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以新一代高炉炉壳用钢的开发为背景,采用低Mo或无Mo的成分设计,研究了Mo对热轧态、回火态和正火态低碳钢组织和高温拉伸性能的影响。结果表明,试验钢热轧态组织均为铁素体+珠光体+M-A岛,其屈服强度可保持至400℃而不明显降低;回火后,岛状马氏体组织消失,试验钢屈服强度在室温～600℃范围内随拉伸温度升高而线性下降。Mo的添加提高了回火时第二相的析出温度,并使正火态组织中含有大量M-A岛。含Mo试验钢在回火后具有更高的室温和高温强度,经640℃回火后,其常温屈服和抗拉强度依次为540 MPa和625 MPa,屈强比为0.86,600℃屈服强度保持率为55%。
Based on the development of a new generation of blast furnace shell steel, the effect of Mo on the microstructure and high temperature tensile properties of hot-rolled, tempered and normalized low carbon steel was investigated using low or no-Mo composition design. The results show that the hot rolled microstructure of the test steel is ferrite + pearlite + MA island, the yield strength can be maintained to 400 ℃ without significant decrease; after tempering, island martensite disappeared, the test steel yield strength In room temperature ~ 600 ℃ range with the stretching temperature increases linearly decreased. The addition of Mo improves the precipitation temperature of the second phase during tempering and makes the normalized microstructure contain a large amount of M-A islands. The Mo-containing test steels have higher room temperature and high temperature strength after tempering. After tempering at 640 ℃, the yield strength and tensile strength at room temperature are 540 MPa and 625 MPa respectively, and the yield ratio is 0.86,600 ℃ The rate is 55%.