| Abstract Scope |
By optimizing the steel composition design of oil drilling casing, the steelmaking process of "BOF → LF → VD → CC" is adopted. The composition control range of LF refining slag system: CaO 50-55%, Al2O3 26-31%, SiO2 ≤ 9%, MgO ≤ 6%, (TFe+MnO) ≤ 0.5%; The constant pulling speed of 450mm section continuous casting billet is 0.42 m/min, the stirring current is controlled at 150-300A, the stirring frequency is 2.0-8.0HZ, the superheat of the continuous casting ladle is controlled at 20-30 ℃, and the surface temperature of the billet when it exits the pit is ≤ 180 ℃. The excellent corrosion resistance and wear resistance of petroleum drilling casing steel improve the service life of the product. |