Niobium-bearing structural steel products and 2013 application technologies

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• 作者：Jansto Steven
• 会议时间：2013-06-01
• 关键词：beams ; fire-resistant ; high-strength steel ; niobium ; seismic-resistant rebar ; structural steel
• 作者单位：CBMM-North America,Pittsburgh,USA
• 母体文献：第五届宝钢学术年会论文集
• 会议名称：第五届宝钢学术年会
• 会议地点：上海
• 主办单位：中国金属学会
• 语种：chi

摘要

The technological development of value-added applications for niobium ( Nb) microalloyed structural steels continues globally for both low and high yield strength applications.The civil engineering and end user community demands structural bars,shapes,beams and plates with improved properties.Properties such as toughness,better fire and seismic resistance,yield-to-tensile ratio consistency and improved weldability are end user desires for both low and high yield strength construction applications.Nb-bearing steels continue to be developed to address more demanding seismic and fire resistant applications in both the low and high yield strength construction sector.These new technologies and market dynamics are described.For example,several mills within the construction beam sector have adopted the application of 0.02% to 0.04% Nb and reduced the carbon content for lower strength ( S355 and S420) steels with improved mechanical property performance and weldability compared to traditional peritectic construction steel grades.Operational cost reductions are experienced by the steel producer as well when the Nb low carbon low alloy concept is adopted.Advanced Nb-bearing high strength structural steels have also been developed.Another evolving Nb product segment involves the high carbon long product pre-stressed concrete wire rod market.Micro additions of 0.005% to 0.020% Nb exhibit improved wire drawability during manufacturing as well as improved mechanical properties compared to traditional non-Nb bearing high carbon steels.