以某钢厂生产的HRB335钢筋和在其基础上加入一定量氮化钛铁的钢筋为原料,通过金相显微镜、扫描电镜、透射电镜等试验方法对氮化钛铁强化钢筋的原理进行研究。结果表明:氮化钛在凝固过程中大量析出,促进了铁素体晶粒的形核,细化了铁素体晶粒,从而起到了提高强度的同时增强韧性的作用;采用萃取复型法得到的析出物主要成分为钛的碳氮化物以及少量的复合氧化物,碳氮化钛的大小通常在10 nm以下,数量多,分布广;由此表明氮化钛铁用来作为生产HRB400热轧带肋钢筋的合金元素具有相当的可行性。 Based on the HRB335 reinforced steel produced by a steel mill and the steel bar with a certain amount of ferrotitanium added on its basis, the principle of strengthening ferrosilicon titanium ferrites was studied by means of metallographic microscope, scanning electron microscope and transmission electron microscope. The results show that titanium nitride precipitates in a large amount during solidification, promotes the nucleation of ferrite grains and refines the ferrite grains, thus improving the strength and strengthening the toughness. The resulting precipitates are mainly composed of titanium carbonitrides and a small amount of composite oxides. Titanium carbonitrides are usually below 10 nm in size and in large numbers and are widely distributed. This shows that titanium nitride is used as a catalyst for producing HRB400 heat Alloying elements of rolled ribbed steel are quite feasible.