双相不锈钢的详细介绍(practical guidelines for the fabrication of duplex stainless steels)

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1、双相不锈钢的详细介绍(PracticalGuidelinesfortheFabricationofDuplexStainlessSteels)导读：就爱阅读网友为您分享以下“双相不锈钢的详细介绍(PracticalGuidelinesfortheFabricationofDuplexStainlessSteels)”的资讯，希望对您有所帮助，感谢您对92to.com的支持!2HistoryofDuplexStainlessSteelsDuplexstainlesssteels,meaningthosewithamixedmicrostructureof

2、aboutequalproportionsofausteniteandferrite,haveexistedfornearly80years.Theearlygradeswerealloysofchromium,nickel,andmolybdenum.ThefirstwroughtduplexstainlesssteelswereproducedinSwedenin1930andwereusedinthe125sulfitepaperindustry.Thesegradesweredevel-opedtoreducetheintergranularc

3、orrosionproblemsintheearly,high-carbonausteniticstainlesssteels.DuplexcastingswereproducedinFinlandin1930,andapatentwasgrantedinFrancein1936fortheforerunnerofwhatwouldeventuallybeknownasUranus50.AISIType329becamewellestablishedafterWorldWarIIandwasusedextensivelyforheatexchanger

4、tubingfornitricacidservice.Oneofthefirstduplexgradesdevelopedspecificallyforimprovedresistancetochloridestresscorrosioncracking(SCC)was3RE60.Insubsequentyears,bothwroughtandcastduplexgradeshavebeenusedforavarietyofprocessindustryapplicationsincluding2205continuoussulphatepulpdig

5、esterandimpregnationtower,SodraCellM?nsteras,Sweden(Source:KvaernerPulping)vessels,heatexchangersandpumps.Thesefirst-generationduplexstainlesssteelsprovidedgoodperformancecharacteristicsbuthadlimitationsintheas-weldedcondition.Theheat-affectedzone(HAZ)ofweldshadlowtoughnessbecau

6、seofexces-siveferriteandsignificantlylowercorrosionresist-ancethanthatofthebase125metal.Theselimitationsconfinedtheuseofthefirst-generationduplexstain-lesssteels,usuallyintheunweldedcondition,toafewspecificapplications.In1968theinventionofthestainlesssteelrefiningprocess,argonox

7、ygendecarburization(AOD),openedthepossibilityofabroadspectrumofnewstainlesssteels.AmongtheadvancesmadepossiblewiththeAODwasthede-liberateadditionofnitrogenasanalloyingelement.NitrogenalloyingofduplexstainlesssteelsmakespossibleHAZtoughnessandcorrosionresistancewhichapproachestha

8、tofthebasemetalintheas-weldedcondition.Withincr