摘要
对高强度低屈强比建筑钢进行力学性能检验和显微组织分析。结果表明：轧制钢的屈强比均符合技术要求，具有良好的冲击性能，Nb系钢强度略低于技术要求，后期可通过回火工艺挽救。Nb系钢最合适的开冷温度为750℃或800℃；Nb＋cr系钢、Nb＋Mo系钢、Nb＋cr＋Mo系钢最合适的开冷温度为750℃。Nb＋Mo系钢析出相数量较多，分布均匀，主要为絮状相和不规则颗粒相，尺寸大小一般小于250nm。絮状相大小一般为10～25nm，主要由Nb＋微量Ti组成；颗粒相尺寸为50～170nm，主要由Nb＋Ti组成。
The research on mechanical property and microstructure of architectural steel with high strength and low yield ratio has been done, and the results show that rolled steel meets the technical requirements and has favorable impact property. The strength of Nb steel is slightly lower than the technical requirements, which can meet them after its tempering. The ideal start cooling temperature for Nb steel is 750℃ or 800 ℃ , that of the rest steels is 750℃. There are many precipitated phases homogeneous distribution in Nb ＋ Mo steel that mainly are flocculent and irregular particles and their size is generally smaller than 250 nm. The flocculation phase composition is mainly Nb as well as a spot of Ti, that of particles is mainly Nb and Ti, their sizes are 10 - 25 nm and 50 - 170 nm respectively.
出处
《工业建筑》
CSCD
北大核心
2014年第3期19-22,27,共5页
Industrial Construction
基金
国家"十二五"科技支撑计划项目(2012BAJ13B01)
关键词
高强钢
低屈强比
组织结构
high strength
low yield ratio
organize structure
