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Method for eliminating central shrinkage cavities and shrinkage porosities of continuously-cast steel ingot

A technology for center shrinkage and continuous casting of steel, which is applied in the field of eliminating center shrinkage and porosity of continuous casting ingots, and can solve the problems of poor center quality, high rejection rate, and difficulty in large-scale development of continuous casting ingots, so as to prevent internal cracks, The effect of eliminating shrinkage and reducing porosity and shrinkage

Active Publication Date: 2011-08-31
中科西王特钢有限公司
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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 eliminating the shrinkage cavity and porosity defects in the center of large continuous casting steel ingots, so as to solve the problems in the prior art that the center quality of continuous casting steel ingots is poor, the rejection rate is high, and it is difficult to develop to large-scale

Method used

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  • Method for eliminating central shrinkage cavities and shrinkage porosities of continuously-cast steel ingot
  • Method for eliminating central shrinkage cavities and shrinkage porosities of continuously-cast steel ingot
  • Method for eliminating central shrinkage cavities and shrinkage porosities of continuously-cast steel ingot

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Experimental program
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Effect test

Embodiment 1

[0040] Continuous casting ingot material: 45# steel;

[0041] Continuous casting ingot diameter: 600mm;

[0042] Continuous casting ingot height: 10m;

[0043] Continuous casting ingot drawing speed: 0.3m / min;

[0044] Metal rod material: 45# steel;

[0045] Metal rod diameter: 20mm;

[0046] Metal rod length: 8.5m;

[0047] Timing of metal rod insertion: 1 hour after continuous casting;

[0048] The rotation speed of the metal rod ω=30rpm;

[0049]In this embodiment, a good metallurgical bond has been achieved between the metal rod and the continuously cast steel ingot. Non-destructive testing found that there were no porosity, shrinkage cavity and shrinkage crack defects inside the continuous casting ingot.

Embodiment 2

[0051] Continuous casting ingot material: 20CrNi2Mo;

[0052] Continuous casting ingot diameter: 1000mm;

[0053] Continuous casting ingot height: 8m;

[0054] Continuous casting ingot drawing speed: 0.1m / min;

[0055] Metal rod material: 20CrNiMo;

[0056] Metal rod diameter: 60mm;

[0057] Metal rod length: 6.5m;

[0058] Metal rod insertion timing: 2 hours after continuous casting;

[0059] The rotation speed of the metal rod ω=20rpm;

[0060] Such as Figure 2(a)-Figure 2(b) As shown, in this embodiment, a good metallurgical bond has been achieved between the metal rod and the continuously cast steel ingot. Non-destructive testing found that there was no shrinkage cavity or porosity inside the continuous casting steel ingot.

[0061] Such as Figure 3(a)-Figure 3(b) As shown, when the metal rod is not rotated and inserted, the center of the large continuous casting ingot has defects of center porosity, shrinkage cavity and shrinkage crack, the quality of the cente...

Embodiment 3

[0063] Continuous casting ingot material: Q235;

[0064] Continuous casting ingot diameter: 1500mm;

[0065] Continuous casting ingot height: 6m;

[0066] Continuous casting ingot drawing speed: 0.03m / min;

[0067] Metal rod material: Q235;

[0068] Metal rod diameter: 150mm;

[0069] Metal rod length: 4m;

[0070] Metal rod insertion timing: 3 hours after continuous casting;

[0071] The rotation speed of the metal rod ω=8rpm;

[0072] In this embodiment, a good metallurgical bond has been achieved between the metal rod and the continuously cast steel ingot. Non-destructive testing found that there is no porosity, shrinkage cavity and shrinkage crack defects in the core of the continuous casting steel ingot; there is a very small amount of porosity around the metal rod.

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Abstract

The invention belongs to the field of steel ingot manufacturing and metallurgical engineering, particularly relates to a method for eliminating the central shrinkage cavities and shrinkage porosities of a continuously-cast steel ingot, which aims to solve the problem that in the prior art, the continuously-cast steel ingot is poor in center quality, high in rejection ratio, and difficult to be subjected to large-scale development. The method comprises the following steps: according to the diameter of a continuously-cast steel ingot and the size of a liquid core thereof, selecting a metal bar with a certain size, wherein the chemical compositions of the metal bar are same as or similar to those of the continuously-cast steel ingot; and through using a rotary inserting method, inserting themetal bar into the axle center of the continuously-cast steel ingot so as to melt the metal bar by aid of the heats of the central liquid core of the continuously-cast steel ingot and then realize the metallurgical combination of the metal liquid core and the metal bar, thereby achieving the purpose of reducing and eliminating the central shrinkage cavities and shrinkage porosities of the continuously-cast steel ingot.

Description

technical field [0001] The invention belongs to the field of steel ingot manufacture and metallurgical engineering, in particular to a method for eliminating shrinkage cavity and porosity in the center of continuous casting steel ingot. Background technique [0002] Steel ingots are the base material of large forgings. Large forgings forged from steel ingots are widely used in energy fields such as hydropower, thermal power, and nuclear power, metallurgical fields such as mining, steelmaking, and rolling, and transportation fields such as trains, automobiles, and ships. Large-scale forgings are the core and backbone components of large-scale equipment in many industries, such as thermal power low-voltage rotors, large marine crankshafts, and back-up rolls for wide and thick plate rolling mills. The quality of large-scale forgings determines the operation quality of large-scale equipment, and the key to determining the quality of large-scale forgings is steel ingots. my count...

Claims

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Application Information

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IPC IPC(8): B22D11/12
Inventor 李殿中栾义坤夏立军傅排先康秀红李依依
Owner 中科西王特钢有限公司