Control method for casting blank surface cracks caused by proeutectoid ferrites

A pro-eutectoid ferrite and control method technology, applied in the field of metallurgy, can solve problems such as limiting steelmaking and steel rolling connection

Inactive Publication Date: 2020-01-07
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the rapid development of the metallurgical industry, processes such as continuous casting and rolling, hot charging and hot delivery have been greatly developed, so the quality requirements for continuous casting slabs are more strin...

Method used

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  • Control method for casting blank surface cracks caused by proeutectoid ferrites
  • Control method for casting blank surface cracks caused by proeutectoid ferrites
  • Control method for casting blank surface cracks caused by proeutectoid ferrites

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Experimental program
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Effect test

Embodiment 1

[0017] First, the infrared thermometer is used to continuously measure the surface temperature of the slab from the crystallizer to the straightening section, and then the point where the surface temperature of the slab experiences 800°C for the first time is selected as the starting point of enhanced cooling in this method; After the slab temperature range, a row of cooling water nozzles with a cooling width of 10mm is installed in this area, the cooling water flow rate is 1 L / min, and the cooling water pressure is 0.4MPa to forcefully cool the surface of the slab without affecting the internal temperature of the slab . In addition to adding a row of nozzles to the continuous casting machine, other process parameters of the continuous casting machine remain unchanged.

Embodiment 2

[0019] First, the infrared thermometer is used to continuously measure the surface temperature of the slab from the crystallizer to the straightening section, and then the point where the surface temperature of the slab experiences 800°C for the first time is selected as the starting point of enhanced cooling in this method; After the slab temperature range, a row of cooling water nozzles with a cooling width of 30mm is installed in this area, the cooling water flow rate is 1 L / min, and the cooling water pressure is 0.4MPa to forcefully cool the surface of the slab without affecting the internal temperature of the slab . In addition to adding a row of nozzles to the continuous casting machine, other process parameters of the continuous casting machine remain unchanged.

Embodiment 3

[0021] First, the infrared thermometer is used to continuously measure the surface temperature of the slab from the crystallizer to the straightening section, and then the point where the surface temperature of the slab experiences 800°C for the first time is selected as the starting point of enhanced cooling in this method; After the slab temperature range, a row of cooling water nozzles with a cooling width of 10mm is installed in this area, the cooling water flow rate is 3 L / min, and the cooling water pressure is 0.4MPa to forcefully cool the surface of the slab without affecting the internal temperature of the slab . In addition to adding a row of nozzles to the continuous casting machine, other process parameters of the continuous casting machine remain unchanged.

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Abstract

The invention discloses a control method for casting blank surface cracks caused by proeutectoid ferrites, and provides a process for controlling the casting blank surface cracks caused by the proeutectoid ferrites. A row of small-spraying-angle cooling water nozzles is added in front of a straightening section of a continuous casting machine; a narrow-area surface cooling zone is provided; and the purpose of controlling the surface cracks is achieved by elimination of the surface proeutectoid ferrites without influencing internal structures through surface forced cooling in small areas. The method can realize large-scale production, can effectively control the generation of the proeutectoid ferrites on the surfaces of hypoeutectoid steel casting blanks, and effectively controls the crackscaused by the proeutectoid ferrites on the surfaces of this steel types.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a control method for controlling cracks on the surface of a slab caused by the existence of proeutectoid ferrite on the surface of a slab during continuous casting production. Background technique [0002] With the rapid development of the metallurgical industry, processes such as continuous casting and rolling, hot charging and hot delivery have been greatly developed, so the quality requirements for continuous casting slabs are more stringent. Although many new continuous casting technologies and a series of optimization measures have been obtained It is widely used, but the cracks on the surface of the slab are still the bottleneck problem that limits the connection between steelmaking and rolling. Slab surface cracks are one of the biggest problems that plague the quality improvement of slabs. The surface quality of slabs directly affects the quality of rolled ...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D11/114B22D11/124B22D11/22
CPCB22D11/114B22D11/1246B22D11/16B22D11/22
Inventor 陈波涛邢立东蒋凌枫曾凡政包燕平王敏
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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