新标准下热轧带肋钢筋生产工艺的分析

新标准实施后，为了探究热轧带肋钢筋最佳生产工艺，对广东省不同生产工艺的主要钢企生产的钢筋进行了研究。分析表明，采用穿水冷却工艺，试样的强度偏高、韧性偏低，金相组织不合格，部分试样反向弯曲及抗震性能不合格，说明该工艺已严重不符合新标准要求；采用加铬、钼合金化热轧工艺，试样间强度偏差较大，且反向弯曲性能不合格，说明工艺不易控制、产品质量不稳定；采用常规热轧工艺，试样屈服强度偏低，仅高出标准下限1～2 MPa，说明该工艺生产的钢筋强度不够；采用钒氮合金化热轧工艺，试样各项试验指标均良好，当钒质量分数为0.33%～0.36%、氮质量分数为0.022%～0.025%时，产品综合质量最佳。

Analysis of production technology of hot rolled #br#ribbed bars under new standard

Since the implementation of the new standard, in order to explore the best production process of hot rolled ribbed bars, the steel bars produced by major steel enterprises in different processes in Guangdong Province were studied. The analysis showed that using water cooling process, the strength of the steel bar samples was high, the toughness was insufficient, the metallographic structure was unqualified, and some samples were reversely bent and the seismic performance was unqualified, which indicated that the process had seriously failed to meet the new standard. The hot rolling process with the addition of chromium, molybdenum resulted in a large deviation of tensile strength and an unqualified reverse bending performance, which indicated that the process was not easy to control and the product quality was unstable. Using the conventional hot rolling process, the yield strength of the sample was low, only 1 2 MPa higher than the limit of the standard, which indicated that the strength was not enough. Using the vanadium nitrogen alloying hot rolling process, the test indexes of the sample were all good. When the mass fraction of vanadium was 0.33% 0.36%, and the mass fraction of the nitrogen was 0.022% 0.025%, the comprehensive quality of the product was the best.