Low-cost high-speed bar deformed steel bar with thickness of surface oxide scale being more than 10 [mu] m

The invention provides a low-cost high-speed bar deformed steel bar with the surface scale thickness of 10 microns or above. The high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: 0.20-0.25 Wt% of C, less than or equal to 0.35 Wt% of Si, 0.8-1.1 Wt% of Mn, less than or equal to 0.045 Wt% of P, less than or equal to 0.045 Wt% of S, 0.015-0.035 Wt% of Nb, less than or equal to 0.009 Wt% of N and the balance of Fe. The thickness of the oxidized scale on the surface of the steel bar produced by double-line two-cutting is increased to 10 microns and above, and the thickness of the oxidized scale on the surface of the steel bar produced by a single line is increased to 12 microns and above. 本发明提供了一种低成本且表面氧化铁皮厚度10μm以上的高速棒材螺纹钢，所述高速棒材螺纹钢的化学成分按重量百分比为：C：0.20～0.25Wt％，Si：≤0.35Wt％，Mn：0.8～1.1Wt％，P：≤0.045Wt％，S：≤0.045Wt％，Nb：0.015～0.035Wt％，N：≤0.009Wt％；其余为铁和不可避免的杂质，双线两切分生产的钢筋表面氧化铁皮厚度提高到10μm及以上，单线生产的钢筋表面氧化铁皮厚度提高到12μm及以上。