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12212(1;2)X70HIC(hydrogeninducedcracking),HIC,HIC0,,,,,,,,,,HIC,,HIC,,,,,,,,HIC1,,HIC1.151016mm21.0mm,X7090#,,,NACEstandardTM0177-90,,pH2.7N2H2S99.9%,HIC1.2a),2LöminN2,N22h,,b)N2,2.4LöminH2S,1h,H2S0.12Lömin,96hc),d)2HIC,,7226120031©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.CTR(CrackThicknessRatio)CLR(CrackLengthRatio)11HICCTRö%2.03.05.26.05.6CLRö%1.52.02.32.72.42.1HICX70,2,HIC,2,,,,2F+P+BB+F+PB+F+PB+F+PF+B+P1110889,,HIC[1]HIC,HIC,:[2]:lgtf=ad-12+ba;bK1i(),;,,2:10,,,8,,HIC,HIC,,,,100%,AF,,,,,[3],:-,,,,HIC,,,Nb,Nb,w(Nb)0.08%,,,Nb[4]2.2HIC(3),,,,,,,,,,,,,,HIC,HIC8220031©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.3,,,,,HIC2.3HIC,:,,,[4],,,,;,,,B,F,Cu,Cu,,CuBP(pH=5.2),Cu,Cu,,pH4.5H2S,Cu,CuHICMo,,,,Nb(C,N),Mo,HIC[5],HIC,Nb;,,CMo3(1),HIC,,HIC;(2),,HIC;,HIC;(3),HIC1...:,2001,3192..:,1985,97983..:,2001,7114...:,2001,1811895..:,1995,9298,,1975,,:254:710055:02928276155(:2002207228),,2002161012,,,,20031,8.00,60.00(),92261:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.ABSTRACTSWELDEDPIPEANDTUBEVol.26No.1Jan.2003WTOand201ArticlestoTheInflunceandCounter-measureofChinaSeamlessPipeIndustryPengZaimei(1)Abstract:AfterChinajoinintheWTO,thesteelandironindustryfacesseriouschallenge.Itisanalyzedandpoint2edoutthatspecificarticlesofCustomsdutyreductionformainsteelproductsvarietydirectlyaffectChinasteelandironindustry,especiallyChinapipemanufacturingindus2try.Itisraiseditwillbringindirectimpacttochinaseam2lesspipeindustryaimingtoUSgovernmentofficiallystartedtocollect15%customsdutyrestrictiontoweldedpipeproductsamong201articlesonMarch20th,2002.Itisproposedanewconceptoftakingthedemandofmarketasthedevelopmentdirectionandtakingtheprin2cipleofexertingtheadvantageofnonreplaceableseam2lesspipequalityandavoidingtheadvantageofweldedpipeafterimpersonalanddetailresearchingandanalyzingthemarketsituation,sellingstatus,productioncapacityandtechnologydevelopmentdirectionofChinaseamlesspipeindustry.Keywords:WTOseamlesspipemarkettech2nologydevelopmentFatigueCrackGrowthRatesofTheParentandWeldedMetalsforAPIX52WeldedLinePipeShiYaowu,ShiXuan(7)Abstract:InthepresentworkfatiguecrackgrowthratesoftheparentandweldedmetalsfortwokindsofAPIX52weldedlinepipeshavebeenmeasured.Itisfoundthatthetwokindsofparentshavealmostthesamefatiguecrackgrowthrates,eventhereismorethan50MPadifferencebetweenstrengthofthetwoparents.Moreover,thefa2tiguecrackgrowthratesoftheweldmetalandheataf2fectedzonearelowerthanthoseoftheparentsforthetwolinepipes.Havingexcludedeffectofweldingresidualstressesoncrackclosure,fatiguecrackgrowthratesoftheweldedjointsareequivalenttotheparentsforthetwolinepipes.Keywords:pipelinesteelweldedlinepipefatiguecrackgrowthStatisticalDistributionofFractureToughnessforX65PipelineWeldMetalJinXiaojun,HuoLixingetal(11)Abstract:Affectedbytheprocessofwelding,thereisthestatisticvarianceinherentlyforthefracturetoughnessofweldmetal.ThefracturetoughnesstestofX65pipelineweldswasmade.Thestatisticaldistributionmodelwassetuptofitthedistributionfunctionoffracturetough2ness(C.Bytheseveralstatistictests,theresultsshowthattheoptimumfittingdistributionof(CisWeibulldis2tribution.Keywords:fracturetoughnessstatisticaldistributionweibulldistributionResearchonSensitivityofCenterlineIndentationandSo-lidificationCrackingofWeldSurfaceatStainlessSteelWeldedPipeHeDefuetal(15)Abstract:Theshapecharacteristics,occurrencereasonandeffectfactorsofcenterlineindentationandsolidifica2tioncrackingofGTAWandPAWweldsurfaceatstain2lesssteelweldedpipeusedforindustrialhavebeenana2lyzedinthispaper.Ithasbeensuggestedthatadequateselectingandcontrollingweldingparameters,especiallyweldingspeedisveryimportationinproductionoflargediameterstainlesssteelweldedpipeinordertopreventexcessivecenterlineindentationandsolidificationcrackingofweldsurface.Keywords:stainlesssteelweldedpipewelddefectcenterlineindentationcenterlinesolidifi2cationcrackingofweldoccurrencereasoneffectfactorsweldingparametersInsideWeldSeamandFlattenExperimentAnalysisofHighStrengthLowAlloyWeldedPipeYangChengshan(24)Abstract:Itismainlyintroducedproductionprocess,weldingsystemandparameterofrollinghighstrengthlowalloyweldedpipeandanalyzedtheexternalcauseofaffectinginsideweldseamandflattenexperimentop2erationtoinfluencethequalityofweldingandformingqualitytoinfluencethequalityofwelding.Andraisedpassdesignmethodwhichcombinedpassanddoublehalfdiameterpasstogether,controlledopeningdegreebe2tween4-7andweldingsqueezebetween4-5mm,andputthefrontofimpedanceonthecenterlineofsqueezerollandusedhighspeedwelding,inthiswayofproduc2tion,theinsideweldseamandflattenexperimentofhighstrengthlowalloyweldedpipecanmeettherequirement.Keywords:weldedpipelowalloyandhighstrengthsteelflattenexperimentinsideweldseamweldingsystemTestandResearchontheHICofHighStrengthInductionHeatingBendsYinChengxian,LiuWeietal(27)Abstract:Inthispaper,thedifferentabilitytoresistancetothehydrogeninducedcracking(HIC)ofinductionheatbendsisdiscussed.Weanalyzedthemainreasonthatin2fluencedtheresistancetotheHIC,advisedtheimprovingwaystoresistancetotheHIC