British standard B500B twisted steel adding with micro-alloyed nitrogen and its production technique

The invention discloses a British standard B500B twisted steel adding with micro-alloyed nitrogen and its production technique. The twisted steel is prepared from, by mass percent, 0.19-0.22% of C, 0.22-0.28% of Si, 1.05-1.11% of Mn, 0.022-0.028% of V, 0.31-0.35% of Cr, not less than 0.035% of P, and not less than 0.035% of S; the allowance is Fe and inevitable impurities. The production techniqueincludes smelting, continuous casting and rolling. During the smelting process, the micro-alloyed nitrogen is added, and can replace ferrovanadium for the production of the micro-alloyed nitrogen production; the twisted steel can improve the steel intensity, flexibility, ductility and thermal fatigue resistance; thus the steel has good weldability and can reduce cost of steel per ton. The Britishstandard B500B twisted steel solves the difficulty that the production cost of the British standard B500B hot rolling belt rib twisted steel is high, and the mechanical performance is less in surplusamount; the twisted steel