Method for controlling impurities in high-carbon steel

Abstract

The invention discloses a method for controlling impurities in high-carbon steel. The method comprises converter smelting, steel tapping control, top slag control, white slag manufacturing by refining, and continuous casting, wherein the method specifically comprises the following steps: step one, converter smelting: adding dust pressure blocks which are from steel enterprises and have iron content being not less than 50% at the early stage of smelting; quickly removing phosphor and controlling the smelting so that the phosphor content is not more than 0.008%; step two, slag tapping control; step three, top slag control; step four, white slag manufacturing by refining: controlling the content of (Al2O3) in the refined white slag and feeding steel ladles to a calcium-containing alloy core-spun yarn, so that the impurities are formed into plastic impurities with a low melting point; and a step five, continuous casting: producing the high-carbon steel continuous casting billet by a continuous casting process. The pure (Al2O3) in the crisp impurities of the high-carbon steel produced by the method are remarkably reduced; and the impurities in the steel mainly are 7Al2O3.12CaO plastic impurities which are silicate and sulphide impurities. The impurities in the steel are plastic composite impurities, and so the method has a remarkable effect of reducing brittle failure of the high-carbon steel in a cold-rolling process.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgical production, in particular to a method for controlling inclusions in high-carbon steel production. Background technique [0002] High-carbon steel is a steel type with a carbon content of C≥0.6%. It is widely used in the metal products industry, especially in the wire industry. Steel cords, cut-off wires, rubber hose wires, bead wires, and oil drilling Steel wire rope, etc., with a minimum diameter of 0.08mm, have very high requirements on the purity of steel, strict control on the removal of impurity elements, and very high requirements on the control of non-metallic inclusions in steel. [0003] At present, some technologies for controlling and removing non-metallic impurities in steel mainly include: [0004] A method for controlling non-metallic inclusions in alloy structural steel, the main purpose of which is to improve the composition and size of non-metallic inclusions in steel ...

AI Technical Summary

Problems solved by technology

Therefore, when iron and steel metallurgical enterprises produce high-carbon steel with very high quality requirements, they use technological methods such as molten iron pretreatment, converter and electric furnace smelting, refining white slag, and vacuum treatment to minimize non-metallic inclusions in steel, and the production process is complicated. ,high cost