Steel making method of convertor with small slag quantity

Abstract

The invention relates to a steel making method of a convertor with small slag quantity. The method is carried out according to the following steps of: (a) after putting into a furnace and tapping, retaining more than 80 percent of slag; (b) tilting the furnace, adding steel scraps, blending molten iron and straightening a furnace body in a shaking way; (c) descending a gun, supplying oxygen and starting converting; (d) when the silicon-manganese oxidation is finished, ascending the gun and deslagging; (e) charging according to 48 to 54 percent of the total addition amount of a common slag charge, slagging and converting continuously; (f) when the converting reaches a final component range, stopping supplying the oxygen, turning down the furnace, sampling, measuring the temperature and analyzing the carbon content, the sulfur content and the phosphorus content quickly; (g) when the components and the temperature conform to the specified requirements, turning down the furnace and tapping; and (h) carrying out deoxidated alloying treatment during tapping, retaining 80 to 100 percent of slag quantity simultaneously and preparing the converting of steel in the next batch. The inventionrealizes the reduction of the use quantity of lime and the production cost by changing a traditional steel making and slagging process under the conditions that equipment is not increased, the cost of the raw materials is not increased and the operation difficulty is not increased.

Description

technical field [0001] The invention relates to a converter steelmaking process, in particular to a small slag amount converter steelmaking method. Background technique [0002] The converter steelmaking method, which uses pure oxygen to blow molten iron from the top of the converter to form steel, has been rapidly promoted around the world since it was put into industrial production in the early 1950s, and has gradually replaced the air converter method and the hearth furnace steelmaking method. One of the main methods of modern steelmaking. The main difference between the converter steelmaking method and other steelmaking methods is that there is no external heating source, and only rely on the oxygen blown into the molten pool and the heat generated by the oxidation of various elements in the molten iron to complete the task of decarburization and removal of impurities, and heat the molten pool Liquid metal (from iron to steel), so that the molten steel reaches the speci...

AI Technical Summary

Problems solved by technology

The lime consumption can be reduced to 20Kg / T in the steelmaking process of the "double-connection method" of the converter, but the equipment consumption of this process is large and the production cost is high