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Method for solving problem of copper segregation in steel

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

Active Publication Date: 2011-06-22
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 the grain boundary, which leads to hot embrittlement of steel at high temperature. Therefore, if conditions can be created to make copper finely disperse and precipitate in steel without segregation at grain boundaries, the harm of copper to steel can be eliminated, and even harm can be turned into benefit, which can improve some properties of steel.

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

Embodiment 2

[0037] The difference between this embodiment and embodiment 1 is that the smelted steel is medium carbon steel. After converter blowing is completed, 78.0kg of aluminum is added after molten steel is tapped for pre-deoxidation and alloying treatment. After tapping, 1230.7kg of recarburizer and 1343.3kg of ferrosilicon are added respectively for deoxidation and alloying of molten steel. The molten steel then enters the LF furnace for refining treatment. After the molten steel has been treated, 37.26kg of FeS and 3652.1kg of ferromanganese are added to the steel respectively. Then, the oxygen activity in the steel is measured by a fixed oxygen probe, and when the oxygen activity of the molten steel is controlled at 0.0200%, 393.9 kg of iron zirconium is used for the final deoxidation of the molten steel. After ferro-zirconium is added, the molten steel is calmed for 300s. The composition of this steel is shown in Table 2.

[0038] The experimental steel composition (wt%) of...

Embodiment 3

[0042] The difference between this embodiment and embodiment 1 is that the content of manganese and sulfur in the steel is increased. After converter blowing, 34.8kg of aluminum is firstly added to the molten steel for pre-deoxidation and alloying treatment when tapping the 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 treatment. After the molten steel has been treated, the oxygen activity in the steel is measured with an oxygen-fixing probe. When the oxygen activity of the molten steel is controlled at 0.0250%, 299.4kg of iron zirconium is used for final deoxidation. After ferro-zirconium is added, the molten steel is calmed for 350s. The composition of this steel is shown in Table 3.

[0043] The experimental steel composition (wt%) of table 3 embodiment 3

[0044]

[0045] In the sample of the experimental steel smelted by the method of Example 3, no obvious c...

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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 steel quality, in particular to a method for solving copper segregation in steel. Background technique [0002] Copper is a harmful element for most steel types. Its main hazard is that copper is easy to segregate at grain boundaries during steel cooling and rolling and reheating of cast slabs in the steelmaking process, which leads to hot embrittlement of steel 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 continued to increase, especially for electric furnace steelmaking, scrap steel is its main raw material. As copper is the main residual element of steel scrap, no matter which steelmaking method is adopted, a large amount of copper will be brought into steel during the use of scrap steel, which seriously threatens the qu...

Claims

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Application Information

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Patent Type & Authority Applications(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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