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Method for smelting weather-resistant steel in a converter using desulfurization slag and steel slag to replace part of scrap steel

A technology of converter smelting and replacing parts, which is applied in the field of converter smelting molten steel to achieve good air permeability and reduce steelmaking costs

Active Publication Date: 2015-12-23
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for smelting weathering steel in a converter using desulfurization slag and steel slag instead of part of scrap steel, mainly to solve the problem in the prior art that it is difficult to realize a large amount of effective utilization of iron in desulfurization slag and steel in steel slag during the smelting process of molten steel in the converter technical problem

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  • Method for smelting weather-resistant steel in a converter using desulfurization slag and steel slag to replace part of scrap steel

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Embodiment Construction

[0019] The present invention will be further illustrated below in conjunction with specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0020] The type of steel produced is weathering steel, and the phosphorus content in the steel is required to be 0.075-0.114%. The method for smelting weathering steel in a converter using desulfurization slag and steel slag to replace part of scrap steel disclosed by the present invention includes the following steps:

[0021] a. Converter top-bottom compound smelting is adopted, and the mass percentage of the raw material composition of the metal main material is 85-95% of molten iron, 2-15% of desulfurization slag and steel slag, and the balance is light steel scrap;

[0022] b. Add converter slagging auxiliary materials for slagging when the converter oxygen lance is energized and ignited...

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Abstract

The invention discloses a method for converter smelting of weathering steel by using desulphurization slag and steel slag to substitute a part of steel scrap. The method mainly overcomes the technical problem that considerable effective utilization of iron in desulphurization slag and steel in steel slag cannot be realized in converter molten steel smelting in the prior art. According to the invention, the range of slag components in molten weathering steel is controlled so as to control the amount of furnace slag; limestone is used as a part of a slagging material for slagging so as to alleviate splashing caused by a carbon-oxygen reaction at an early stage; desulphurization slag and steel slag are used to substitute a part of steel scrap in converter smelting of weathering steel, so the purpose of reducing smelting cost for weathering steel is achieved.

Description

technical field [0001] The invention relates to a method for smelting molten steel in a converter, in particular to a method for smelting weather-resistant steel in a converter in which part of scrap steel is replaced by desulfurization slag and steel slag. Background technique [0002] The iron content of the desulfurization slag produced during the desulfurization process of molten iron is more than 50%, and the steel content of the steel slag produced during the converter smelting molten steel is more than 60%. If the desulfurization slag and steel slag can be effectively used, it can be reduced. The cost of molten steel smelting can be reduced, and environmental pollution can be reduced. [0003] In the prior art, the utilization of desulfurization slag is mostly directly added to the molten iron in the ladle, but the temperature of the molten iron cannot fully melt the desulfurization slag iron, which limits the amount of desulfurization slag iron used in the molten iro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/30C21C5/36
Inventor 胡建光唐洪乐
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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