Effect of Carbon Content on Mechanical Properties and Weather Resistance of High Performance Bridge Steels

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

作者机构：Material Science and Engineering School University of Science and Technology Beijing Beijing 100083 China Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China 

出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)

年 卷 期：2009年第16卷第6期

页      面：63-69页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Item Sponsored by National Natural Science Foundation of China(50571016,50571089) National Key Basic Research and Development Program of China(2004CB619102) National High Technology Research and Development Program of China(2006AA03Z507) 

主　　题：low-carbon bridge steel weathering steel intermediate transformation 

摘      要：The influence of carbon content on the mechanical properties of high yield strength bridge steel has been in- vestigated. The results show that the excellent mechanical properties and corrosion resistance are obtained for the steel with carbon content of 0.03% -0. 05% （mass percent）. According to the results, a new weathering bridge steel plate with carbon content of 0. 045% （mass percent） has been developed. The appropriate controlled cooling process should be taken due to the results of CCT （continuous cooling transformation） and TTT （time-temperature-transformation） to ensure both microstructure and mechanical properties. CCT curve of the newly developed steel shows that when accelerated cooling speed is higher than 5 ℃/s, the intermediate transformation products can be formed. The TTT curve displays that the intermediate transformation temperature ranges from 600 to 530 ℃. Yield strength of the newly developed steels reaches 500 MPa, and their elongation and toughness are excellent.