Vanadium and titanium compound microalloyed steel bar and production method thereof

TLDR: In this article, a vanadium and titanium compound microalloyed steel bar and a production method for the steel bar were presented. And the performance requirements of the steel bars in 400 MPa or 500 MPa of grades are met.

Abstract: The invention discloses a vanadium and titanium compound microalloyed steel bar and a production method thereof. The steel in the steel bar comprises the following chemical components in percentage by weight: 0.16 to 0.25 percent of C, 0.20 to 0.80 percent of Si, 1.20 to 1.50 percent of Mn, 0.001 to 0.12 percent of Ti, 0.001 to 0.10 percent of V, less than or equal to 0.01 percent of N, less than or equal to 0.045 percent of S, less than or equal to 0.045 percent of P, and the balance of Fe and inevitable impurities. The production method for the steel bar comprises the following steps of: a, smelting crude molten steel, tapping, deoxidizing and alloying; b, refining, trimming the components to make the components meet the component requirement of the steel bar, and casting; and c, performing hot rolling, wherein alloying vanadium and titanium after deoxidizing in the process of tapping, or in the process of refining. According to the vanadium and titanium compound microalloyed steel bar, the yield strength and the tensile strength of the steel are improved under the condition of not changing the ductility of the steel, and the performance requirements of the steel bars in 400 MPa or 500 MPa of grades are met.