简介：ThisstudyresearchestheeffectsoftherefiningtreatmentonthemicrostructureandthemechanicalpropertiesofH13mandrelsteelandcomparestheseeffectswiththoseoftheconventionaltreatment.Theresultsindicatethatbothcarbideparticlesandgrainswererefined,carbideparticleswereuniformlydistributedbytherefiningtreatment,andtherefore,thestrengthandtoughnessofH13mandrelsteelwereimproved.Rapidcoolingafterthesolutiontreatmentmayinhibitintra-granularprecipitationofcarbideparticles,whichisfavorabletoenhancingtoughness.Consequently,high-performanceH13mandrelsteelcanbeproducedbyproperrefiningtreatment.

简介：Opticalmicroscope,stereomicroscope,scanningelectronicmicroscope(SEM)andmechanicalpropertytestingwereusedtoresearchtheeffectsofdifferentquenchingtemperaturesonthemicrostructureandmechanicalpropertiesoftheH13mandrelsteel.Theresultsindicatethatfollowinganincreaseinthequenching,thedegreeofalloyingisenhancedduetothecarbidesdissolvinggraduallyinaustenite,whichimprovesthehardenabilityofthespecimens,aswellastheirroomandhigh-temperaturestrength.Atthesametime,thefracturetoughnessincreasesduetotheincrementofthemartensitenumberandtheinterparticledistanceofthecarbides.However,extremelycoarsegrainandmartensitecandecreasetheimpacttoughness.Optimalperformancecanbeobtainedafterquenchingat1060℃anddoubletemperingat620℃.Consequently,theservicelifeoftheH13mandrelsteelisextendedsignificantly.

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简介：选择可疑为急性胰腺炎患者50例,其中临床确诊有39例,分别用比浊法、碘-淀粉酶比色法进行血清脂肪酶、淀粉酶二种方法联合检测,结果39例患者中,脂肪酶和淀粉酶阳性率分别为92.3%、69.2%。观察39例确诊病例,8h内抽血检测脂肪酶、淀粉酶,二者都升高;12-24h内,血清淀粉酶达高峰,是参考值的3倍,脂肪酶继续升高;48h后,淀粉酶开始下降,脂肪酶达高峰,大于参考值3倍以上;第3天,淀粉酶降至正常,脂肪酶仍高于正常值上限;第6、8天,淀粉酶雏持正常水平,脂肪酶开始下降,但仍高于正常值上限;第10天后,脂肪酶降至正常。揭示急性胰腺炎时,血清淀粉酶增高时间较短,易漏诊,脂肪酶升高可持续10天,对诊断急性胰腺炎有较高特异性,将脂肪酶、淀粉酶二者联合检测有助于急性胰腺炎的诊断和预后的判断。

简介：近日，经攀长钢钢管公司挤压车间全体职工的努力，新试不锈钢挤压管材06Cr13获得成功，已全部检验合格入库。

简介：ThemicrostructuralchangesofFe83Si4B13amorphousmotheralloyduringtheheatingprocesswereinvestigatedbyLaserScanningConfocalMicroscopy（LSCM）,andthephasetransformationwasdeterminedbytheThermo-Calccalculations.ThedifferencesinthemeltingpointsmeasuredbyDifferentialScanningCalorimetry（DSC）andLSCM,andthoseobtainedbyThermo-Calccalculationswerealsodiscussed.ItisfoundthatthemeltingpointsmeasuredbyDSCandLSCMarerelativelysimilar,whereastheonsetandendofthemeltingtemperaturescalculatedbyThermo-CalcsoftwarearehigherthanthosemeasuredbyDSCandobservedbyLSCM.

简介：Themechanicalandcorrosivepropertiesof00Cr13Ni4Mo(S13-4N)weretestedandcomparedwiththoseof00Cr13Ni6Mo(S13-6).Theeffectsofnitrogenonthepropertiesofthesteelswereanalyzed.Theresultsofthetensileandcorrosiontestsshowthestrength,theductility,andthepittingcorrosionresistanceofS13-4Narehigher,lowerandpoorerthanthoseofS13-6respectively,whentemperedatatemperaturebelow550℃andviceversawhenthetemperingtemperatureishigherthan550℃.TheresultsoftheX-raydiffraction(XRD)andtheelectronbackscattereddiffraction(EBSD)analysesrevealthatinversedausteniteappearsat550℃andtheamountofitpeaksat600℃withthebestductility.AndthetotalamountoftheinversedausteniteinS13-6ismorethanthatinS13-4Nindifferentforms.Nitrogenperformsbetterintermsofstabilizinginversedaustenitewhilenickelismorefavorableforforminginversedaustenite,theamountandstabilityofwhichaffecttheductilityremarkably.ThereasonfortheembrittlementofS13-4Nat450℃canbetheresultofcarbideandnitrideprecipitatingatgrainboundaries.

简介：华菱衡钢（衡阳华菱钢管有限公司）1月20日宣布，其生产的13Cr系列耐腐蚀不锈钢管，已通过实验评定。国家石油管材质量监督检验中心和新加坡一管材实验室，相继出具评价报告，认定该系列产品性能优异。这是衡钢高端产品研发取得的喜人突破。

简介：本文通过将SUS304、SUH409L、06Cr13三种不锈钢在35℃,6%FeCl3＋HCl的混合溶液中进行点腐蚀试验,将腐蚀后腐蚀速率、宏观特征、微观组织特征、形貌特征等进行了阐述及对比,并根据化学成分、微观组织结构、腐蚀后的形貌特征等进行了腐蚀原因分析。