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Method for producing movable core low segregation large-sized hollow steel ingot

A manufacturing method and technology of hollow steel, which is applied in the field of manufacturing large hollow steel ingots with low segregation of movable cores, can solve problems such as segregation of large hollow steel ingots, achieve the effects of reducing segregation, ensuring purity, and reducing the degree of segregation

Active Publication Date: 2008-11-05
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 large-scale hollow steel ingots with movable core and low segregation, which is suitable for the manufacture of large-scale hollow steel ingots of all levels between 50 and 300 tons, and solves problems such as segregation in the production process of large-scale hollow steel ingots

Method used

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  • Method for producing movable core low segregation large-sized hollow steel ingot
  • Method for producing movable core low segregation large-sized hollow steel ingot
  • Method for producing movable core low segregation large-sized hollow steel ingot

Examples

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Effect test

Embodiment 1

[0055] The material of this embodiment is 16Mn steel, the weight of poured molten metal is 95 tons, and the pouring speed is 5 tons per minute.

[0056] The implementation of the present invention is as follows: in the early days, the surface of the molten metal was designed with electroslag covering and argon gas protection technology, smooth filling and pouring system design technology, advanced computer simulation technology, etc., and the movable core hole forming technology, multiple Strong cooling technology at different stages of various media, movable protection core technology, cooling medium flow and movable core temperature control technology, cooling medium atomization device, chassis protection technology for preventing large temperature difference changes in the chassis. The specific process is as follows:

[0057] 1) The movable core is composed of four layers of steel plates and two layers of molding sand. The outermost layer of steel plates (outer core cylinde...

Embodiment 2

[0067] The material of this embodiment is 16Mn steel, the weight of poured molten metal is 98 tons, and the pouring speed is 6 tons per minute.

[0068] The implementation of the present invention is as follows: in the early days, the surface of the molten metal was designed with electroslag covering and argon gas protection technology, smooth filling and pouring system design technology, advanced computer simulation technology, etc., and the movable core hole forming technology, multiple Strong cooling technology at different stages of various media, movable protection core technology, cooling medium flow rate and movable core temperature control technology, cooling medium atomization device, and chassis protection technology for preventing large temperature difference changes in the chassis. The specific process is as follows:

[0069] 1) The movable core is composed of four layers of steel plates and two layers of molding sand. The outermost layer of steel plates (outer cor...

Embodiment 3

[0078] The material of this embodiment is 16Mn steel, the weight of the molten metal is 97 tons, and the casting speed is 6.5 tons per minute.

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Abstract

The invention relates to a preparation technique for heavy hollow ingots of all levels between 50 tons to 300 tons, in particular to a manufacturing method for heavy hollow ingots with a movable core and low segregation. The manufacturing method is applicable to the preparation process of all heavy hollow ingots cast by adopting movable cores, including the casting of the hollow ingots of various shapes, specifications and materials; besides utilizing simulation means of computers to reasonably design a mould and a casting system for ingots, the manufacturing method mainly adopts a pore-forming technology with a movable core, an intensive cooling technology for various media at different stages, a movable core protection technology, a technology for controlling the flow of a cooling medium and the temperature of the movable core, an atomizing device for the cooling medium, an early electro slag protection and argon protection technology for molten metal and a technology for protecting the chassis from big temperature variation, thereby guaranteeing the purity of the molten metal and the operability and the stability of the casting technique, mitigating the segregation, controlling the segregation position, locating the segregation band of the hollow ingots in the middle position and increasing the utilization rate and the application range of the hollow ingots.

Description

technical field [0001] The invention relates to the preparation technology of large-scale hollow steel ingots of all grades between 50 and 300 tons, in particular to a method for manufacturing large-scale hollow steel ingots with movable cores and low segregation. It is suitable for all the preparation processes of casting large hollow steel ingots with movable cores, including the casting of hollow steel ingots of various shapes, specifications and materials. Background technique [0002] In recent years, the development of industry has made a qualitative leap. The industry's demand for energy is increasing day by day, energy shortage and contradiction between supply and demand are becoming more and more obvious, thus driving the rapid development of China's energy and petrochemical industries. The scale of the industry continues to expand. For example, the consumption of large-scale hydrogenation reactors, nuclear power main pipelines, and large shafts of hydraulic turbine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/04B22D7/06B22D7/12
Inventor 傅排先康秀红夏立军李殿中李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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