Effect of carbon content on the mechanical properties and weather resistance of high performance bridge steels

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Abstract The influence of carbon content on the mechanical properties of high yield strength bridge steel has been investigated. The results show that, the excellent mechanical properties and corrosion resistance were obtained for the steel with carbon content between 0.03 wt.%-0.05 wt.%. According to these results, a weathering bridge plate steel with 0.045 wt.% carbon content has been developed. The appropriate control cooling process has to be taken due to the results of CCT and TTT to ensure both microstructure and mechanical properties. Continuous cooling transformation (CCT) curve of the new developing steel presents that when accelerated cooled is faster than 5��/s, the intermediate transformation products can be formed. The isothermal transformation test (TTT) displays that the intermediate transformation temperature range in 600��~530��. Yield strength of the new developing steels reached 500MPa, the elongation and toughness of which are both excellent.

Key words�� low carbon bridge steel weathering intermediate transformation

Received: 06 May 2008

Corresponding Authors: GUO Jia

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	GUO Jia SHANG Cheng-jia YANG Shan-wu WANG Ying WANG Lian-wei HE Xin-lai

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GUO Jia SHANG Cheng-jia YANG Shan-wu WANG Ying WANG Lian-wei HE Xin-lai. Effect of carbon content on the mechanical properties and weather resistance of high performance bridge steels[J]. Chinese Journal of Iron and Steel, 2009, 16(6): 63-63.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2009/V16/I6/63