摘要
由于总压下量较小,铁塔用大型角钢的强度和韧性往往偏低。以钒和氮微合金化能提高大型角钢的力学性能及其在不同部位的均匀性。检测了35 mm厚的25号角钢边部和角部的力学性能及显微组织。结果表明:角钢不同部位均达到了460 MPa级的屈服强度,-40℃的冲击吸收能量大于40 J;边部晶粒度约为9级,角部晶粒度约为7. 5级,角部析出相数量比边部多,从而减小了由于晶粒度差异造成的边部与角部之间的强度差异。
The heavy angle steel used for tower exhibits frequently insufficient strength and toughness because of its less total reduction.The mechanical properties and their homogeneity in different positions may be improved by microalloying with both vanadium and nitrogen for the heavy angle steel.The mechanical properties and microstructure in edge and corner of 35 mm thick angle steel No.25 were examined.The results showed that the different positions of the angle steel all reached 460 MPa grade of yield strength and impact absorption energy at-40℃as high as more than 40 J,and that grain sizes were about No.9 in the edge and No.7.5 in the corner,and precipitated phase in the corner was more than that in the edge,thus reducing differnce between the edge and the corner in strength due to their different grain sizes.
作者
李广龙
李文斌
丁宁
金耀辉
方志刚
翟利平
LI Guanglong;LI Wenbing;DING Ning;JIN Yaohui;FANG Zhigang;ZHAI Liping(Iron and Steel Research Institute,Angang Group,Anshan Liaoning 114009,China;Heavy Section Plant of Angang steel Co.,Ltd.,Anshan Liaoning 114009,China;Scientific Quality Department of Angang Steel Co.,Ltd.,Anshan Liaoning 114009,China)
出处
《上海金属》
CAS
北大核心
2019年第1期56-59,共4页
Shanghai Metals
关键词
铁塔
强度
大型角钢
显微组织
力学性能
tower,strength
heavy angle steel
microstructure
mechanical property
