Material selection and acceptance of fracture resistance for high strength and toughness weather-resistant bridge steel of Q690qNH
PENG Ning-qi1, FU Gui-qin2, ZHOU Wen-hao1, FAN Ming1, XIONG Xiang-jiang1, ZHU Miao-yong2
1. Technology and Quality Department, Hunan Valin Xiangtan Iron and Steel Co., Ltd., Xiangtan 411101, Hunan, China; 2. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：For the 40 mm thick Q690qNH weathering steel plates for bridge produced by TMCP+T and QT processes, tensile tests on longitudinal surface, longitudinal 1/4, longitudinal center and transverse surface at room temperature and Charpy V-shaped impact tests at -120 -+20 ℃ were carried out according to GB/T 228.1—2010 and GB/T 229—2020 standards respectively, and series temperature dynamic tearing tests of -120-+20 ℃ and type P2 non-plastic transition temperature drop hammer tests on longitudinal surface, longitudinal central and transverse surface were carried out according to GB/T 5482—2007 and GB/T 6803—2008 standards respectively, and longitudinal crack tip opening displacement (CTOD) tests and full-thickness deep notched wide plate tensile tests were carried out according to GB/T 21143—2014 and Q/725-1182—2005 standards. Then the experimental data and their correlations were analyzed, at the same time, the metallographic structure of different thickness of steel plate of two kinds of process were observed by using optical microscope, and the fracture morphology of experimental CTOD samples were observed by scanning electron microscope (SEM), and combining with the failure assessment FAD diagram of BS 7910 and the estimation of fracture driving force of typical bridge welded members, the material selection and acceptance method of fracture resistance for high strength and toughness weathering bridge steel Q690qNH were discussed. Results show that the steel plate with QT process has more uniform strength in transverse, longitudinal and thickness directions, and its plasticity, impact, dynamic tear, CTOD and fracture toughness KC are better, and can be used as D-class steel for key components. However, if it is used as E-class steel, even for general components, there is a certain risk. While the steel plate with TMCP+T process has poor fracture toughness, and even as D-class steel, it does not meet the requirements of material selection based on fracture resistance. It also shows that the rapid increase of brittleness starting temperature at 1/4 thickness of longitudinal impact test has good reliability and applicability as the breaking criterion and acceptance of test Q690qNH weather-resistant bridge steel. When used as a key component, the fiber area ratio at 1/4 thickness of longitudinal impact fracture should be higher than 97.5% and the corresponding impact energy should not be less than 125 J.
彭宁琦, 付贵勤, 周文浩, 范明, 熊祥江, 朱苗勇. 高强韧耐候桥梁钢Q690qNH的防断选材及验收方法[J]. 钢铁, 2022, 57(3): 97-107.
PENG Ning-qi, FU Gui-qin, ZHOU Wen-hao, FAN Ming, XIONG Xiang-jiang, ZHU Miao-yong. Material selection and acceptance of fracture resistance for high strength and toughness weather-resistant bridge steel of Q690qNH[J]. Iron and Steel, 2022, 57(3): 97-107.
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2022, Vol. 57 
