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研究了添加微量元素V的方法改善20MnSiⅡ建筑工程用钢的力学性能。采用真空冶炼炉对钒铁、氮化锰和氮化硅锰等进行冶炼后,对得到的钢样进行热处理,从而得到目标钢样。当V的含量分别为0.015%、0.025%、0.04%、0.05%,钢样的平均晶粒尺寸分别为8.2、5.5、3.4、1.5μm;随着钒元素含量的增加,晶粒尺寸依次减小,晶粒得到细化。屈服强度和抗拉强度与钒含量关系曲线呈抛物线,在V的含量为0.04%时,屈服强度和抗拉强度出现最大值,分别为886 MPa和1055 MPa;伸长率随着钒含量的增加一直呈增大趋势,伸长率最大可达23.4%。室温下的钢样冲击功最大可达99.8 J。改善后钢样的力学性能满足国家标准GB50204-2002《混凝土结构工程质量验收规范》。
The method of adding trace elements V was studied to improve the mechanical properties of 20MnSiⅡ building steel. After the vanadium iron, manganese nitride, silicon nitride manganese and the like are smelted in a vacuum smelting furnace, the obtained steel sample is heat-treated to obtain a target steel sample. When the contents of V are 0.015%, 0.025%, 0.04% and 0.05% respectively, the average grain sizes of the steel samples are 8.2, 5.5, 3.4 and 1.5μm, respectively. With the increase of vanadium content, , Grain refinement. The relationship between yield strength and tensile strength and vanadium content is parabolic. At V content of 0.04%, the maximum yield strength and tensile strength appear at 886 MPa and 1055 MPa, respectively. With the increase of vanadium content Has been increasing trend, the maximum elongation of up to 23.4%. Steel sample impact energy at room temperature up to 99.8J. After the improvement of the mechanical properties of steel samples to meet the national standard GB50204-2002 “acceptance of concrete structures engineering specifications.”