500B port standard steel bar produced through double-line high-speed bar and method

The invention provides a 500B port standard steel bar produced through a double-line high-speed bar and a method, the double-line high-speed bar is rolled in a two-slitting mode, and the double-line high-speed bar comprises, by weight, 0.18%-0.22% of C, 0.40%-0.70% of Si, 1.30%-1.50% of Mn, smaller than or equal to 0.045% of P, smaller than or equal to 0.045% of S, 0.020%-0.030% of Nb, 0.050%-0.080% of V and the balance Fe; the rolling specification of the double-line high-speed bar ranges from phi 10 mm to phi 20 mm. According to the double-line high-speed bar, the yield ratio is larger than or equal to 1.27, the ductility and toughness Agt is larger than or equal to 12%, and the anti-seismic property of the steel bar is greatly improved. 本发明提供了一种双线高速棒材生产500B港标钢筋及方法，双线高速棒材采用两切分轧制，所述双线高速棒材的化学成分重量百分比为：C：0.18％～0.22％，Si：0.40％～0.70％，Mn：1.30％～1.50％，P≤0.045％，S≤0.045％，Nb：0.020％～0.030％，V：0.050％～0.080％，其余为Fe；所述双线高速棒材的轧制规格为φ10～φ20mm。本发明双线高速棒材强屈比≥1.27，塑韧性Agt≥12％，大大提高了钢筋的抗震性能。