Economical 500MPa-grade steel bar and preparation method thereof

The invention discloses an economical 500MPa-grade steel bar and a preparation method thereof. The economical 500MPa-grade steel bar comprises 0.20-0.25 wt% of C, less than or equal to 1.60 wt% of Mn,less than or equal to 0.80% of Si, less than or equal to 0.045% of P, less than or equal to 0.045% of S, more than or equal to 0.05% of Ti and the balance iron and inevitable impurity elements. The key Si content of the preparation method is achieved by silicomanganese and ferrosilicon alloy, and ferrotitanium is added in the tapping process; and compared with an existing 500 MPa-grade traditional vanadium and niobium hot rolling process, the alloy consumption is low, no precious metal element is contained, economical efficiency is achieved, and the cost can be reduced. 本申请公开了一种经济型的500MPa级别钢筋及其制备方法，包含的组分及重量百分比为：C：0.20~0.25wt%，Mn≤1.60wt%，Si≤0.80%，P≤0.045%，S≤0.045%,Ti≥0.05%，其余为铁及不可避免的杂质元素；其制备方法的关键Si含量由硅锰、硅铁合金带入，出钢过程添加钛铁；与现有500MPa级别传统钒、铌热轧工艺相比，合金消耗低，不含贵重金属元素，经济节约，有利于降低成本。