Cooling process for eliminating banded structure of steel ingot

A technology of strip structure and cooling process, applied in the field of steel ingot cooling, can solve the problems of excessive strip structure of steel ingot, inconsistent cooling speed, large difference in cooling speed, etc., so as to eliminate the influence of temperature, facilitate use, and avoid strip structure exceeding the standard. Effect

Active Publication Date: 2020-05-12
SHANDONG BAODING HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem in the prior art that the banded structure of the steel ingot exceeds the standard due to the inconsistent cooling speed of each part during the cooling process of the poured steel ingot, the present invention provides a cooling process for eliminating the banded structure of the steel ingot to solve the above problems
The present invention solves the problem of large differences in the overall cooling speed of the steel ingots by eliminating the influence of the temperature between the steel ingots during cooling and controlling the flow of cold air inside the steel ingots, and further solves the problem of the banded structure of the steel ingots exceeding the standard

Method used

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  • Cooling process for eliminating banded structure of steel ingot
  • Cooling process for eliminating banded structure of steel ingot
  • Cooling process for eliminating banded structure of steel ingot

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Experimental program
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Effect test

Embodiment 1

[0038] A cooling process for eliminating the banded structure of steel ingots, the specific steps are as follows:

[0039] (1) Before pouring, install the middle injection pipe and steel ingot mold on the pouring bottom plate;

[0040] (2) Start pouring after installation;

[0041] (3) Prepare the ventilation and cooling device in advance, and hoist the ingot air cooling device between the center injection pipe and the ingot mold within 5 minutes after pouring;

[0042] (4) Turn on the air compressor, and the cold air is blown out from the outlet hole of the air outlet pipe to cool the steel ingot. The cooling procedure is as follows:

[0043] A. Control the outlet pressure of the air compressor to 0.1MPa, and cool down by air cooling for 1 hour;

[0044] B. Adjust and control the outlet pressure of the air compressor to 0.15MPa, and continue to cool down for 1 hour;

[0045] C. After 2 hours of air cooling, turn off the air compressor and stop the ventilation; hang out the...

Embodiment 2

[0048] On the basis of Embodiment 1, the steel ingot air cooling device includes a gas pipeline, an air compressor 6 and a thermal insulation baffle 1 . The ingot air-cooling device is a frame structure, and the frame size matches the center column pipe; the gas pipeline includes an air inlet pipe 2 and an air outlet pipe 3; the air inlet pipe 2 and the air outlet pipe 3 are connected; the air outlet pipe 3 is horizontally circular Set, the number is 3; the outlet pipe 3 is provided with an outlet hole 4 facing outward; the diameter of the outlet hole 4 is 1 to 2 mm, and the number is 4 and arranged equidistantly; the air inlet pipe 2 One end is connected with the air compressor 6; the inlet pipe 2 and the outlet pipe 3 are steel pipes with a diameter of 20mm, and the material is Q235 steel; the heat insulation baffles 1 are 4, arranged in a cross; the heat insulation baffles 1 is connected with the air outlet pipe; the upper and lower ends of the heat insulation baffle 1 are ...

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Abstract

The invention relates to a cooling process for eliminating a banded structure of a steel ingot, and belongs to the technical field of steel ingot cooling. The cooling process comprises the following specific steps that (1) before pouring is carried out, a central pouring pipe and steel ingot molds are mounted on a pouring bottom plate; (2) pouring is started after mounting is finished; (3) a ventilation cooling device is prepared in advance, and a steel ingot air cooling device is hoisted to the position between the central pouring pipe and the steel ingot molds within 5 minutes after pouringis finished; (4) an air compressor is started, cold air is blown out from an air outlet hole of an air outlet pipe, and the steel ingot is cooled; and (5) after the steel ingot is cooled, the steel ingot molds are disassembled, the steel ingot is taken out, sampling detection is carried out, and the steel ingot is put in storage after being detected to be qualified. According to the cooling process, a heat insulation baffle is arranged between the steel ingot molds, and the size of the cold air flow is controlled in the cooling process, so that the situation that the banded structure exceeds the standard due to the fact that the cooling speed of the inner side and the outer side of the steel ingot is inconsistent can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of steel ingot cooling, and in particular relates to a cooling process for eliminating banded structures of steel ingots. Background technique [0002] When producing 17CrNiMo6 gear forgings, the method of pouring molten steel into the ingot mold and then cooling and forming is adopted. The poured steel ingot is located around the center injection pipe, and is cooled and formed by air cooling. However, in the process of air-cooling the steel ingot, the local cooling of the inner side of each steel ingot will be affected by other steel ingots, and the heat dissipation is very slow, resulting in a slow cooling rate of the inner side of the steel ingot. Then lead to when the upper and lower surfaces of the steel ingot are sampled at 120 degrees, there will always be a banded structure at the upper and lower points exceeding the standard, up to level 4, which cannot meet the user's level 2 requirements. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/06B22D7/12
CPCB22D7/06B22D7/12
Inventor 常福华王传刚景财年张姣赵凤更周经经
Owner SHANDONG BAODING HEAVY IND
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