1. School of Materials Science and Engineering, University of Science and Technology Beijing， Beijing 100083, China；2. Metallurgical Technology Institute, Central Iron and Steel Research Institute， Beijing 100081, China
Abstract：Research results on coldbending properties of hotrolled ribbed bar since 1990s in China are summarized. Through study of chemical composition，mechanical properties，grades of inclusions，fractographs and microstructure of the products, it was found that dendritic structures is observed in large ribbed bar with cracks along roots of transverse ribs. The results of heat treatment indicated:that dendritic structure starts to homogenize after heating to 1000 ℃ for 50 min. Uniform F+P microstructure is available at 1100 ℃ for 70 min. According to the theory of recrystallization，the reasons of dendritic formation are analyzed，and measures to improve are proposed.
孟宪成;罗廷梁;冯光宏. 热轧带肋钢筋冷弯时沿横肋根部开裂的机理[J]. 钢铁, 2007, 42(6): 69-0.
MENG Xiancheng;LUO Tingliang;FENG Guanghong. Study on Mechanism of ColdBend Cracking Along Roots of Transverse Ribs in HotRolled Ribbed Bar. Iron and Steel, 2007, 42(6): 69-0.
2007, Vol. 42 
