简介:Opticalmicroscope,stereomicroscope,scanningelectronicmicroscope(SEM)andmechanicalpropertytestingwereusedtoresearchtheeffectsofdifferentquenchingtemperaturesonthemicrostructureandmechanicalpropertiesoftheH13mandrelsteel.Theresultsindicatethatfollowinganincreaseinthequenching,thedegreeofalloyingisenhancedduetothecarbidesdissolvinggraduallyinaustenite,whichimprovesthehardenabilityofthespecimens,aswellastheirroomandhigh-temperaturestrength.Atthesametime,thefracturetoughnessincreasesduetotheincrementofthemartensitenumberandtheinterparticledistanceofthecarbides.However,extremelycoarsegrainandmartensitecandecreasetheimpacttoughness.Optimalperformancecanbeobtainedafterquenchingat1060℃anddoubletemperingat620℃.Consequently,theservicelifeoftheH13mandrelsteelisextendedsignificantly.
简介:通过对耐大气腐蚀钢SPA—H的成分设计、冶炼过程及轧制过程的控制,生产出尺寸公差、表面质量及各项性能都符合JISG3125—1987标准要求的SPA—H钢带。
简介:氪、氙是空气中的稀有气体,由于具有一定的特性,使氪、氙应用前景广泛,空分中存在多种稀有气体,其中氪、氙含量最少,由于提取工艺复杂,价位高昂,俗称"黄金气体",空分中的氪、氙主要在液氧中,通常伴随产品氧气或液氧排出而被带走,随着空分设备日益大型化,提取氪、氙的原料气液氧产能增加,从液氧中提取氪、氙蕴藏着巨大经济前景。
简介:Baosteel's60000m3/hairseparationunit(ASU),thefirstdomestically-integratedunitofitsclass,isamilestoneintheChineseairseparationindustry.Inthispaper,theprocesscharacteristicsoftheunitandtheapplicationoftheoriginaltechniquesareexpatiated.Somedifficultiesintheprocessdesign,theriskcontrol,thequalitycontrol,thecontrolsystemintegrationandthesystemcommissioningareanalyzedandappraised.Themodeoftheprojectintegrationandinnovation,thecooperationamongindustriesandtheuser-orientatedprojectmanagementmodeareintroduced.Finally,thesuccessfulexperiencesininnovationaresummarizedwiththefocusontheintegrationoftheproject.
简介:本文从酒钢3×6000Nm~3/h制氧生产工艺及其控制设备的现状出发,介绍了改造后DCS控制系统软、硬件的构成和实现的主要功能,取得了良好的应用效果。
简介:Baosteel'sNo.8airseparationunit(ASU)isthefirstdomestically-integrated60000m3/hASU.Thispaperdescribesthemechanicalequipment,thedesignandtheconfigurationcharacteristicsofthisunit.ThepotentialfailuremodesofthemechanicaldevicesarededucedviaanalysesonthefailurehistoryofsimilardevicesinotherASUs.Finally,thispaperalsobringsupsuggestionsondailymaintenance,overhaulandpurchasesofspareparts.