| Q345NQR2铁路用高强度钢板的开发 |
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| 引用本文： | 王军,王超,崔强,唐春霞,武会宾.Q345NQR2铁路用高强度钢板的开发[J].轧钢,2019,36(3):10-13. |
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| 作者姓名： | 王军 王超 崔强 唐春霞 武会宾 |
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| 作者单位： | 1.南京钢铁集团有限公司研究院，江苏南京210000；
2 北京科技大学钢铁共性技术协同创新中心，北京100083 |
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| 摘 要： | 通过低碳及微合金化学成分设计，研究了始冷温度对低屈强比铁路用Q345NQR2钢组织和性能的影响。结果表明，在相同终轧温度下，随着始冷温度的降低，钢板的屈服强度降低，抗拉强度变化不大。实验钢的组织为铁素体+珠光体，组织内珠光体与铁素体微区维氏显微硬度差不小于14HV时，钢板的屈强比不大于0.73，-40 ℃冲击功大于90 J，满足了铁路车辆用钢的性能要求。
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| 关 键 词： | Q345NQR2钢 力学性能 硬度 显微组织 屈强比 |
| 收稿时间： | 2018-12-21 |
Development of Q345NQR2 high strength steel plate used for railway |
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| WANG Jun,WANG Chao,CUI Qiang,TANG Chun xia,WU Hui bin.Development of Q345NQR2 high strength steel plate used for railway[J].Steel Rolling,2019,36(3):10-13. |
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| Authors: | WANG Jun WANG Chao CUI Qiang TANG Chun xia WU Hui bin |
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| Affiliation: | 1.Jiangsu Province Nanjing Iron and Steel Group Co.,Ltd.，Nanjing 210000,China;
2.Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | The effects of initial cooling temperature on the microstructure and properties of Q345NQR2 steel with low yield ratio were studied by low carbon and microalloy composition design.The results show that at the same finishing temperature,the yield strength of the plate decreases and the tensile strength changes little with the decrease of the initial cooling temperature.The microstructure of the experimental steel is mainly ferrite + pearlite.When the ratio of the Vickers microhardness in the microstructure of the pearlite to the ferrite micro area is more than 14HV,the yield ratio of the steel plate is less than 0.73 and the -40 ℃ Charpy impact energy is more than 90 J.The propeties of testd plate meets the performance requirements of railway use steel. |
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| Keywords: | Q345NQR2 steel mechanical properties hardness microstructure yield ratio |
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