Q345GNH耐候钢端梁开裂分析研究  

Analysis and Study on Cracking of Q345GNH Weathering Steel End Beam

作　　者：孙淑侠 潘文欢[2] Sun Shu-xia;Pan Wen-huan(Wuhan Institute of Shipbuilding Technology,Hubei Wuhan 430051;China Classification Society Wuhan Rules&Research Institute,Hubei Wuhan 430022)

机构地区：[1]武汉船舶职业技术学院,湖北武汉430050 [2]中国船级社武汉规范研究所,湖北武汉430022

出　　处：《内燃机与配件》2024年第22期37-39,共3页Internal Combustion Engine & Parts

基　　金：湖北省教育厅科学技术研究项目“智能仿真技术在船舶锚泊舾装中的应用研究”(B2020375)。

摘　　要：Q345GNH耐候钢已广泛应用于集装箱、铁路车辆、桥梁等需要耐大气腐蚀的环境中。本文对Q345GNH耐候钢端梁开裂情况进行宏观检查、化学成分分析、金相检查、力学性能分析和断口分析等,对开裂产生的原因进行了讨论,提出了该耐候钢酸溶铝的含量过低以及微量元素P在晶界的偏聚是其室温韧性显著偏低、易于发生脆裂的主要原因,为业界处理类似问题提供借鉴。Q345GNH weathering steel has been widely used in environments such as containers,railway vehicles,bridges,etc.that require resistance to atmospheric corrosion.This article conducts macroscopic inspection,chemical composition analysis,metallographic examination,mechanical property analysis,and fracture analysis on the cracking of Q345GNH weathering steel end beams.The causes of cracking are discussed,and it is proposed that the low content of acid soluble aluminum and the segregation of trace element P at grain boundaries are the main reasons for the significantly low room temperature toughness and susceptibility to brittle cracking of the weathering steel.This provides a reference for the industry to deal with similar problems.

关 键 词：Q345GNH 耐候钢 开裂 酸溶铝 

分 类 号：TU511.38[建筑科学—建筑技术科学]