT92tubes’coldbending,normalizingplustemperingshouldbepreformedwhentheratioR/Dislessthan2andannealingwithweldedattachmentswhentheratioR/Disnotlessthan2.ThereislittleextensionforT92steel,sothematerialisnotrequirednecking.ForP92weldjoints,theinterpasstemperatureshouldbestrictlycontrolledunder300inordertogetbetterweldproperties.Inaddition,theweldjointshouldbeimmediatelyde-hydrogenationafterweldinginIIIordertopreventfromreducingcoldcrack.TheP92optimumtemperatureofpost–weldheattreatmentis770andholdingtimeselectedfrom6to10hours.Keywords:T/P92steel,weldingprocess,machiningprocessing,post-weldheattreatment,hightemperaturetest20071110200711102007111011.122.1Mpa40022.1Mpa400[1]1.7%538~566600~6103.5%[2]50MW2002125MW600MW900MW1221.2[3]123453Cr-MoCr-MoCr-MoT2259012Cr1MoVG580[4]580TP304HTP347HSuper304HHR3C600700HR3CTP347H[5][6][7]20709Cr1MoVNb9CrlMoVNb(P91/T91)[8]P91/T91P91585[9],1.3T/P9241.3.1T/P9260EM12X20CrMoV12-1EM129%Cr-2%MoVNb[10]V12%Cr-1%MoX20CrMoV12-19%CrT/P91[11]909-12%Cr62565030MPa610625[12]60025MPaT91/P91T/P92[13]T/P92T/P91T/P91WBWB[14]BN9%1.75%0.5%[15]9%[16]1-11-1[17]Table1-1thedifferentsteeltubeapplicationinEuropean,AmericanandJapan60T/P22STBA24-STPA24560T/P347HSUS347H60T/P22STBA24-STPA2480T/P91STBA28-STPA2890T23T/P122HCM2SHCM12A1998T/P92STBA29-STPA291.3.2T/P92(1)19951996ASTMASMET/P92T/P92ASMECodecase2179SA213-T92SA335-P92[18]1-21-2Codecase2179T/P92Table1-2TheT/P92maximumavailablestressadvancedaccordingtoNo.2179code371399427454482510538566593621649MPa154151147143138132126119947048(2)ASTMT/P921-3T/P92T/P921-3T/P22,T/P91,TP347HT/P92%Table1-3thechemicalanalysisofT/P22,T/P91,TP347HT/P92CMnSiCrWMoVNbNBAlNiT/P220.150.30-0.600.0250.0250.501.90-2.60/0.87-1.13//////T/P910.08-0.120.30-0.600.0200.0100.20-0.508.00-9.50/0.85-1.050.18-0.250.06-0.100.03-0.07/0.040.46CMnSiCrWMoVNbNBAlNiTP347H0.04-0.102.000.0400.0300.7517.00-20.0//////9.00-13.00T/P920.07-0.130.30-0.600.0200.0100.508.50-9.501.50-2.000.30-0.600.15-0.250.04-0.090.03-0.070.001-0.0060.040.48CNb+Ta1.00(%)(3)T/P92T/P92Ac1800835Ac3900920T/P92+1040~1080750~780T/P92450HVT/P92Ms400Mf100[19,20]1-4ASTMV&M1-4T/P92Table1-4theT/P92normalizingandtemperingASTMA213/A335V&M10401040~1080730750~780(4)T/P921-51-5Table1-5themechanicalpropertiesofseveralsteelsMPaMPa%A213-A335P22205415301637T22220A213-A335T/P9144058520250A213-A335T/P9244062020250A213-A312TP347H205515351921.3.3T/P92[21]T/P92,T92580~600600~620[22]P926251.4T/P92T/P921.4.11T92TIGMIGTIG2T92T92+83SA335-P92GTAW/SMAW/SAW4T92TIG42.26.66256160MPa150MPa140MPa130MPa120MPa110MPa—105,110MPa1.4.2T/P92T/P92T/P92T/P92T/P92T929T92300MW600MW900MW15CrMoG12Cr1MoVG12Cr2MoWVTiBSA213-T22SA213-T91SA213-TP304HSA213-TP347HSA213-T92,[23]2-1Fig.2-