Ultra-steelProjectperformedatNationalInstituteforMaterialsScience(NIMS)1997-2005proposed'Breakthroughsforinnovationbysteelscience'.Themainconceptswerecomposedofdecreasingtheenvironmentalload,noorlessspecialalloyingelementsandsaferinfrastructurewithreducedthetotallifecost.Four'doublestrengthanddoublelife'steelsweredevelopedasfollows:①800MPa-classecologicallybeneficialsteelsforweldedstructures,②1500MPasteelswithhighresistancetofracture,③advancedferriticsteelsfor650C-USCboilersand④Ultra-steelsforstructuresinmarineandoffshoreenvironments.Worldsteelsocietyisstillgrowingwiththreateninglimitsofresourcesandenergy.Applicationoftheultra-steelideaswouldbeincreasinglyhelpfulfortheglobalsustainability.ThetalkwillintroducetherecentprogressinsteelresearchatNIMS,basedontheprojectaccomplishments.
