Method for improving steel ingot cooling conditions

A technology for cooling conditions and steel ingots, applied in the field of molten metal casting, can solve the problems of slow heat dissipation of steel ingot molds, and achieve the effects of improving the quality of steel ingots, lowering production costs, and reducing center segregation

Active Publication Date: 2018-03-13
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there is no feasible technology to solve the problem of slow heat dissipation of the ingot mold

Method used

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  • Method for improving steel ingot cooling conditions

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Effect test

Embodiment 1

[0021] Embodiment 1: casting Q345B steel grade octagonal steel ingot with unit weight of 15 tons.

[0022] 1. Process a ring-shaped air outlet groove 4 on the circumference where the upper surface of the chassis 11 of the steel ingot mold 7 contacts the lower end of the steel ingot mold 7, and at the same time process an "L"-shaped air intake channel 1 on the side wall of the chassis 11, the air intake channel The other end of 1 communicates with outlet groove 4.

[0023] 2. Before pouring, first place the bottom plate 14 on the ground at the casting position, place the chassis 11, the upper middle injection pipe 12 and the lower middle injection pipe 13 on the bottom plate 14; then place the steel ingot mold 7 on the chassis 11, and The outer 1 / 3 part of the steel ingot mold 7 in contact with the chassis 11 is sealed with a refractory mud seal 3, and the compressed air pipe 2 is inserted into the air intake channel 1; finally, the thermal insulation cap 9 is placed on the ste...

Embodiment 2

[0028] Embodiment 2: casting single weight 38 tons of 16Mn steel type flat steel ingot.

[0029] Steps 1-3 are the same as in Example 1. The pressure in step 4 is 0.35-0.4 MPa.

[0030] In step 5, the flow rate is controlled at 150 L / min, and after maintaining for 15.5 hours, the insulation cap 9 is removed, the mold is demoulded, and the steel ingot 10 is hoisted out.

[0031] Compared with conventional casting, embodiment 2 basically eliminates the thermal resistance of the air gap between the steel ingot 10 and the steel ingot mold 7, and the cooling strength of the steel ingot 10 is improved. The time from pouring to demoulding is shortened by 1.5 hours. The sequential solidification from bottom to top is strengthened, defects such as central segregation and central porosity of the steel ingot 10 are reduced from grade 1.5 to grade 1.0, and the quality of the steel ingot 10 is improved.

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Abstract

The invention provides a method for improving steel ingot cooling conditions. An annular air outlet groove and an air inlet channel communicated with the annular air outlet groove are machined in a chassis, an ingot mold is placed on the chassis, the exterior of the contact position of the ingot mold and the chassis is sealed through refractory mortar, a compression air pipe is inserted into the air inlet channel, and all components are sealed through the refractory mortar and an asbestos cord. After pouring is carried out, when an air gap is generated between a steel ingot and the ingot mold,an insulation cap is prized to enable an air gap to be generated between the insulation cap and the ingot mold. A valve is opened, compressed air enters the air outlet groove from the air inlet channel from the compression air pipe, then enters the air gap between the ingot mold and the chassis and the air gap between the steel ingot and the ingot mold, and is finally discharged from the gap between the insulation cap and the ingot mold, and continuous flowing and replacement between cold air and hot air are achieved. By means of the method, the problem that heat transferring is limited by the gaps can be effectively solved, the cooling rate of the steel ingot and the ingot mold is increased, sequent setting of the steel ingot from bottom to top is promoted, the defects of center segregation, loosening and the like of the steel ingot are reduced, and the steel ingot quality is improved.

Description

technical field [0001] The invention belongs to the technical field of molten metal casting, and in particular relates to a new method capable of improving cooling conditions of steel ingots. Background technique [0002] The steel ingot mold is used as the carrier of molten steel pouring and cooling for forming. Although this mold casting method has been used to produce steel ingots for more than a hundred years, it is still widely used at present. Steel ingots produced by die casting have quality problems such as low cooling rate, coarse solidification structure and heavy segregation of steel ingots. One of the main reasons for the low cooling rate of the steel ingot is that during the cooling process of the steel ingot, since the steel ingot is solidified and cooled from the liquid state, the temperature difference reaches more than 1200°C, so its shrinkage is much higher than that of the ingot mold, so after pouring, the steel ingot During the cooling process, an air ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/06
CPCB22D7/064
Inventor 黄玉平唐雪峰郭庆涛李德军赵成林吕春风康伟常桂华贾吉祥康磊
Owner ANGANG STEEL CO LTD
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