热轧带肋钢筋时效后拉伸性能变化的研究

研究了HRB335钢筋、HRB400钢筋和英标460MPa级钢筋时效后的拉伸性能变化。结果表明,自然时效后屈服强度呈下降趋势,可降低20～30MPa,抗拉强度变化不大,伸长率略有上升;一般钢筋自然时效15～30d后拉伸性趋于稳定,穿水冷却钢筋60～180d后拉伸性能才趋于稳定;可用200℃×1h的人工时效工艺模拟自然时效。这为钢筋的检验和使用提供了有益的参考。

Research on the aging-after tensile property of the reinforced bar

In this paper,the variations of tensile properties of various reinforced bar aging are researched .The results show that yield strength tends towards reduction after aging;the amount of reduction is about 20- 30MPa;the variation of tensile strength is little;the elongation is slightly increased.Generally,the tensile property of reinforced bar tends towards being stabilized after nature aging 15-30 days.The tensile property of remained heat treatment reinforced bar tends towards being stabilized after nature aging 60-180 days.Natural aging can be properly imitated by 200℃×1h artificial aging.It affords useful references for checking up and using the reinforced bar.