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 

机构地区：[1]Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China [2]Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China

出　　处：《Journal of Iron and Steel Research International》2009年第6期63-69,共7页

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)

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.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.

关 键 词：low-carbon bridge steel weathering steel intermediate transformation 

分 类 号：TG146.21[一般工业技术—材料科学与工程] U444.81[金属学及工艺—金属材料]