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Method for effectively eliminating central defect of solidification blank and refining solidification structure

A technology of solidification structure and central defect, which is applied in the field of effectively eliminating the central defect of solidified billet and refining the solidification structure, achieving the effects of high safety, improving product qualification rate and segregation suppression

Active Publication Date: 2013-04-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for effectively eliminating the center defects of solidified blanks and refining the solidified structure, so as to solve the problems of loose shrinkage holes in steel ingots, castings and slabs in the factory and improve the solidified structure

Method used

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  • Method for effectively eliminating central defect of solidification blank and refining solidification structure
  • Method for effectively eliminating central defect of solidification blank and refining solidification structure
  • Method for effectively eliminating central defect of solidification blank and refining solidification structure

Examples

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Effect test

Embodiment 1

[0050] Pouring 1 ton of sand-cast steel ingot, the steel ingot material is 35CrMo, after the mold assembly tooling is completed, place an oscillating device on the upper end of the riser. The oscillation device adopts the gas oscillation method, and its structure design is as follows: figure 1 shown. The frequency of the oscillating device is 20 Hz, and the amplitude of the oscillating device is 10 mm; in this embodiment, the pressure of the compressed air in the oscillating device is 1 MPa. Conical refractory materials are used, and the specific dimensions are: the diameter of the upper end is Φ100, and the length is 130mm. The refractory material is heated to 750°C before being immersed in the molten metal. After the ingot is poured, an oscillating device is added to the riser of the ingot, and the refractory material is placed at 1 / 2 of the diameter of the riser; In the process of oscillation, the depth of the refractory material in the molten metal is 20mm. The refracto...

Embodiment 2

[0052] Pouring 20 tons of die-cast steel ingot, the material of the steel ingot is 20SiMn, after the mold assembly tooling is completed, an oscillation device is placed on the upper end of the riser. The oscillation device adopts the gas oscillation method, and its structure design is as follows: figure 1 shown. The frequency of the oscillating device is 30 Hz, and the amplitude of the oscillating device is 20 mm. In this embodiment, the pressure of the compressed air in the oscillation device is 4MPa. The circular refractory material is used, and the specific dimensions are: diameter Φ300, length 250mm. The refractory material is heated to 890°C before being immersed in the molten metal. After the ingot is poured, an oscillating device is added to the riser of the ingot, and the refractory material is placed at 1 / 2 of the diameter of the riser; In the process of oscillation, the depth of the refractory material in the molten metal is 50mm. The refractory material adopts h...

Embodiment 3

[0054] Casting 30 tons of continuous casting billets with a size of 600×1000×7000mm and a material of 40Cr2. After the mold assembly tooling is completed, an oscillating device is placed on the upper end of the crystallizer. The oscillation device adopts the gas oscillation method, and its structure design is as follows: figure 1 shown. The frequency of the oscillating device is 50 Hz, and the amplitude of the oscillating device is 30 mm. In this embodiment, the pressure of the compressed air in the oscillation device is 5 MPa. Square refractory material is used, and the specific size is: 300×350mm. The refractory material is heated to 900°C before being immersed in the molten metal. During the pouring process of the molten metal, an oscillating device is added to the crystallizer, and the refractory material is placed at 1 / 3 of the crystallizer; In the molten metal, the depth of the refractory in the molten metal is 60mm during the oscillation process. The refractory mate...

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Abstract

The invention discloses a method for effectively eliminating the central defect of a solidification blank and refining a solidification structure. The method relates to preparation of various castings with dead heads, round continuous casting blanks with the diameter of between phi 100 and phi 2,000 millimeters, square continuous casting blanks with the thickness of between 100 and 1,500 millimeters, 5-700-ton mould casting steel ingots, casting blanks and hollow blanks, is applied to preparation of carbon steel, alloy steel and non-ferrous metal under conditions of vacuum and non vacuum, andhas an inhibitory action on cavity shrinkage and loosen of various casting which are provided with the dead heads and made of black alloy material, the steel ingots and casting blanks. For the steel ingot and the casting, a vibration device is arranged in a steel ingot dead head after completion of pouring, and for the continuous casting blank, the vibration device is arranged in a crystallizer during pouring; the vibration device is connected with a refractory material; the refractory material is immersed in metal liquid and used for vibrating the metal liquid to increase the number of primary crystallization of the metal liquid; and a crystal nucleus is triggered to fall under the action of vibration to increase nucleation particles inside the steel ingot, eliminate cavity shrinkage andloosen inside the steel ingot, the casting and the casting blanks and refine the solidification structure.

Description

technical field [0001] The present invention is a method for effectively eliminating the central defects of solidified blanks and refining the solidified structure, involving all castings with riser design, continuous casting round blanks with a diameter of Φ100-Φ2000mm, continuous casting square blanks with a thickness of 100-1500mm and Preparation of die-casting steel ingots, billets and hollow billets of 5 tons to 700 tons, used in the preparation of carbon steel, alloy steel and non-ferrous metals under vacuum and non-vacuum conditions, and castings with riser design for various ferrous alloy materials The shrinkage porosity of steel ingots and billets can be inhibited, and the grain refinement can be promoted. Background technique [0002] In recent years, with the rapid development of my country's electric power industry, nuclear industry and petrochemical industry, the demand for large castings, large steel ingots, and large billets is increasing, and the quality requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D7/12B22D11/114
Inventor 李殿中傅排先刘宏伟夏立军栾义坤李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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