摘要
国内厂家在生产HRB500E钢筋的过程中均存在强屈比偏低或者少量不合现象.文章对工业试制的铌钒复合钢筋和钒氮钢筋进行了对比试验,结果表明,采用铌钒复合工艺后,钢筋强屈比提高0.04,由于铌元素的存在,推迟了铁素体相变,珠光体含量增加了约10个百分点,使得钢筋抗拉强度提高;由于加入铌后,钒氮合金加入量相对减少,从而降低了钒氮合金析出强化、细晶强化效果,钢筋的屈服强度略有下降.实践表明,采用铌钒复合工艺后,钢筋的强屈比明显提高,HRB500E钢筋抗震性显著提高.
Abstract
In the process of producing HRB500E rebar for domestic manufacturers,there are often low strength-to-yield ratio or a small amount of nonconformity. In this paper,the comparative experiment of niobium vanadium composite rebar and vanadium nitrogen rebar manufactured with industrial trial production is carried out. The results showed that the strength-to-yield ratio of rebar was increased by 0. 03 with the niobium vanadium composite process,ferrite transforma-tion was delayed due to presence of niobium,pearlite content was increased by about 10 percentage points so that tensile strength was increased;vanadium nitrogen alloy was relatively reduced due to the addition of niobium so that its precipitation strengthening and fine grain strengthening effects were reduced as well as yield strength of rebar was slightly decreased. The practices show that the strength-to-yield ratio of rebar and seismic resistance of HRB500E rebar are significantly improved with the niobium vanadium composite process.
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