VN合金化对HRB400钢筋力学性能的影响

研究了添加VFe合金与VN合金生产HRB400钢筋对力学性能的影响及其强化机理。结果表明:采用VN合金生产的HRB400钢筋强度明显提高,VN的细化效果比VFe好,大量细小弥散的V(C,N)析出相是钒氮钢筋强度增加的主要原因。同时分析认为,为确保钢筋力学性能合格,炼钢工序应提高化学成分的均匀稳定性,其中钒含量应控制在0.05%以上,轧钢工序应严格执行加热和停轧降温制度。HRB400钢筋最佳的生产工艺是VN复合微合金化加控轧控冷工艺。

Effects of VN Alloying on Mechanical Properties of HRB400 Hot Rolled Ribbed Bars

Investigates the effects of adding VN alloy and VFe alloy on mechanical properties and their strengthening mechanism of HRB400 hot rolled ribbed steel bar. The results show that the intensity of the HRB400 hot rolled ribbed steel bars produced by VN alloy is improved obviously, the refined effects of VN alloy are better than VFe alloy and a great deal dispersed V(C,N) is the main cause increasing the intensity of VN alloying reinforcing steel bars. At the same time, in order to insure the qualified mechanical properties, the content of main element should be enhanced control for increasing the uniformity and stability of the chemical components, the V content should be controlled than 0.05% in steel making and heating and rolling-cooling schedule should be performed strictly in steel rolling. Therefore the best production process of HRB400 is VN microalloying following controlled rolling and controlled cooling technology.