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屈强比是建筑用抗震钢板的重要性能指标。本文以低碳钢板为对象,研究了微合金化元素V、控轧控冷工艺参数对其力学性能与微观组织的影响。结果表明,随终轧温度升高,试验钢的抗拉强度与屈服强度都得到提高,且添加了V的试样的屈强比稍高于未添加V的试样。随终冷温度升高,钢板的屈强比降低,当终冷温度为560℃时,钢板可以获得较高强度与良好屈强比性能。添加V试样的晶粒细化明显,且随终冷温度升高,组织中M-A更加细小,分布更为均匀。
Yield ratio is an important performance index for seismic plates for buildings. In this paper, the effects of microalloying V, controlled rolling and controlled cooling on the mechanical properties and microstructure of low carbon steel were studied. The results show that the tensile strength and yield strength of the test steel increase with the increase of the finish rolling temperature, and the yield ratio of the test specimen with V added is slightly higher than that of the test specimen without V addition. With the increase of the final cooling temperature, the yield ratio of the steel decreases. When the final cooling temperature is 560 ℃, the steel plate can obtain higher strength and good yield ratio performance. The grain refinement of V sample is obvious, and with the increase of the final cooling temperature, the M-A in the tissue is more fine and the distribution is more uniform.