Exploration about the Production of HRB400 Hot Rolled Rebar by Nitrided Ferrotitanium Microalloying Technology
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摘要: 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。Abstract: Strengthening mechanism for rebar with nitrided ferrotitanium is studied by optical microscopy,scanning electron microscopy and transmission electron microscopy,with HRB335 rebar produced by a domestic steel mill and the rebar containing a certain amount of nitrided ferrotitanium based on HRB335 as raw materials,respectively. Experimental results demonstrate that rebar’s strength and ductility are both enhanced as the nucleation of ferrite grain is promoted and ferrite grain is refined by the precipitation of numerous TiN particles produced in the process of solidification. Precipitates obtained by extraction replica method mainly contain a few composite oxides and Ti(C,N) whose size is usually less than 10 nm with multi-wide distribution. So it is quite feasible to use nitrided ferrotitanium as an alloy element to produce HRB400 hot rolled rebar.
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Key words:
- reinforced bar /
- TiN /
- micro-alloying /
- precipitates
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