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通过微观组织观察、力学性能测试等方法,研究了淬回火工艺对预应力混凝土钢棒组织及性能的影响,并优选出淬回火工艺参数。研究表明:对于20Mn Si钢,感应加热淬火的理想温度为940℃。淬火处理后,在400~610℃温度区间回火。随着回火温度的升高,钢棒的强度平稳下降,伸长率逐渐提高;经对比分析确定,最佳回火温度区间为400~450℃。经940℃淬火、400~450℃回火,20Mn Si热轧钢筋试样屈服强度达到800 MPa级,是生产预应力混凝土钢棒较为经济的原料。
The effects of quenching and tempering process on the microstructure and properties of prestressed concrete bars were studied by means of microstructure observation and mechanical property test, and the parameters of quenching and tempering process were optimized. The results show that for 20MnSi steel, the ideal induction quenching temperature is 940 ℃. After quenching, tempering in the temperature range of 400 ~ 610 ℃. With the increase of tempering temperature, the strength of steel bar decreased steadily and the elongation increased gradually. The optimum tempering temperature range was 400 ~ 450 ℃ after comparative analysis. After quenching at 940 ℃ and tempering at 400 ~ 450 ℃, the yield strength of 20Mn Si hot rolled steel bars reaches 800 MPa, which is a more economical raw material for prestressed concrete bars.