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通过金相显微镜、透射电镜观察,研究了正火温度对建筑耐火钢组织性能的影响。结果表明:正火后耐火钢组织主要为铁素体与M-A岛,M-A岛含量随着正火温度升高而增加,770℃时,M-A岛含量达到最大值,此后M-A岛随温度升高含量降低。随着正火温度的升高,试验钢的抗拉强度升高,正火温度超过770℃后,抗拉强度开始下降。耐火钢的最佳正火温度为770℃。
The effects of normalizing temperature on the microstructure and properties of building refractory steel were studied by metallographic microscope and transmission electron microscope. The results show that the microstructure of the refractory steel is mainly ferrite and MA island after normalizing, and the content of MA island increases with the increase of normalizing temperature. At 770 ℃, the content of MA island reaches the maximum, and then MA island increases with increasing temperature reduce. With the normalizing temperature increases, the tensile strength of the test steel increases, the normalizing temperature exceeds 770 ℃, the tensile strength began to decline. The best normalizing temperature of refractory steel is 770 ℃.