Method for producing high carbon steel through double-slag high drawing carbon tapping

Abstract

A method for producing high carbon steel through double-slag high drawing carbon tapping belongs to the technical field of smelting high carbon steel through a converter. The method comprises processing steps as follows: molten iron and steel scraps are loaded in the converter according to a certain molten iron ratio; in a first stage of converter steelmaking, the converting is performed at the oxygen supplying intensity of 2.8 Nm<3> / min / t, active lime and ore fluxing mediums are added in the converter, and a larger bottom blown flow rate is adopted to stir; the converting is performed at a standard lance height in the prior period for the converting of the converter, and then the lance height rises gradually; part of furnace slag is dumped through a rocking furnace; in the second stage for the converting of the converter, the converting is performed at the oxygen supplying intensity of 3.3 Nm<3> / min / t, and active lime and the ore fluxing mediums are added in the converter; the lance height rule that the converting is performed at a higher lance height in the later period and the lance height descends stage by stage is adopted; a small quantity of ores and fluorites are added frequently within 80 to 90 percent of total converting oxygen consumption; after the converting of the converter is finished, deslagging is performed through the rocking furnace of the converter, and temperature measurement and sampling are carried out; and converter tapping is carried out. The method has the advantage of overcoming the shortages of serious rephosphoration caused during the tapping process, low production efficiency, and so on.

Description

technical field [0001] The invention belongs to the technical field of converter smelting high-carbon steel, in particular to a method for producing high-carbon steel by double-slag high-drawing carbon tapping. 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. The high-drawing carbon method has short tapping and blowing time, less oxygen consumption, less iron blowing loss, and high metal yield; the carbon content of tapping is high, and the total iron content of slag is low, which can reduce the erosion of slag on the furnace lining and increase the furnace life; When tapping, the carbon content is high, and the oxygen activity of molten steel is low, which can increase the alloy yield; high-drawing carbon tapping can reduce the amount of carburizing agent, which not only saves the cost, ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for producing high-carbon steel by double-slag high-drawing carbon tapping, which overcomes the shortcomings of the above-mentioned tapping process, such as relatively serious phosphorus return and low production efficiency.