Steelmaking method for smelting high-carbon low-phosphorus steel through converter

Abstract

The invention relates to a steelmaking method for smelting high-carbon low-phosphorus steel by a converter, which comprises the following steps of: (1) in the early stage of blowing, operating at a high lance position, adding a slagging material and an iron oxide ball, and dephosphorizing at the dephosphorization rate of 70%; (2) in the middle stage of blowing, performing low-lance-position operation, adding iron oxide balls and slagging materials to prevent slag from returning dry, and entering a silicate state; (3) later stage of blowing: carrying out high-gun-position operation, adding iron oxide rubber balls, and preparing slag charge to prevent splashing; carrying out ultralow gun position operation in a carbon catching period, dephosphorizing by utilizing high oxidability and high alkalinity of slag, and starting a gun when the carbon content of molten steel is close to 0.10 wt%; and (4) a blowing process: carrying out constant-pressure variable lance operation, wherein the blowing oxygen pressure is 0.6 MPa, the oxygen blowing flow is 400 m < 3 > / min, the final temperature is 1580-1620 DEG C, and the final slag TFe is controlled to be 15-20 wt%. The method has the beneficial effects that (1) the quality of smelted steel is improved, and the production cost is reduced; splashing is not prone to occurring in the smelting process, and smelting is more stable. And (3) the end point carbon-phosphorus curve relationship is met. And (4) steel grade smelting requirements are met, and lime consumption is reduced.

Description

Technical field [0001] The present invention belongs to the field of metallurgical production, and is specifically involved in a refining method for converter high carbon low-phosphorus steel. Background technique [0002] With the continuous development of the metallurgical industry, 2020 countries have a total of 56.7% of the world, far from other countries. However, some high-end steel has a certain gap with the world's advanced steel mill, mainly due to the level of the internal quality control of the steel. The world has become more and more compact, and the competitiveness of the metallurgical industry is getting stronger. For the current state of the country, how to improve the quality of steel is the top priority of the future development of steel mills, and the control of the steel in the steel is the key. [0003] Steel clamps are mainly derived from the oxide produced by the oxodexiscoses for deoxidation. If the water-phosphorus content is reduced in stable smelting, i...

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Problems solved by technology

[0005] The object of the present invention is to provide a steelmaking method for smelting high-carbon and low-phosphorus steel in a converter, optimize the smelting process, and overcome the disadvantages of steelmaking in the existing steelmaking technology. Defects of stability, easy spattering and low carbon pull rate at the end point, improve the quality of high-carbon and low-phosphorus steel

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