PROCESS FOR SMELTING STEEL FOR ULTRAFINE CARBORUNDUM WIRE

摘要

A process for smelting steel for an ultrafine carborundum wire, comprising: 1) in a vacuum induction furnace, using pure iron and low-phosphorus pig iron as raw materials to be melted into molten steel under the protection of argon; vacuumizing and smelting, and degassing for 15-20 min under 300 Pa; using high-purity silicon iron as a deoxidizer to adjust components of the molten steel; and casting a circular ingot in vacuum; 2) cleaning the surface of the circular ingot to manufacture an electrode bar for electroslag smelting; 3) using the electrode bar as a raw material for remelting and smelting in an electroslag furnace, electroslag protecting slag comprising: CaF2: 45-55%, Al2O3: 15-25%, SiO2: 20-25%, Na2O: 2-4%, and K2O: 1-2%; and smelting the electrode bar in the electroslag furnace into a cylindrical electroslag ingot, the diameter of the electroslag ingot being 0.4-0.5 m; 4) forging the electroslag ingot as a square billet for wire rolling; and 5) rolling the forged billet as a steel wire rod having the diameter of 4.5-5.5 mm, the steel wire rod comprising [C]: 0.92-1.1%, [Si]: 0.3-0.4%, [Mn]: 0.5-0.8%, [Al]<0.0008%, [N]<0.005%, [S]<0.01%, and [P]<0.015%.