建筑结构用高强抗震耐火H型钢组织性能研究  

Study on Microstructure and Properties of High-strength Anti-seismic Fire-resistant H Beam for Building Structure

作　　者：宋振东[1] 王学敏[2] 谢振家[2] 王敏[1] 惠治国[1] 卜向东[1] 祁祯 Song Zhen-dong;Wang Xue-min;Xie Zhen-jia;Wang Min;Hui Zhi-guo;Bu Xiang-dong;Qi Zhen(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010 [2]北京科技大学,北京100083

出　　处：《包钢科技》2024年第2期58-62,共5页Science & Technology of Baotou Steel

摘　　要：采用TEM、金相显微镜、EBSD等分析手段,研究建筑结构用高强抗震耐火H型钢的微观组织对其强度、韧性及高温强度的影响。结果表明,在合理的化学成分设计前提下,不需要控轧控冷手段,热轧后试验钢获得空冷贝氏体和铁素体两相组织。观察600℃保温3小时后的组织发现,在铁素体内部有纳米级相间析出物存在,析出物的行间距约在24~34 nm之间。热轧建筑结构用高强抗震耐火H型钢的屈服强度≥500 MPa,延伸率≥22%,屈强比≤0.85,-20℃冲击功≥34 J,600℃保温3小时后屈服强度≥310 MPa。The effects of microstructure of high-strength anti-seismic fire-resistant H beam for building structure on its strength,toughness and high temperature strength are studied with such analysis means as TEM(transmission electron microscope),metallographic microscope and EBSD(electron back-scattered diffraction).The results showed that the controlled rolling and controlled cooling were not needed under the premise of reasonable chemical composition design,two-phase structure of air cooling bainite and ferrite for test steel after hot rolling was obtained.It is found by observing the microstructure after holding at 600℃for 3 hours that there is nano-level interphase precipitates in ferrite and their line spacing is about 24~34 nm.For the hot rolled high-strength anti-seismic fire-resistant H beam for building structure,its yield strength≥500 MPa,elongation≥22%,yield ratio≤0.85,impact energy at-20℃≥34 J and yield strength after holding at 600℃for 3 hours≥310 MPa.

关 键 词：高强 耐火 组织 性能 

分 类 号：TU511.3[建筑科学—建筑技术科学] TG142[一般工业技术—材料科学与工程] TG335[金属学及工艺—金属材料]