Abstract: The strengthening mechanism of effect of vanadium on structure and properties of hot rolled rebar (0. 21 〜 0. 23C, 1. 33 ~ 1. 50Mn) has been studied by alloying using V-N and ferrovanadium alloy. Results showed that the mechanical properties of 0. 06V rebar were up to the requirement of HRB400 grade and HRB500 grade rebar with alloying respectively by using ferrovanadium alloy and V-N alloy； with same vanadium content, the ratio of precipitates in rebar aloyed by V-N alloy was by 83% ~ 110% more than that alloyed by ferrovanadium. The precipitate strengthen effect in rebar alloyed by V-N was stronger than that in rebar alloyed by ferrovanadium alloy, and main precipitate was V( CN) with less VC. The structure of rebar alloyed by V-N alloy was finer and the steel rebar had plenty of free nitrogen with obviously age- ing phenomena.

摘要： 利用钒氮合金和钒铁合金进行合金化,并研究了钒对热轧带肋钢筋(0.21%～0.23%C、1.33%～1.50%Mn)组织和性能的作用机理。结果表明,采用钒铁合金化、钒氮合金化方法,使含0.06%钒钢筋分别达到HRB400级、HRB500级钢筋的力学性能要求;同样钒含量,钒氮合金化的钢筋中析出比例比钒铁合金化高83%～110%,钒氮合金化的钢筋沉淀强化作用比钒铁合金化更强,析出物以V(CN)为主,VC析出量少。钒氮合金化能使钢的室温组织更细小,但游离氮较多,时效现象将更加显著。

关键词: 带肋钢筋, 钒, 析出物, 强化机理