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Device and method for preparing large cast ingot through slag protection based multi-layer casting magnetic field current compound treatment

A magnetic field current and compound processing technology, applied in the field of metallurgy and casting, can solve the problems affecting the material yield, utilization rate, forming performance, energy consumption, affecting product performance and material utilization, insufficient continuous control, natural and other problems , to improve the de-inclusion effect, improve the slag de-inclusion effect, and eliminate the effects of macrosegregation

Active Publication Date: 2019-10-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the mother blank of metal materials, the quality, performance, cost and other aspects of ingots restrict and affect the subsequent processing technology, affecting the performance of the final product and the utilization rate of materials
[0003] However, ingots usually have shortcomings such as composition, uneven structure, serious segregation, and easy cracks, and cannot be eliminated or weakened in subsequent processing, which seriously affects the yield, utilization, formability, performance, and energy consumption of the material.
In order to improve the performance of the ingot, many casting methods have been developed: In order to reduce the temperature gradient, the semi-continuous casting that appears in order to make the composition and structure of the ingot more uniform, but there is an air gap, the molten pool is deep, and the macro-segregation in the large ingot is serious , and it is easy to form cracks; the hot top semi-continuous casting occurs due to the heat loss of the melt, but the height of the molten pool will be enlarged, and the segregation is serious. The gas film hot-top casting with subcutaneous segregation is effective on small-sized ingots, but it is difficult to control large-sized ingots; in order to enhance forced convection or avoid casting under the action of an external field that occurs in contact with the wall, the equipment is complicated and the cost is high. At the same time, the macro-segregation is still relatively obvious; in order to reduce the occurrence of macro-segregation in the multi-ladle casting method, the control of the composition of each ladle of molten steel is not continuous and natural enough, and when the next ladle of molten steel is added, the solidified part will be scoured and Remelting additionally causes uneven local composition. At the same time, with the solidification of the same ladle of molten steel, the molten pool gradually decreases. After injecting the next ladle, the molten pool increases rapidly and changes periodically, causing macroscopic The periodic change of segregation; in order to reduce the molten pool to weaken the electroslag remelting method of macro segregation, through electroslag remelting, the molten pool is always kept small and the macro segregation is reduced, but the self-consumable raw material electrode rod is usually not as good as multi-pack Like casting, the macro segregation is further reduced by adjusting the composition, and the energy consumption is relatively large

Method used

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  • Device and method for preparing large cast ingot through slag protection based multi-layer casting magnetic field current compound treatment
  • Device and method for preparing large cast ingot through slag protection based multi-layer casting magnetic field current compound treatment
  • Device and method for preparing large cast ingot through slag protection based multi-layer casting magnetic field current compound treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this example, 5 tons of low-alloy steel Q345 steel ingots are prepared, and the composition is shown in Table 1 below.

[0023] Table 1 Composition of Grade A Q345 Low Alloy Steel

[0024]

[0025] The preparation method of this low-alloy steel Q345 steel ingot comprises the steps:

[0026] (1) Prepare 4 portions of molten steel successively according to the design, with a superheat of 25°C: the first portion is 2 tons, and the carbon content is 0.1% higher (relative to the composition in Table 1, the same below); the second portion is 1 ton, Among them, the carbon content is 0.02% higher; the third 1 ton, the carbon content is 0.08% lower; the fourth 1 ton, the carbon content is 0.14% lower;

[0027] (2) Heating to 1400°C through the heating layer of the riser, adding mold slag at a speed of 0.005t / min, the thickness of the slag is 5-10cm, and after immersing the tapping hole for 2-3cm, add the first molten steel to the into the tundish, and inject molten steel...

Embodiment 2

[0032] This example prepares 20 tons of low-alloy steel Q345 steel ingots, and component is identical with embodiment 1, and its method step is as follows:

[0033] (1) Prepare 6 parts of molten steel according to the design, with a superheat of 15°C: the first part is 5 tons, and the carbon content is 0.05% higher; the second part is 3 tons, and the carbon content is 0.02% higher; the third part is 3 tons. tons, of which the carbon content is normal; the fourth 3 tons, of which the carbon content is 0.04% lower; the fifth 3 tons, of which the carbon content is 0.06% lower;

[0034](2) Open the heating riser and heat to 1400°C, add mold slag at a speed of 0.1t / min until the thickness of the molten slag is 8-12cm, immerse the tapping hole for 3-4cm, then add the first part of molten steel to the middle In the ladle, the molten steel is injected into the ingot mold along the molten steel pipe through the tundish stopper at a speed of 1t / min. At the same time, the tapping hole ri...

Embodiment 3

[0039] This example prepares 200 tons of low-alloy steel Q345 steel ingots, and component is identical with embodiment 1, and its method step is as follows:

[0040] (1) Prepare 8 portions of molten steel successively according to the design, with a superheat of 10°C: the first portion is 25 tons, and the carbon content is 0.1% higher; the second portion is 15 tons, and the carbon content is 0.08% higher; the third portion is 15 tons. 15 tons, of which the carbon content is 0.06% higher; the fourth 15 tons, of which the carbon content is 0.04% higher; the fifth 15 tons, of which the carbon content is 0.02% higher; the sixth 15 tons, of which the carbon content is normal; Seventh portion of 15 tons, of which the carbon content is low by 0.01%; eighth portion of 15 tons, of which carbon content is low by 0.02%; ninth portion of 15 tons, of which carbon content is low by 0.03%; tenth portion of 15 tons, of which carbon content 0.04% lower; 15 tons of the eleventh portion, of whic...

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Abstract

The invention discloses a device and method for preparing large cast ingot through slag protection based multi-layer casting magnetic field current compound treatment. The device comprises a steel ingot mould, a dead head, a slag ladle and a tundish, wherein movable type parallel electrodes and a movable type magnetic field coil are further separately arranged on the upper part of the steel ingotmould; during casting, amount of needed molten steel is firstly determined according to the specification of the large cast ingot, and the amount of the molten steel is divided into a plurality of parts according to the property of easily segregating elements in the molten steel; content of elements which are easily segregated in each part is regulated, so that casting powder is added before the first part of the molten steel is cast, tapping in a slag layer is guaranteed, and impurities are adsorbed; under action of magnetic fields and / or current, the next part of the molten steel is added while the first part of the molten steel is gradually solidified till a molten pool is relatively small, and protective slag is supplemented till all of the molten steel is cast to prepare the cast ingot. The casting method disclosed by the invention can purify the molten steel, relieves and even eliminates gross segregation, and alleviates shrinkage cavity and porosity.

Description

technical field [0001] The invention belongs to the field of metallurgy and casting, and in particular relates to a device and method for preparing large ingots based on slag-protected multi-layer casting magnetic field-current composite treatment. Background technique [0002] Although the continuous casting and rolling process has been widely used, more than 20% of the metal materials still need to go through the casting process. The obtained ingots are subjected to subsequent processing such as forging and heat treatment to form final components; among them, large castings and forgings are basic industrial components such as national defense, metallurgy, petrochemicals, transportation, electric power, and basic machinery, which are directly related to major national projects and the national economy and people's livelihood. An important indicator of the strength of the country as a whole. As the mother blank of metal materials, the quality, performance, cost and other as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D9/00B22D7/12B22D1/00
CPCB22D1/00B22D7/12B22D9/003
Inventor 翟启杰苏月莹申延平常旺叶春洋徐燕祎张云虎徐智帅宋长江
Owner SHANGHAI UNIV
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