Microstructure and Properties of Q420 30# Large Channel Steel Used for Transmission Towers
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摘要: 通过V微合金化技术,3研发出Q420级30#大规格角钢。采用光学显微镜、拉伸试验和冲击试验等方法系统研究了试验角钢的组织和在室温、0℃、-20℃和-40℃条件下的力学性能。结果表明:在钢中添加微合金元素V可以提高角钢的力学性能, 其组织主要为带状分布的铁素体和珠光体, 不同位置的组织存在差异导致力学性能差异。在不同低温条件下, 拉伸性能稳定。随测试温度的降低, 冲击功明显减小, 但-40℃下冲击功仍有59.34 J, 可达到国家标准规定E级。Abstract: A Q420 grade 30# large gauge channel steel was developed via vanadium micro-alloying. The microstructure and properties of tested steel were systematically investigated by using optical microscope,tensile test and impact test. The results show that the microstructure of test steel is mainly composed of banded ferrite and pearlite. The microstructures difference at different positions result in difference in properties.Under the low temperature condition,tested steel has stable mechanical properties,and with excellent impact toughness,which meets the E-level regulated by national standards.
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Key words:
- large size channel steel /
- V microalloyed /
- microstructure /
- mechanical properties
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