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Method for manufacturing compound core low-segregation large-sized hollow steel ingot

A manufacturing method and composite core technology, applied in the manufacture of tools, equipment for feeding molten metal into molds, molds, etc., can solve problems such as segregation of large hollow steel ingots, difficulty in controlling internal quality, and excessive flaw detection of forgings. The effects of sequential solidification, improving utilization and scope of use, and reducing segregation

Inactive Publication Date: 2008-10-08
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 manufacturing a large hollow steel ingot with a composite core and low segregation, which solves the problem of segregation in the manufacturing process of a large hollow steel ingot, and the casting of molten steel in the atmosphere is prone to secondary oxidation, the internal quality is difficult to control, and the flaw detection of forgings is easy. There are problems such as exceeding the standard defects

Method used

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  • Method for manufacturing compound core low-segregation large-sized hollow steel ingot
  • Method for manufacturing compound core low-segregation large-sized hollow steel ingot
  • Method for manufacturing compound core low-segregation large-sized hollow steel ingot

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Embodiment 1

[0055] The material of this embodiment is No. 25 steel, the weight of pouring molten metal is 45 tons, and the pouring speed is 9 tons per minute.

[0056] The implementation of the present invention is as follows: the process design is carried out by adopting the design technology of the smooth filling pouring system, advanced computer simulation technology, etc., mainly using the composite core hole forming technology, the large temperature difference cooling technology, the narrow gap molding sand technology, and the scattered pouring Port drainage technology, thick and large chassis forced cooling technology, liquid nitrogen ejector device, etc. The specific process is as follows:

[0057] 1) The composite core is composed of three layers of steel plates and one layer of molding sand. The outer layer of steel plates (outer core tube) is 15mm thick, the middle layer of steel plates (middle core tube) is 15mm thick, and the inner layer of steel plates (inner core tube) is 15...

Embodiment 2

[0064] The material of this embodiment is No. 25 steel, the weight of poured molten metal is 55 tons, and the pouring speed is 10 tons per minute.

[0065] The implementation of the present invention is as follows: the process design is carried out by adopting the design technology of the smooth filling pouring system, advanced computer simulation technology, etc., mainly using the composite core hole forming technology, the large temperature difference cooling technology, the narrow gap molding sand technology, and the scattered pouring Port drainage technology, thick and large chassis forced cooling technology, liquid nitrogen ejector device, etc. The specific process is as follows:

[0066] 1) The composite core is composed of three layers of steel plates and one layer of molding sand. The outer layer of steel plates is 25mm thick, the middle layer of steel plates is 25mm thick, and the inner layer of steel plates is 25mm thick. The gap between the outer steel plate and th...

Embodiment 3

[0072] The material of this embodiment is No. 25 steel, the weight of poured molten metal is 40 tons, the pouring speed is 8 tons per minute, and the material is No. 25 steel.

[0073] The implementation of the present invention is as follows: Still using the smooth filling pouring system design technology, advanced computer simulation technology, etc. to carry out process design, mainly using composite core hole forming technology, large temperature difference cooling technology, narrow gap molding sand technology, and betting dispersion Gate drainage technology, thick and large chassis forced cooling technology, liquid nitrogen ejector device, etc. The specific process is as follows:

[0074] 1) The composite core is composed of three layers of steel plates and one layer of molding sand. The outer layer of steel plates is 5mm thick, the middle layer of steel plates is 5mm thick, and the inner layer of steel plates is 5mm thick. The gap between the outer steel plate and the ...

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Abstract

The invention relates to a casting process of all levels of large-scale hollow ingots below 250-ton level, in particular to a manufacturing method of composite core low-segregation large-scale hollow ingots. The manufacturing method is applicable to the preparation process of all large-scale hollow ingots which adopt the composite core pouring, comprising the casting of the hollow ingots with various shapes, specifications and materials. In addition to the usage of the computer simulation means to reasonably design an ingot mold and a pouring system, the invention mainly adopts the composite core hole forming technology, the large temperature difference cooling technology, the narrow gap molding sand technology, the bottom pouring dispersible gate drainage technology, the thick and large chassis mandatory cooling technology and a liquid nitrogen ejector device etc., and the invention further designs the corresponding mold and the equipment, pours the steel water with the different materials and prepares the low-segregation hollow ingots. The invention can ensure the serial solidification of the hollow ingots, reduce the defects of shrinkage, loose and inclusion, control the segregation position, lead the segregation band of the hollow ingots to be positioned at the middle position and improve the utilization rate and the using range of the hollow ingots.

Description

technical field [0001] The invention relates to the casting process of large hollow steel ingots of all grades below 250 tons, in particular to a manufacturing method of composite core low segregation large hollow steel ingots. It is suitable for all preparation processes of casting large hollow steel ingots with composite cores, including the casting of hollow steel ingots of various shapes, specifications and materials. Background technique [0002] In recent years, the energy and petrochemical industries have developed rapidly, and the scale of the industry has continued to expand. Objectively, relevant enterprises are required to carry out large-scale equipment transformation and main equipment renewal. In particular, the demand for large cylindrical parts has increased, such as large hydrogenation reactors, nuclear power main pipelines, and hydraulic turbine shafts. In the past, since only a few countries mastered the hollow steel ingot manufacturing technology and cyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/04B22C9/10B22D27/04B22D35/04
Inventor 李殿中康秀红夏立军傅排先李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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