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Method for avoiding steel plate surface hot sending direct loading cracks

A red delivery and direct loading technology, applied in the field of steelmaking, can solve the problems of long heating time of warm or cold billets, reduce the temperature of continuous casting slabs into the furnace, prolong the time of continuous casting slabs in the furnace, etc., and achieve short , Reduce gas consumption and improve production efficiency

Inactive Publication Date: 2017-03-29
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are obvious defects in the "stack cooling" process: first, the furnace temperature of the continuous casting slab is reduced, the furnace time of the continuous casting slab is prolonged, and the gas consumption of the heating furnace is increased; second, the warm slab or The heating time of the cold slab is long, the burning loss of the continuous casting slab is serious, and the metal consumption is increased; thirdly, the "stack cooling" process also increases the inventory of the continuous casting slab, resulting in an increase in financial costs

Method used

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  • Method for avoiding steel plate surface hot sending direct loading cracks
  • Method for avoiding steel plate surface hot sending direct loading cracks
  • Method for avoiding steel plate surface hot sending direct loading cracks

Examples

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Embodiment 1

[0016] A new method to avoid "red-send direct loading cracks" on the surface of steel plates after rolling. Ni=0.10%~0.20%, the slab thickness is 260mm. Specific steps are as follows:

[0017] (1) After the continuous casting slab 4 is cut into a fixed length, the burrs on the continuous casting slab 4 are removed by the deburring device 1, and then transported to the specially designed rapid cooling device 2 area.

[0018] (2) The high-strength and high-density fast cooling device installed on the conveying roller table of the continuous casting slab 4 implements high-intensity and high-density impingement jet cooling on the upper surface of the continuous casting slab 4 for 121 seconds; spray cooling on the lower surface for 165 seconds, and measured The upper surface temperature of the continuous casting slab 4 was 545°C. The water quality of the continuous casting slab 4 cooling impact jet water adopts the continuous casting secondary cooling water, and the pressure is c...

Embodiment 2

[0023] A new method for avoiding "red-sending and straight-loading cracks" on the surface of steel plates after rolling. Ni=0.30%~0.50%; slab thickness=300mm. Specific steps are as follows:

[0024] (1) After the continuous casting slab 4 is cut into a fixed length, the burrs on the continuous casting slab 4 are removed by the deburring device 1, and then transported to the specially designed rapid cooling device 2 area.

[0025] (2) Through the specially designed high-strength and high-density fast cooling device installed on the conveying roller table of the continuous casting slab 4, the continuous casting slab 4 is subjected to high-strength and high-density impinging jet cooling on the upper surface for 145 seconds; spray cooling on the lower surface for 200 seconds Seconds, the surface temperature of the upper continuous casting slab 4 was measured to be 528°C. The water quality of the continuous casting slab 4 cooling impact jet water adopts the continuous casting sec...

Embodiment 3

[0030] A new method for avoiding "red-sending and straight-loading cracks" on the surface of steel plates after rolling. Ni=0.64%~0.66%, the slab thickness is 300mm. Specific steps are as follows:

[0031] (1) After the continuous casting slab 4 is cut into a fixed length, the burrs on the continuous casting slab are removed by the deburring device 1, and then transported to the specially designed rapid cooling device 2 area.

[0032] (2) Through the specially designed high-strength and high-density fast cooling device installed on the conveying roller table of the continuous casting slab 4, the continuous casting slab 4 is subjected to high-strength and high-density impinging jet cooling on the upper surface for 150 seconds; spray cooling on the lower surface for 210 seconds Seconds, the surface temperature of the upper continuous casting slab 4 was measured to be 511°C. The water quality of the continuous casting slab 4 cooling impact jet water adopts the continuous castin...

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Abstract

A method for avoiding steel plate surface hot sending direct loading cracks is characterized in that an on-line continuous casting sheet billet is cut in a fixed-length mode; burrs on cutting end faces of the continuous casting sheet billet are removed through deburring devices, and then the continuous casting sheet billet is sent to a specially-designed high-strength and high-density rapid cooling device area; the continuous casting sheet billet is subjected to high-strength and high-density impact jet flow cooling for 120-150 seconds through continuous casting secondary cooling water with the water pressure of 1.0-1.2 MPa; the ratio of the lower surface spraying time to the upper surface spraying time is equal to 1.3-1.5; and the temperature of the upper surface of the casting billet is rapidly reduced below 550 DEG C. Then the continuous casting sheet billet is sent into a heating boiler directly through a continuous casting sheet billet rollgang, heated to the required temperature and then rolled. According to the method, the continuous casting sheet billet is prevented from the hot sending direct loading cracks of the rolled steel plate surface caused by the process of hot sending direct loading.

Description

technical field [0001] The invention belongs to the field of steelmaking, and in particular relates to a method for avoiding cracks on the surface of steel plates. Background technique [0002] In order to reduce the production cost of wide and thick slabs, many wide and thick slab manufacturers adopt the continuous casting slab "red delivery and direct loading" process, that is, the continuous casting slab is directly sent into the heating furnace through the roller table, so as to improve the continuous casting slab into the furnace temperature, shorten the time of continuous casting slab in the furnace, thereby reducing the gas consumption of the heating furnace, and improving the production efficiency of the wide and thick plate rolling mill. However, peritectic high manganese microalloyed steels containing microalloying elements such as nickel and niobium adopt the continuous casting slab "red delivery direct loading" process, and the surface of the steel plate after ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/124B22D11/128C22C38/04C22C38/12C22C38/08
CPCB22D11/124B22D11/128C22C38/04C22C38/08C22C38/12
Inventor 何航郑生斌刘永龙彭杨
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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