Production method of pipeline steel

Abstract

The invention provides a production method of pipeline steel. The production method comprises following steps: molten iron in a foundry ladle is subjected to slagging treatment, to desulphurization after addition of a desulfurizer, and then to slagging treatment for a second time; the molten iron is added into a dephosphorization furnace, steel scraps and slag materials are added into the molten iron, the mixture is subjected to converting decarburization treatment so as to obtain molten steel, and then the molten steel is added into the dephosphorization furnace; slag materials are added into the molten steel in the dephosphorization furnace, the mixture is subjected to converting decarburization treatment so as to obtain decarburized molten steel; the decarburized molten steel is subjected to steel tapping treatment, and the molten steel is added into a steel ladle; the molten steel in the steel ladle is subjected to RH refining; and then the refined molten steel is subjected to teeming treatment by using a continuous caster. According to the production method of pipeline steel, ' three removal' pre-treatment technologies on full molten iron are employed, secondary refining desulphurization is not needed, low-sulfur molten steel with S less than 0.006% can be producted by raw material controlling and converter operation, production cost is low, and cleanliness of products is high.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a production method of pipeline steel. Background technique [0002] With the development and progress of society, the market's requirements for steel cleanliness and cost are increasing. High cleanliness and low cost are the main technical directions for the quality development of steel products in the 21st century. In order to improve various properties of steel, prolong service life, and increase strength, the impurity content (N, O, H) and total inclusions of steel are required The lower the better, and in order to improve the competitiveness of enterprises, the lower the cost of steel is required, the better. [0003] The traditional pipeline steel production process is the process of desulfurization pretreatment of full amount of molten iron→conventional converter smelting→LF refining outside the furnace (+RH). And the task of removing C, the efficiency is low, and th...

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Problems solved by technology

[0003] The traditional pipeline steel production process is the process of desulfurization pretreatment of full amount of molten iron→conventional converter smelting→LF refining outside the furnace (+RH). And the task of removing C, the efficiency is low, and the quality of molten steel is likely to be unstable due to the fluctuation of the production process. The main purpose of refining and purifying molten steel outside the LF furnace is to raise the temperature, remove S and alloy, but the LF refining outside the furnace is easy The increase of N in molten steel is serious, and the purity of molten steel is reduced; and the traditional pipeline steel production process has high energy consumption, high cost, and CO 2 high emissions

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