邯钢桥梁用耐候钢Q345qDNH的开发及应用

为解决桥梁因钢大长期暴露于阳光、大气、水等介质中而使用寿命短,不能适应当代铁路运输发展的需要的问题,急需开发升级换代的桥梁用耐候钢.详细介绍了邯钢参照国家桥梁钢标准GB/T 714-2015,设计4种成分桥梁耐候钢Q345qDNH,进行实验室轧制,得出对应性能和金相组织,并对4种试验钢进行周浸试验,找到各试验钢的耐腐蚀...

Development and application of weathering steel Q345qDNH for bridge of Hangang

In order to solve the problem of long-term exposure of bridge steel to sunlight, atmosphere, water and other media and short service life, which can not meet the needs of the development of modern railway transportation, it is urgent to develop and upgrade the weathering steel for bridge. The design of bridge weathering steel Q345qDNH with four components in accordance with the national bridge steel standard GB/T 714—2015 was introduced in detail, and by rolling in laboratory, the corresponding properties and metallography were obtained. And the circumferential immersion test of four experimental steels were carried out to find the corrosion resistance grade of each experimental steel. Through the comprehensive analysis of performance, metallography and corrosion resistance grade of different composition experimental steel, the melting composition of weathering steel Q345qDNH for bridge was determined, and the reasonable rolling and cooling process parameters were formulated through thermal simulation, and the weathering steel Q345qDNH for bridge with excellent performance was successfully developed.