输电铁塔用角钢的应用及低温服役性能研究  

Study on Low Temperature Service Capabilities and Application of Power Transmission Tower Steel

作　　者：杨富尧[1] 李现兵[1] 陈新[1] 韩钰[1] 聂京凯[1] 李正[1] 林群 

机构地区：[1]中国电力科学研究院电工与新材料研究所,北京市海淀区100192 [2]温州电业局,浙江省温州市325005

出　　处：《中国电机工程学报》2013年第1期117-122,共6页Proceedings of the CSEE

基　　金：国家电网科技项目(DG71-11-001)~~

摘　　要：随着中国超特高压输变电工程的迅速发展，输电铁塔用钢的强度等级与发达国家的差距正逐步缩小。然而，国内由于低温引起的倒塔事件却时有发生，铁塔用钢的低温服役能力问题越来越受到关注。该文阐述了输电铁塔用钢的低温服役能力及应用现状，对中国输电铁塔用角钢Q235、Q345及Q420抽样进行室温拉伸和低温冲击性能测试，研究了-75～25℃温度区间角钢的韧脆转变趋势。结果表明：3种角钢的拉伸性能均达到GB／T1591-2008要求；冲击功均随温度升高而增加，Q235及Q345的冲击韧性较好，分别在一5和一15℃时平均冲击功达到34J；Q420在试验温度区间内一直处于脆断状态，25℃冲击功仍小于30J。The gap between strength grade of power transmission tower steel has narrowed gradually against developed countries with the development of UHV transmission project. However, the tower collapsing accidents have happened several times for years due to the low temperature in China. Therefore, the national experts pay more attention to low temperature service capabilities of tower steel. The properties and application situation of power transmission tower steel in foreign counties and China were introduced in detail. Toughness and brittleness of Q235, Q345 and Q420 samples were tested. The tendencies of ductile-brittle transition from -75 to 25℃were investigated. The results show that all the tensile properties of them meet the requirement of GB/T 1591-2008. Impact energies increase as the temperature rises, and the absorbing energies of Q235 and Q345 get to 34 J at -5℃ and -15℃respectively. Q420 has been in the brittle state at the range of testing temperature, and the absorbing energy is less than 30 J at 25 ℃.

关 键 词：输电铁塔 低温 角钢 冲击韧性 韧脆转变温度 

分 类 号：TB754[一般工业技术—真空技术]