COLUMBIUM AS A MICRO-ALLOYING ELEMENT IN STEELS AND ITS EFFECT ON WELDING TECHNOLOGY

摘要

Weldability as a Metallurgical Concept - A DefinitionnWeldability as a Problem Complex in Steel MetallurgynMicro-Alloy SteelsnGeneral Influence of Columbium as a Micro-AlloyingnElement in SteelnMetallurgical VariablesnBasic Properties of Columbium Steels Versus ProcessingnVariablesnProperties vs. CompositionnProperties vs. Rolling ConditionsnProperties vs. Heat TreatmentnThree PostulatesnSpecial Properties of Columbium Steels vs. WeldingnTechnologynApplication of Columbium Steels to Welding FabricationnColumbium as Part of Complex Steel AlloysnAcknowledgmentnReferencesnAppendix AnThe NC-testing MethodnAppendix BnThe NWK -testing MethodnAppendix CnSummary of Recent InvestigationsnAppendix DnExtract of Investigation for the Official Approval of Columbium Micro-Alloy Steel as Pressure Vessel Material According to Requirements of Swedish Authorities