引張強さ 1420 MPa 以上の PC 鋼棒の一様伸びに及ぼす Si の影響

概要

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Recent antiearthquake design is on the basis of ultimate state design which aims absorption of earthquake's energy by plastic deformation of buildings. From this point of view, it is required that deformability of buildings' pile should be improved much more. Inside pile, steel bar for prestressed concrete (PC-bar) is used for reinforcement. One of the main factors which affect deformability of the pile is uniform elongation of PC-bar. Therefore it is pointed out that the PC-bar with high uniform elongation is indispensable. It is known that high uniform elongation is attained by dual phase in the case of lower strength steels. But study which treats with high strength steels such as 1420 MPa grade PC-bar is quite few. In this paper, we focus on Si and study the effect of Si on ductility of high strength steels. Finally we found that uniform elongation was improved to 5% by 3.5% Si addition. Improvement on uniform elongation by Si addition is mainly attributed to appearance of ferrite and refinement of carbide.
社団法人日本鉄鋼協会の論文
1999-01-01