Method for producing high carbon steel by high-catching carbon method

Abstract

The invention provides a method for producing high-carbon steel by a high-carbon-withdrawal method, in particular to a smelting process of high-carbon-withdrawal tapping when a converter adopts a single slag process to produce high-carbon steel. The process comprises the following steps of: (1) putting molten iron and scrap steel into the converter according to the requirements on tapping temperature and a certain hot metal ratio; (2) air refining with the oxygen supply strength of 3.1 to 3.4Nm<3> / min / t in the converter; (3) adding active lime and an ore slagging element into the converter; (4) adopting an oxygen supply system of different lance positions under constant flow, adopting rather high lance positions in the whole course of air refining of the converter, and adopting a lance position system in which lance positions get lower piecewise from the beginning to the end of air refining; (5) adding ore and fluorite in small amount by a plurality of batches when the total air refining oxygen consumption is within 70 percent to 85 percent; (6) finishing the air refining of the converter, deslagging by turning down the converter, temperature measurement and sampling; and (7) converter tapping. The smelting process has advantages of short time of air refining of the converter and active slag, and can meet the dephosphorization effect under the high-carbon-withdrawal condition of molten steel, and realize the high-carbon-withdrawal tapping.

Description

technical field [0001] The invention relates to a smelting method of high-carbon steel, in particular to a smelting method for high-drawing carbon tapping when a converter adopts a single slag method to produce high-carbon steel. Background technique [0002] There are two ways to smelt high-carbon steel in converters according to the carbon content of molten steel when tapping: one is the high-drawing carbon method, and the other is the low-drawing carbon method. Compared with the low-drawing carbon tapping method, the high-drawing carbon tapping method has the following advantages: short blowing time, less oxygen consumption, less blowing loss of iron, high metal yield; less erosion of slag to the furnace lining, prolonging the furnace life ; Small amount of carbon added, less amount of carbon powder added; low oxygen content in steel, less alloy consumption, less original inclusions; low content of nitrogen, hydrogen and other gases in steel; less fluctuations in steel co...

AI Technical Summary

Problems solved by technology

The molten pool material level is 13-15% lower than the conventional one, which will reduce the amount of loading and tapping, and reduce production efficiency; the content of FeO in the slag is low, <10%, which is not conducive to slag melting, and fluorite is used to force slag melting. This will increase the erosion of fluorite on the furnace lining, which is not conducive to the improvement of furnace life; the slagging method of lime and fluorite will cause large blowing losses of iron in the metal, and the metal yield will be low; there is no clear oxygen pressure for blowing in the literature and oxygen intensity

This process is also not suitable for modern converters to smelt high carbon steel