Abstract：The effect of carbon content on the microstructure and mechanical properties of Q235B steel for electric power tower fittings was studied by mechanical properties test and microstructural observation of a series of hanging plate fittings with different compositions and five groups of test steels with different carbon contents. The strengthening effect of Q235B steel depended on the composite action of various strengthening methods. With the increase of carbon content, the solid solution strengthening effect in ferrite matrix was enhanced. With the increase of volume fraction of the second phase (i.e., pearlite), the strengthening effect was enhanced. The following conclusions were obtained: the pearlite content in microstructure of Q235B steel increased with the increase of carbon content, leading to the increase of tensile strength but the decrease of plasticity and toughness. As the carbon content (mass fraction) was less than 0.068%, the pearlite content in the structure was low, and the strength of the material decreased. For the sake of service safety of electric power tower fittings, its carbon content in Q235B steel should not be less than 0.068% within the standard range to ensure the sufficient strength.
陈鹏, 刘晓明, 李振荣, 韩少强, 刘明, 钟振前. 电力铁塔金具材料碳含量与组织和性能关系探讨[J]. 冶金分析, 2022, 42(3): 84-89.
CHEN Peng, LIU Xiaoming, LI Zhenrong, HAN Shaoqiang, LIU Ming, ZHONG Zhenqian. Discussion on the relationship between carbon content and microstructure and properties of electric power tower fittings. , 2022, 42(3): 84-89.
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