简介:The18Ni300gradecobalt-freemaragingsteelT300wassuccessfullymanufacturedonanindustrialscalebyapplicationofvacuuminductionmelting(VIM)andvacuumarcremelting(VAR)processatBaosteel.WiththecontentofOandNlessthan15ppmand10ppmrespectively(1ppm=10-6),theT300steelproducedbyBaosteelobtainedahighdegreeofpurityandagoodcombinationofultra-highstrengthandfracturetoughness.Theeffectsofsolutiontemperatureandageingtemperatureontensilepropertyofsolution-treatedandagedT300steelwereinvestigated.Theresultsshowthatthesolutiontemperatureslightlyinfluencesthestrengthofthesolution-treatedsteel,indicatingthatthesolutionstrengtheningratherthanthegrainboundarystrengtheningismoreimportanttothesolution-treatedsteel.Forthesolution-treatedT300,theelongationandreductionofareadon'tchangemuchwitharisingsolutiontemperature,andremainabove17%and70%respectivelyatthesolutiontemperaturerangingfrom800℃to1200℃.FortheagedT300steel,thestrengthandelongationarereducedwithanincreasingsolutiontemperature,andthesolutiontemperaturehasagreatereffectonthereductionofareathanthatontheelongation.Thereductionofareaoftheagedsteelreachesahighpeakwhenthesolutiontemperaturereaches920℃.Theexperimentaldataindicatesthatprecipitationstrengtheningmakesacontributionof1100MPatothetensilestrengthoftheagedsteel.Theageingtemperatureexertsagreatereffectonthestrengththanontheelongationandreductionofarea.Thesteelachievesabettercombinationofstrengthandtoughnessatthepeakageingtemperatureof500℃.
简介:摘要:针对国产碳纤维树脂基复合材料T300层合板,在70°水浸的条件下进行饱和湿热处理,当碳纤维体积含量分别为58%,65%,70%时,按相关标准测量其在室温下的0°拉伸强度,0°压缩强度,弯曲强度,层间剪切强度,弹性模量。结果表明:在湿热处理后,65%纤维体积含量的试件,压缩强度、弯曲强度和层间剪切强度值下降最少,70%纤维含量的试件,拉伸强度值下降最少,受湿热影响最大的是58%纤维含量的试件,强度下降最明显。湿热处理后弹性模量的下降与纤维体积含量有关,纤维含量越高弹性模量下降越低,70%纤维含量的试件的弹性模量下降最少。
简介:Throughsummaryandextractionofcurrentsteelmakingdesign,processandequipmenttechnologiesandproductiontechnologiesfor300tgradeconvertersinBaosteel,thearticleanalyzesandelaboratesthesignificanceofindependentintegrationof300tgradeconvertersinZhanjiang,majortargetsoftheindependentintegrationinconverterprocesstechnologies,equipmentpackagesandcontrols,theinnovatedcriticaltechnologiesandcomparisonwithoverseasadvancedtechnologies,majortechnicaldifficultiesintheintegrationinBaosteelandtheirsolutions,aswellasgeneralmindsetandfinalobjectivesoftheproject.ThetotalintegrationoftechnologyforShanghaiNo.1SteelMakingPlantofBaosteelwasundertakenbyNipponSteel.AndKawasakiSteelwasresponsibleforthetotalintegrationoftechnologyfor4#and5#convertersofShanghaiNo.2SteelmakingPlantofBaosteel.Basedondigestion,absorptionandinnovationoftheintroducedtechnologies,Baosteelhasfirstlyachievedtheindependentintegrationof6#converter,5#RHand3#LFprojectsintheShanghaiNo.2SteelmakingPlantofBaosteel.Therefore,BaosteelshalltakeadvantagesofthefavorableconditionsandexperiencesandadvancedsteelmakingtechnologiesofBaosteeeltomastertheimportednewsteelmakingtechnologiesintheworldandthenformtheadvancedcompletesetsteelmakingtechnologiesandequipmentathomeandabroad.TheachievementofindependentintegrationofZhanjiangSteelMakingProjectwillmakethebreakthroughfortheconstructionoflarge-sizedsteelmakingplantinBaosteel.300tconvertertechnologyintegrationisundertakenbyBaosteelindependentlyininsteadofbytheforeignsideinthepast.
简介:ApplictionofMgO0-Cr2O3brickcomposedofMgO>72%,Cr2O3>14.8%-168.69%,withporosity13%-14%,compressivestrength33.0-43.8MPa,flexurestrength11.9-16.5MPaandrefractorinessunderload≥1750℃inanassemblesnorkelof300tRHfurnaceinBaoskhanIron&SteelCompany(Baosteel)Showedgoodresultsofaverageservicelifeof106.6heats,maximum119heats.Petrologi-calanalysisandvisualexaminationwerealsodonetotheresidualbricktoinvestigatethewearmecha-nism.