The choice of proper wire rod for cold rolled ribbed bars(WRRB) is a dominating factor for properties.The paper introduces the development of LL550 for WRRB.

• 冷轧带肋钢筋母材的选用是影响冷轧带肋钢筋性能的关键因素，本文介绍了LL550级冷轧带肋钢筋专用母材的技术开发。