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Method for casting large steel ingot with built-in cold core and overhead electromagnetic field

An electromagnetic field and cold core technology, applied in the field of steel ingot casting, can solve the problems of severe segregation and coarse structure in the center of the steel ingot, and achieve the effects of improving solidification quality, reducing production costs, and reducing costs

Active Publication Date: 2017-04-19
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for large steel ingots, even if the feeding is smooth, it is still difficult to effectively control the central quality defects such as coarse structure and serious segregation in the center of the steel ingot

Method used

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  • Method for casting large steel ingot with built-in cold core and overhead electromagnetic field
  • Method for casting large steel ingot with built-in cold core and overhead electromagnetic field
  • Method for casting large steel ingot with built-in cold core and overhead electromagnetic field

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as Figure 1-Figure 3 As shown, the upper cast 12 angle 39t solid 4Cr13 steel ingot, the specific steps are as follows:

[0037] Preparation of cold core: firstly, cold core 10 is prepared in the whole mold process. The raw material selection standard of cold core 10 is: the composition is similar to that of 4Cr13, and the content of C, Si, Mn, P, and S elements is slightly lower than that of molten steel. There are no defects such as porosity, shrinkage cavity, inclusion and gas inside the cold core. The cold core 10 is polished to remove the oxide layer and dirt. The cross-sectional shape of the cold core 10 is circular. The diameter of the lower opening of the steel ingot 9 is 1340mm. The core 10 is uniformly preheated to 250° C., and the temperature of the cold core 10 is not lower than 150° C. during pouring and filling, and it is firmly seated on the bottom of the steel ingot mold 8 . Also can cold core 10 be fixed on steel ingot 9 center by fixing bar 12, ...

Embodiment 2

[0043] Such as Figure 1-Figure 3 As shown, the 12-angle 28t solid composite steel ingot is cast down, and the specific steps are as follows:

[0044] Preparing the cold core: Firstly, the cold core 10 is prepared during the whole molding process. The raw material selection method of the cold core 10 is as follows: the stainless steel cold core 10 is selected, and there are no defects such as porosity, shrinkage cavity, inclusion and gas inside. The cold core 10 is polished to remove oxide layers and dirt. The cross-sectional shape of the cold core 10 is circular. The diameter of the lower opening of the steel ingot 9 is 1150mm. The core 10 is evenly preheated to 250°C, and the temperature of the cold core 10 is not lower than 150°C during pouring and filling, and the cold core 10 is fixed to the center of the steel ingot 9 through the fixing rod 12, and the bottom of the cold core 10 can be connected with the steel ingot 9 ingot body The plane distance of the lower mouth is ...

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Abstract

The invention discloses a method for casting a large-scale steel ingot with a built-in cold core and an overhead electromagnetic field, which can cast a large-scale steel ingot with high yield and few central defects. The steps of the invention include: cold core preparation; cold core preheating; built-in cold core; air exhaust; steel ingot filling; top electromagnetic field; demoulding and cooling. The built-in cold core of the invention can effectively control the center defects of steel ingots, such as coarse crystal structure, center segregation, looseness, etc.; the top electromagnetic field can heat and stir the cap mouth liquid steel, which can effectively reduce the cap volume ratio of steel ingots and the cutting rate of pressure processing , promote solidification feeding and disperse element segregation of steel ingots, reduce thermal processing of steel ingots and improve the qualified rate of ultrasonic flaw detection of products. The invention is applicable to the casting of solid steel ingots and solid composite steel ingots of various specifications, materials and shapes.

Description

technical field [0001] The invention relates to a steel ingot casting method, in particular to a method for casting a large steel ingot with a built-in cold core and an overhead electromagnetic field. Background technique [0002] In recent years, with the rapid development of important fields such as metallurgical equipment, shipbuilding, electric power, nuclear energy, national defense and military industry, high-rise buildings, petrochemicals, and heavy machinery, the demand for large castings and forgings has increased significantly, and their quality requirements have become increasingly stringent. It is also required to have high Z-direction performance and flaw detection pass rate. Porosity and shrinkage cavities will inevitably occur during the solidification process of traditional die-cast steel ingots, and the larger the steel ingot and the higher the aspect ratio, the more prominent the central defect. For this reason, in order to ensure the forging quality of st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/04B22D27/02
CPCB22D27/02B22D27/04
Inventor 许长军胡小东张雪健胡林
Owner UNIV OF SCI & TECH LIAONING
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