The invention relates to a novel steel
wire rod and a manufacturing technique thereof. A prestressed
steel bar used as the distributed steel of tubular piles is a new product developed in recent years, and the
raw material thereof, namely, the steel
wire rod, has no special steel and production technique; the controls for the components and performances, etc. of the steel
wire rod are different, which results in larger fluctuation thus bringing the producers and the users more difficulties; therefore, the novel steel wire rod and the manufacturing technique thereof are invented. The components of the novel steel by weight percentage are: 0.28-0.34 percent of C, 0.70-1.10 percent of Si, 1.10-1.50 percent of Mn, less than or equal to 0.025 percent of S, less than or equal to 0.025 percent of P, less than or equal to 0.25 percent of Ni, less than or equal to 0.25 percent of Cr and less than or equal to 0.20 percent of Cu; the adopted technique is converter -
ladle furnace (LF) refining -
continuous casting - highline mill; in the converter process, high lance height is adjusted, returned
slag by the converter is added in the front period, and the
alkalinity is controlled in the middle and
late period; stirring is done under soft blowing before the end of the process, and then deoxidation by adopting SiAlBa is carried out; in the
ladle furnace (LF) refining process, reductive white
slag is adopted, the CaSi wires are fed and before finishing the refining, and soft
argon blowing is done; in the
continuous casting process, the degree of superheat and the
casting speed of the
molten steel are controlled and
casting is preformed under whole course protection; in the rolling process, the delayed cooling technique is adopted. The novel steel wire rod, when in use, the control range of the components is narrow, therefore, the fluctuation of adjacent batches is small; the performance of the novel steel wire rod is stable, and the aberration thereof is small.