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Method for preparing high-aluminum steel

A high-aluminum steel and molten steel technology, applied in the direction of manufacturing converters and improving process efficiency, can solve problems such as low production efficiency and yield, increased inclusions, and difficult slag control, and achieve high-efficiency mass production and production The effect of cost reduction

Inactive Publication Date: 2013-03-13
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compared with the primary smelting of the electric furnace, it is more difficult to control the slag of the primary smelting of the converter. 2 , which further aggravates the difficulty of controlling the composition of Al and Si in the production process, and will lead to Al 2 o 3 Increased inclusions reduce the pourability of molten steel
In view of the difficulty of converter continuous casting production, the electric furnace die casting process is generally used to produce high aluminum steel at home and abroad, but, in addition to the high cost, its production efficiency and yield are low
Although some manufacturers currently adopt the electric furnace continuous casting process, the number of pouring furnaces is less than 5 due to the failure to solve the above problems.

Method used

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  • Method for preparing high-aluminum steel

Examples

Experimental program
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preparation example Construction

[0034] The preparation method of the mold mold slag is well known to those skilled in the art, for example, it can be pre-melted slag or mechanically mixed slag, wherein: CaO can be derived from pre-melted slag, wollastonite, cement clinker and other CaO-containing Material; SiO 2 It can be derived from pre-melted slag, wollastonite, cement clinker, quartz sand, feldspar, etc. containing SiO 2 material; Al 2 o 3 Al can be derived from pre-melted slag, bauxite, cement clinker, lime mud, etc. 2 o 3 material; Na 2 O can come from pre-slag, Na 2 CO 3 Containing Na 2 O material; F - Can be derived from pre-slag, CaF 2 (fluorite) etc. containing F - C can be derived from C-containing materials such as carbon black, graphite, and coke.

[0035] The present invention utilizes the converter for primary smelting and strictly controls the composition of molten steel in each step, on the one hand, it ensures the content requirements of each component in the high-aluminum steel ...

Embodiment 4

[0048] The high alkalinity slag material used in embodiment 4 contains CaO, SiO 2 、Al 2 o 3 , MgO and Al, based on the total weight of the high basicity MPa, the content of CaO is 70% by weight, and the SiO 2 The content is 6% by weight, the Al 2 o 3 The content of MgO is 5% by weight, the content of MgO is 4% by weight, and the content of Al is 15% by weight (alkalinity is greater than 7, SiO 2 content≤20% by weight).

[0049] The mold flux used in Example 1-2 contains CaO, SiO 2 、Al 2 o 3 , MgO, MnO, Na 2 O, CaF 2 , C, wherein, based on the total weight of the mold powder, the content of CaO is 18% by weight, SiO 2 The content is 30% by weight, the Al 2 o 3 The content of MgO is 10% by weight, the content of MgO is 1% by weight, the content of MnO is 2% by weight, Na 2 O content is 7% by weight, CaF 2 The content of C is 7% by weight, and the content of C is 25% by weight. The basicity of the mold flux is 0.6, the melting point is 980-1020° C., and the viscosi...

Embodiment 1

[0053] This example is used to illustrate the preparation of the 38CrMoAl high-alumina steel provided by the present invention.

[0054] (1) Converter primary refining

[0055] Add 140 tons of molten iron with [C] content > 3.9% by weight in a 120-ton converter for blowing, and end the blowing after 15 minutes. The end point [C] is 0.09% by weight, and the end point temperature is 1700 ° C; Slag blocking makes FeO, CaO, SiO entering the ladle 2 The total content of , MnO and MgO is 0.5-1% by weight of the amount of molten steel entering in the ladle; when tapping reaches 40 tons (about 1 / 3 of the total weight of molten steel), add 1.5 tons of aluminum and iron earlier to carry out deoxidation and deoxidation of molten steel Preliminary alloying of aluminum, followed by adding recarburizer anthracite, ferrochromium, ferromolybdenum, ferromanganese alloy, alloying C, Cr, Mo, Mn elements, the amount of alloy added to control C, Cr, Mo, Mn within the standard requirements Near t...

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Abstract

The invention relates to a method for preparing high-aluminum steel. The method comprises the following steps of: initially smelting by using a converter and then tapping initial smelted molten steel into a steel ladle; carrying out predexidation alloying and recarburization on the molten steel so that the molten steel comprises the following components in the terms of total weight: not more than 0.0005 percent of active oxygen, 0.2-0.3 percent of Al, 0.05-0.1 percent of Si and 0.27-0.35 percent of C; adding high-basicity slag with the basicity of larger than 7 and the SiO2 content of not more than 20 percent by weight so that the SiO2 content in the molten steel top slag is not more than 8 percent by weight; carrying out first aluminum feeding on the molten steel in the steel ladle after tapping, carrying out temperature adjusting treatment on the molten steel obtained after first aluminum feeding and carrying out secondary aluminum feeding; carrying out vacuum fine smelting and alloy fine tuning on the molten steel obtained after secondary aluminum feeding; and carrying out continuous casting on the molten steel obtained after vacuum fine smelting and alloy fine tuning. The converter continuous casting disclosed by the invention can effectively realize the multifurnace continuous casting of high-aluminum steel under the condition that the molten steel is not subjected to calcium treatment, and 5 to 8 furnaces can be continuously cast.

Description

technical field [0001] The invention relates to a preparation method of high aluminum steel. Background technique [0002] With the acceleration of the transfer of the machinery manufacturing industry to China, the demand for high-aluminum steel, such as 38CrMoAl, is in a period of growth. Al in molten steel and SiO in slag exist in steel production process 2 Oxidation-reduction reactions cause the Al in molten steel to be oxidized, making it difficult to accurately control the Si and Al components in the steel. In addition, in the continuous casting production process, when the Al content in the steel is greater than 0.02% by weight, the tundish nozzle is prone to clogging, and the aluminum content of this type of high-alumina steel is more than 30 times that of ordinary steel, and the tundish nozzle is prone to clogging More serious; in addition, SiO in tundish covering agent and mold powder 2 Oxidation-reduction reactions will also occur in contact with molten steel Al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D1/00C21C5/28B22D11/111
CPCY02P10/20
Inventor 曾建华李青春张敏陈永江南红吴国荣杨森祥柯晓涛
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES