简介：本文通过仔细研究PSB产品的外形特点,探讨了直径为25mm的PSB成品孔型、K2孔孔型、成品机架刻槽设计思路及采用的具体方法,成功的开发出25mmPSB孔型系统。经过试轧,轧出了外形尺寸符合国标要求的￠25mmPSB产品。

简介：本文通过探究锰硅合金中硫元素的来源,从生产过程控制的环节即配料硫负荷含量、渣碱度、铁水浇铸等方面阐述降低合金硫元素而采取的方法,以达到降低合金硫元素的目的。

简介：SomenewNi-saving25Crduplexstainlesssteels(DSS)havebeendeveloped.Theresultsindicatethatthealloyhasabalancedferrite-austeniterelationafterhotforgeandsolidsolutiontreatmentat1000℃.TheelementsWandCuhaveamarkedeffectonthemicrostructureofthealloy.ThepittingpotentialofthesteeladdingWandCuelementsreachesthemaximumvalueof435mV.Thetensilestrengthandpercentageofareareductionofallsteelsinthispaperare800-900MPaand60%-70%,respectively.Thetensileelongationsofthealloysareallabove30%.Theexperimentalsteelshavegoodcorrosionandmechanicalproperty.

简介：通过分析并制定焊接工艺,实现了Q345-E与ZG25CrMo异种钢的焊接,是CO2气体保护焊实践中的推广与应用。

简介：介绍了厚规格Q390GJC-Z25高强度钢板的研发工艺及试制过程。试制结果表明:采用Nb、V、Ti复合微合金化、控轧控冷、正火热处理工艺生产的厚规格Q390GJC-Z25钢板组织均匀、晶粒细小,各项力学指标均符合国标要求,探伤达到Ⅰ级。

简介：Improvingtheunitheatefficiency,reducingcoalconsumptionandtheemissionofCO2andmeetingtherequirementsofenvironmentalprotectionandenergyconservationisthegoaloftheboilerandthepowerindustry.Developmentsoflargecapacityandhighparameterultra-supercritical（USC）unitsarethetendencyofthepowerindustry.ThereisnodoubtthatthedevelopmentofUSCunitsisbasedonthedevelopmentofmaterials,especiallythematerialsusedforsuper-heaterandreheaterinhigh-temperatureUSCboiler.Duetothelongtimeexposuretotheharshenvironment,suchasbearingthe600℃steamoxidation,andwithstandingthecorrosivefluegasandflyasherosion,thematerialsrequirenotonlygoodhigh-temperaturestrength,butalsoagoodcorrosionresistance.Inconsiderationoftherequirementscitedabove,foreigncountrieshaddevelopedTP310HCbN（07Cr25Ni21CbN）austeniticheat-resistantsteel.However,thedomesticdemandsforthismaterialstilldependonimportandthecostishigh,sotheboilerandthepowerindustryexpectseagerlythatthesesteelscanbeproducedbydomesticmetallurgicalindustry,especiallyBaosteel,toreplacetheimportedproducts.Inordertosatisfytherequirementsofdomesticmanufacturingsuper-heaterandreheaterusedinultra-supercriticalpowerboiler,afterdevelopedT23、T91、T92、S30432highpressureboilertube,BaosteelbegantodevelopTP310HCbN（07Cr25Ni21CbN）austeniticstainlesssteeltubeinJanuaryof2007.Thisstudydescribesthecompositiondesign,themanufacturingprocessofproduct,andtheassessmentofperformanceofBaosteel’sTP310HCbN（07Cr25Ni21CbN）.ThedataindicatesthatpropertiesofBaosteel’sTP310HCbN（07Cr25Ni21CbN）conformtotheASMESA-213standardandGB5310standard,soitcansubstitutetheimportedproductsandissuitableformanufacturingpowerstationboilerofgreatcapacityandhighsteamparameters.

简介：针对低合金钢板Q345CZ25出现批量性厚度方向性能偏低的情况,通过分析铸坯低倍、成分,比较质检试验方法,并借助电子显微镜、扫描电镜观察不合试样微观组织等,确定钢中富含MnS及NbC夹杂是导致钢板厚度方向性能不合的主要原因。

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。