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Method for re-pouring and eliminating central contraction cavity and looseness of continuous casting steel ingot through long water gap

A center shrinkage cavity and continuous casting steel technology, which is applied in the field of steel ingot manufacturing and metallurgical engineering, can solve the problems of high scrap rate, poor center quality of continuous casting steel ingots, difficulty in large-scale development, etc., and achieve the effect of eliminating center looseness

Active Publication Date: 2011-08-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Method for re-pouring and eliminating central contraction cavity and looseness of continuous casting steel ingot through long water gap
  • Method for re-pouring and eliminating central contraction cavity and looseness of continuous casting steel ingot through long water gap
  • Method for re-pouring and eliminating central contraction cavity and looseness of continuous casting steel ingot through long water gap

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Effect test

Embodiment 1

[0035] Continuous casting steel ingot material: Q345;

[0036] Continuous casting ingot diameter: 600mm;

[0037] Height of continuous casting ingot: 10m;

[0038] Continuous casting steel ingot drawing speed: 0.3m / min;

[0039] Inner diameter of long nozzle: 20mm;

[0040] Long nozzle length: 8m;

[0041] Timing of long nozzle insertion: 1h after continuous casting;

[0042] Weight of supplemental molten metal: 200kg;

[0043] In this example, the non-destructive flaw detection found that there were no porosity, shrinkage cavity and shrinkage cracks in the continuous cast steel ingot.

Embodiment 2

[0045] Continuous casting steel ingot material: 20CrNi2Mo;

[0046] Diameter of continuous casting steel ingot: 1000mm;

[0047] Height of continuous casting ingot: 8m;

[0048] Continuous casting steel ingot drawing speed: 0.1m / min;

[0049] Inner diameter of long nozzle: 60mm;

[0050] Long nozzle length: 6m;

[0051] Timing of long nozzle insertion: 2h after continuous casting;

[0052] Weight of supplemental molten metal: 800kg;

[0053] Such as Figure 2(a)-Figure 2(b) As shown, in this embodiment, the continuous casting ingot adopts the long nozzle supplementary pouring technology, and the non-destructive inspection found that there is no shrinkage cavity or loose defect in the steel ingot.

[0054] Such as Figure 3 (a)-Figure 3 (b) As shown, when the long nozzle supplementary pouring is not implemented, the center of the large continuous casting steel ingot has center looseness, shrinkage cavity and shrinkage cracking defects, the quality of the steel ingot center is poor, and the ...

Embodiment 3

[0056] Continuous casting steel ingot material: 34MnV;

[0057] Diameter of continuous casting steel ingot: 1500mm;

[0058] Height of continuous casting ingot: 6m;

[0059] Continuous casting steel ingot drawing speed: 0.03m / min;

[0060] Inner diameter of long nozzle: 100mm;

[0061] Long nozzle length: 4m;

[0062] Timing of long nozzle insertion: 4h after continuous casting;

[0063] Weight of supplemental molten metal: 800kg;

[0064] In this embodiment, the continuous cast steel ingot has undergone non-destructive testing, and the core has no defects of porosity, shrinkage cavity and shrinkage cracking.

[0065] The results show that according to the diameter of the continuous cast steel ingot and the size of the liquid core, the present invention inserts a nozzle of appropriate diameter and length into the axis of the continuous cast steel ingot after the continuous cast steel ingot has solidified for a certain period of time to refill a certain weight of molten metal. The purpose o...

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Abstract

The invention belongs to the field of steel ingot manufacturing and metallurgical engineering, in particular to a method for re-pouring and eliminating a central contraction cavity and the looseness of a continuous cast steel ingot through a long water gap, and solves the problem that the central quality of the continuous cast steel ingot is low, the rejection rate is high and a large continuous cast steel ingot is difficult to develop in the prior art. When the steel ingot is produced in a continuous casting way, after throwing is finished and the steel ingot is solidified for some time, thelong water gap with a specific size is inserted into the center of the steel ingot to a certain depth from the top of the steel ingot and molten steel is re-poured. With the continuous pouring of themolten steel, the long water gap gradually rises to the top of the steel ingot. The aim of reducing and eliminating the central contraction cavity and the looseness of the continuous cast steel ingotis fulfilled by supplementing molten metal required by solidification contraction through the method for re-pouring the molten steel through the long water gap.

Description

Technical field [0001] The invention belongs to the field of steel ingot manufacturing and metallurgical engineering, and specifically is a method for eliminating shrinkage and looseness in the center of a continuous casting steel ingot through supplemental pouring of a long nozzle. Background technique [0002] Steel ingots are the base material of large forgings. Large forgings forged from steel ingots are widely used in hydropower, thermal power, nuclear power and other energy fields, as well as metallurgical fields such as mining, steelmaking, steel rolling, and transportation fields such as trains, automobiles, and ships. Large forgings are the core and backbone components of large equipment in many industries, such as thermal power low-pressure rotors, large-scale marine crankshafts, and wide and heavy plate mill backing rolls. The quality of large forgings determines the operating quality of large equipment, and the key to determining the quality of large forgings is steel...

Claims

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Application Information

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IPC IPC(8): B22D11/10B22D11/12
Inventor 李殿中栾义坤夏立军傅排先康秀红李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI