1. Mechanical and Electronic Department, Xuzhou Institute of Technology, Xuzhou 221008, Jiangsu, China; 2. Materials Science and Engineering Postdoctoral Working Station, Harbin Institute of Technology, Harbin 150002, Heilongjiang, China;3. College of Mechanical Engineering, Qiqihar University, Qiqihar 161006, Heilongjiang, China; 4. Technology Center, Anyang Iron and Steel Group Corp., Anyang 455004, Henan, China
Abstract：In order to increase the earthquakeresistance of highrise buildings, the steels used must possess strong consistency in plastic deformation,due to low yieldstrength ratio. Therefore, the yieldstrength ratio is an important parameter to judge the earthquakeresistance of the steels.The experiments of controlled rolling and controlled cooling for different steel grades were carried out. And the effects of chemical composition, ferrite grain size,content of pearlite and bainite and M/A islands on yieldstrength ratio were studied and regression formulas for yield and tensile strength were obtained.
2007, Vol. 42 
