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Process for manufacturing low-aliquation large-scale hollow steel ingot

A manufacturing method and hollow steel technology, which are used in the manufacture of tools, equipment for feeding molten metal into casting molds, casting molds, etc., can solve the problems of difficult core removal and inner core deformation, and reduce secondary oxidation inclusions. , The effect of reducing shrinkage and ensuring operability

Inactive Publication Date: 2008-10-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for manufacturing a large hollow steel ingot with low segregation, so that the core is not easy to take out and the deformation of the inner core body is solved during the production process of the large hollow steel ingot, and at the same time the problem of segregation of the large hollow steel ingot is alleviated, so that the hollow steel ingot Segregation location under control

Method used

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  • Process for manufacturing low-aliquation large-scale hollow steel ingot
  • Process for manufacturing low-aliquation large-scale hollow steel ingot
  • Process for manufacturing low-aliquation large-scale hollow steel ingot

Examples

Experimental program
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Effect test

Embodiment 1

[0045] like figure 1 As shown, the weight of poured molten metal is 40 tons, the pouring speed is 5 tons / minute, and the material is No. 25 steel.

[0046] The implementation of the present invention is as follows: the process design is carried out by adopting the gas protection technology of the metal liquid surface, the design technology of the smooth filling and pouring system, and the advanced computer simulation technology, and mainly adopts the large air volume cooling technology and the steel structure nested core hole forming technology , Metal liquid early covering technology, gas protection flow injection technology, etc.

[0047] The advanced computer simulation technology ensures the rationality of the process design. The steel structure nested core hole forming technology and the large air volume cooling technology are used to complete the sequential solidification of the steel ingot and control the segregation position.

[0048] In this embodiment, the outer ste...

Embodiment 2

[0056] like figure 1 As shown, the weight of poured molten metal is 43 tons, the pouring speed is 7 tons per minute, and the material is No. 25 steel.

[0057] The implementation of the present invention is as follows: the process design is still carried out by adopting the metal liquid surface gas protection technology, the design technology of the smooth filling and pouring system, and the advanced computer simulation technology, mainly adopting the large air volume cooling technology, the steel structure nested core forming Hole technology, metal liquid early covering technology, gas protection injection technology, etc.

[0058] In this embodiment, the outer steel plate is 25 mm thick, the inner steel plate is 25 mm thick, the gap between the two steel plates is 60 mm, and the steel plates are supported by steel pipes. 50mm.

[0059] In this embodiment, the pressure of compressed air is 0.8MPa, and the gas flow rate is 400m 3 / min, the ventilation time is 5h.

[0060]...

Embodiment 3

[0062] like figure 1 As shown, the weight of poured molten metal is 45 tons, the pouring speed is 6 tons per minute, and the material is No. 25 steel.

[0063] The implementation of the present invention is as follows: the process design is still carried out by using the metal liquid surface gas protection technology, the smooth filling and pouring system design technology, and the advanced computer simulation technology, and mainly adopts the steel structure nested core hole forming technology, large temperature difference cooling Technology, narrow gap molding sand technology, pouring dispersed gate drainage technology, thick and large chassis forced cooling technology, etc.

[0064] In this embodiment, the outer steel plate is 20 mm thick, the inner steel plate is 10 mm thick, the gap between the two steel plates is 30 mm, and the steel plates are supported by steel pipes. 30mm.

[0065] In this embodiment, the pressure of compressed air is 0.5MPa, and the gas flow rate ...

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Abstract

The invention relates to a technology for casting a large hollow steel ingot, in particular to a method for manufacturing a low segregation large hollow steel ingot. The manufacturing method is applicable to the process for manufacturing the large hollow steel ingot which is less than 250 tons, made of various materials and has various models and specifications. Besides, computer simulation technique is utilized for reasonably designing an steel ingot mould and a gating system, steel structure nesting core pore-forming technology, large air flow cooling technology, injecting stream protection technology and metal liquid early-stage covering technology are mainly adopted in the manufacturing method, thus guaranteeing stability of ingot mold filling, reducing secondary oxide inclusion and improving the purity of the steel ingot. The large air flow cooling technology and the steel structure nesting core pore-forming technology guarantee the operability of casting process, control the segregation position of ingot, reduce the defects of shrinkage cavity and looseness and improve the utilization ration of the hollow steel ingot. By adopting the manufacturing method, the problems that a taper core can not be taken out easily and an inner core body is deformed in the manufacturing process of the large hollow steel ingot are solved, meanwhile, the segregation problem of large hollow steel ingot is relieved.

Description

technical field [0001] The invention relates to the casting technology of a large hollow steel ingot, in particular to a method for manufacturing a large hollow steel ingot with low segregation. It is suitable for the manufacturing process of large hollow steel ingots of various materials, models and specifications below 250 tons. Background technique [0002] The amount of hollow forgings such as large-scale hydrogenation reactors, nuclear power main pipelines, and pipe molds is increasing. In particular, the demand for large hollow forgings used in the chemical and energy industries has doubled in recent years, and the use of hollow steel ingots to forge large hollow forgings can achieve twice the result with half the effort, so the demand for large hollow steel ingots continues unabated. The manufacturing level of large hollow steel ingots in my country is not high, and the output is still very limited. The market for large hollow steel ingots is in short supply. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/04B22C9/10B22D27/04B22D27/00B22D35/04
CPCB22D7/04B22D9/006B22D27/04
Inventor 李殿中董晓亮夏立军徐忠波康秀红傅排先陈露贵李依依杜静波李建军
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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