简介:Thispaperstudiesthechemicalcomposition,tensileproperties,inclusions,metallogrophicstructure,andothersuchparameterstoidentifythecausesofcrackingduringthebendingofhigh-strengthsteel.Theresultsshowthatthemajorcausesofcrackingaretheoriginaltransversecracksorholesonthesurfaceoftheslabandthepresenceofscalesrolledintothecracksorholes.Coldfracturingfromsuchdefectsisrare,andcanbeeleminatedbyenhancingthecontrolofthesteelmakingprocessandbymechanicalclean-upofthesurfacecracksandholesintheslab.
简介:Thestudyintroducesthechemicalcomposition,mechanicalproperties,physicalpropertiesandproductionprocessesoftheFe-23Mn-2Al-Vausteniticsteel.Investigationsweremadeintotheformationofcracksinthehot-rolledFe-23Mn-2Al-Vsteelplates,withopticalmicroscopy(OM),scanningelectronmicroscopy(SEM)andenergydispersivespectrum(EDS).Theresultshaveshownthatintergranularoxidationinthereheatingfurnaceisthemaincauseofthecracksonthesurfaceofthehot-rolledsteelplates.Thesurfacecrackingcanbelargelyavoidedbycontrollingtheremainingoxygencontentinthereheatingfurnaceandimprovingcontinuouscasting(CC)processestoincreasethethicknessoffineequiaxedgrainlayerofthesteelslabs.
简介:Inthedirectfiredfurnaceofacontinuousannealingline,sealrollsaresusceptibletodeformationthatleadstosurfacedefectsofsteelstrips.Accordingtofailureanalysis,thereasonsincludeimproperstructuraldesignandheatimbalance.Animproveddesignhasbeenproposedtoreducestressconcentrationandthermalradiation.Aheattransfermodelhasbeenemployedtodeterminetheproperwaterflowrateforrollcooling.Industrialapplicationprovesthatsealrollswiththenewdesignhaslessdeformationandlongerservicelife.