本文通过铁路货车腐蚀情况调研，完成高强耐蚀车体用钢设计，研究试验钢奥氏体动态再结晶行为，获得同流变应力本构关系方程；开展390MPa 级高铁转向架用钢多性能优化分析；在实验室分别完成高强耐蚀车体和高铁转向架构架试验钢连续冷却转变行为，并完成两种钢板的系列热轧实验。高强耐蚀车体用钢采用Cr-Cu-Sb 复合优化成分设计，固化锑锭加入时机，保证锑含量的稳定控制，采用高炉铁水→铁水预处理→转炉炼钢→LF 炉→板坯连铸流程获得均质化连铸坯；通过热轧工序，获得高强耐蚀车体用钢板卷；各项性能指标满足500MPa 级要求，（R=0）指定寿命2×106 次循环下的条件疲劳极限为220MPa，采用TH550-NQ-Ⅱ焊丝气保实芯焊丝焊接高强耐蚀车体用钢表明焊接性能优良，全浸试验表明相对于Q345B 的腐蚀速率为0.69%，满足25 年服役寿命要求。

高铁转向架构架用钢冶炼流程为高炉铁水→铁水预处理→转炉炼钢→炉外精炼LF 炉→RH 炉→板坯连铸（电磁搅拌）→堆垛缓冷48h，获得高洁净、均质化连铸坯；通过再结晶和非再结晶区域两阶段轧制，并配合冷却制度、高能力矫直设备、超声波探伤获得质量优异的钢板；各项性能指标满足390MPa 级要求，（R=0）指定寿命1×107 次循环下的条件疲劳极限为190MPa，采用TH550-NQ-Ⅱ焊丝气保实芯焊丝焊接高铁转向架构架用钢表明焊接性能优良，周浸腐蚀试验相对Q345B 的腐蚀速率为57.7%，满足30 年服役寿命要求。根据GB/T2970 完成并通过高铁转向架构架钢板Ⅰ级超声波探伤。建立高强耐蚀车体和高铁转向架构架用钢示范生产线各1条。

In this paper, the design of high-strength corrosion-resistant steel for car body is completed by investigating the corrosion situation of railway freight cars, and the dynamic recrystallization behavior of austenite of the test steel is studied, and the constitutive relation equation of cocurrent variable stress is obtained. Carry out multi-performance optimization analysis of steel for 390MPa high-speed rail bogie; In the laboratory, the continuous cooling transformation behavior and a series of hot rolling experiments of high-strength corrosion-resistant car body and high-speed rail bogie frame test steel were completed respectively. The steel for high-strength corrosion-resistant car body adopts Cr-Cu-Sb composite optimized composition design, the addition time of solidified antimony ingot, and the precise control of smelting and rolling process to obtain the steel plate coil for high-strength corrosion-resistant car body. Every performance index meets the requirements of 500MPa level, and the conditional fatigue limit under the specified life of 2×106 cycles (R=0) is 220MPa. the welding performance of high-strength corrosion-resistant car body steel with TH550-NQ- ⅱ welding wire is excellent, and the total immersion test shows that the corrosion rate is 0.69% compared with Q345B, which meets the service life requirements of 25 years. High-quality steel plates were obtained by high-clean and homogeneous smelting technology, combined with controlled rolling and controlled cooling process and ultrasonic flaw detection. All performance indexes meet the requirements of 390MPa, and the conditional fatigue limit under the specified life of 1×107 cycles (R=0) is 190MPa. The welding performance of steel used for bogie frame of high-speed railway by using TH550-NQ-Ⅱ welding wire with gas shielded solid core shows excellent welding performance, and the corrosion rate of the steel compared with Q345B in the cycle corrosion test is 57.7%, which meets the requirements of 30 years service life.

According to GB/T2970, I-class ultrasonic flaw detection of steel plate of high-speed rail bogie frame was completed and passed. Establish one demonstration production line for high-strength corrosion-resistant car body and one demonstration production line for high-speed rail bogie frame.