The invention discloses a method for producing steel for a low-
nitrogen stranded wire by use of the non-vacuum process of a converter, belonging to the technical field of steel for prestressed steel strand. The method comprises the steps of molten iron desulphurization and slagging off, converter
smelting,
slag blocking and tapping, steel
ladle deoxidization and alloying, steel
ladle slag modification, LF steel
ladle refining, Si-Ca wire feeding, steel ladle bottom soft
argon blowing, full-protection
casting of 160mm*160mm small square billet and terminal
electromagnetic stirring matched with a crystallizer; the technical parameters of control are as follows: the converter adopts double-
slag operation, the end point carbon is under 0.20-0.30% control, the tapping temperature is 1,600-1,630 DEG C, and the thickness of roughing slag is 0-50mm; a micro-
nitrogen carburant (N: 0.005-0.025%) is matched with 5kg of carbon per
ton of steel, 1.5kg of Si-Ca-Ba per
ton of steel is added for
deoxidization, and 4kg of synthetic slag per
ton of steel is added; the
oxygen activity outside the LF refining
station is controlled to be less than or equal to 10ppm, and the content of FeO and MnO in final slag is less than or equal to 3%; and 1m Ca-Si wire per ton of steel is fed, and the soft
argon blowing time is 12-30 minutes. The method disclosed by the invention remarkably lowers the production cost and reaches the
nitrogen quality control level of steel for producing a stranded wire in a vacuum degassing process.