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Method for solving problem of copper segregation in steel

A technology for molten steel and molten steel, applied in the field of improving the quality of steel, can solve problems such as hazards, and achieve the effects of expanding sources, improving quality, and achieving significant economic benefits

Active Publication Date: 2013-05-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing technologies are all based on reducing the copper content in steel or raw materials (scrap steel) to solve the harm caused by copper segregation in steel to the quality of steel products, so the problem of copper segregation in steel cannot be fundamentally solved

Method used

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  • Method for solving problem of copper segregation in steel
  • Method for solving problem of copper segregation in steel
  • Method for solving problem of copper segregation in steel

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The main harm of copper to steel is that copper is easy to segregate at grain boundaries, which leads to hot brittleness of steel at high temperature. Therefore, if conditions can be created so that copper can be dispersed and precipitated finely in the steel without segregation at the grain boundary, the harm of copper to the steel can be eliminated, and even the harm can be turned into a benefit, which can improve some properties of the steel.

[0031]In this embodiment, low carbon steel is smelted in a 260-ton top-blown converter. The steel smelting process is as follows: after the converter is blown, 52.0 kg of aluminum is firstly added after tapping to carry out pre-deoxidation and alloying treatment of molten steel. Add 83.8kg of recarburizer, 563.0kg of ferrosilicon and 209.0kg of ferroniobium to carry out deoxidation and alloying of molten steel, and then the molten steel enters the LF furnace for refining treatment. After the molten steel is processed, FeS24.3k...

Embodiment 2

[0037] The difference between this embodiment and Embodiment 1 is that the smelted steel is medium carbon steel. After the converter blowing is completed, 78.0kg of aluminum is added for pre-deoxidation and alloying treatment after the molten steel is tapped. After tapping, 1230.7kg of recarburizer and 1343.3kg of ferrosilicon were added to deoxidize and alloy the molten steel. Then the molten steel enters the LF furnace for refining treatment. After the molten steel is processed, FeS37.26kg and ferromanganese 3652.1kg are added to the steel respectively. Then, the oxygen activity in the steel was measured by a fixed oxygen probe. When the oxygen activity of the molten steel was controlled at 0.0200%, 393.9 kg of iron zirconium was used for the final deoxidation of the molten steel. After the addition of zirconium iron, the molten steel was sedated for 300s. The composition of this steel is shown in Table 2.

[0038] Table 2 Experimental steel composition (wt%) of Example ...

Embodiment 3

[0042] The difference between this embodiment and Embodiment 1 is that the manganese and sulfur contents in the steel are increased. After the converter blowing, firstly add 34.8kg of aluminum during tapping to carry out pre-deoxidation and alloying treatment of molten steel. change. Then add FeS112.7kg and ferromanganese 4154.6kg to the steel at the same time, and then the molten steel enters the LF refining furnace for processing. After the molten steel is treated, the oxygen activity in the steel is measured by a fixed oxygen probe. When the oxygen activity of the molten steel is controlled at 0.0250%, 299.4 kg of zirconium iron is used for final deoxidation. The molten steel was sedated for 350s after the addition of zirconium iron. The composition of this steel is shown in Table 3.

[0043] Table 3 Experimental steel composition (wt%) of Example 3

[0044]

[0045] No obvious segregation of copper at grain boundaries was found in the samples of the experimental ste...

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Abstract

The invention discloses a method for solving a problem of copper segregation in steel. The method comprises steps of: smelting in a converter or electric furnace; deoxidizing and alloying molten steel; refining; and performing continuous casting or die casting. The method is characterized by comprising the following steps of: 1) after tapping of the converter, adding aluminium into the steel for preliminary deoxidation and alloying; (2) adding a carburant, ferrosilicon or ferrocolumbium or a mixture of the ferrosilicon and the ferrocolumbium for molten steel deoxidation and alloying; 3) adding FeS and manganese or refining and adding FeS and manganese; and 4) refining, and finally adding ferrozirconium for final deoxidation. The method is suitable for steel with 0.05 to 0.5 percent of carbon. Through the method, the quality of the steel is improved, and the steel is subjected to fine and disperse precipitation, and does not have obvious segregation in crystal boundaries.

Description

technical field [0001] The invention relates to a method for improving the quality of steel, in particular to a method for solving copper segregation in steel. Background technique [0002] Copper is a harmful element for most steel grades, and its main hazard is that copper is easy to segregate at the grain boundaries during the cooling of the steel and the rolling and reheating of the cast billet during the steelmaking production process, causing the steel to be hot and brittle at high temperatures. [0003] In recent years, with the continuous development of steelmaking technology and the requirement to reduce the cost of steelmaking, the scrap ratio of raw materials used in the steelmaking process has been continuously increased, especially for electric furnace steelmaking, scrap steel is the main raw material. As the main residual element of scrap steel, copper will be brought into the steel in a large amount during the use of scrap steel, no matter which steelmaking me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/06
Inventor 吕春风尚德礼李德刚廖相巍于广文康磊
Owner ANGANG STEEL CO LTD
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