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Design method of secondary cooling water and preparation method of continuous casting slab in high carbon steel continuous casting process

A technology of continuous casting process and design method, applied in the field of iron and steel smelting, can solve the problem of not considering the relationship between the billet pulling speed and the amount of secondary cooling water, and achieve small shrinkage, low thermal shrinkage coefficient, and no center segregation. Effect

Active Publication Date: 2021-08-13
SGIS SONGSHAN CO LTD
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Problems solved by technology

[0006] However, these secondary cooling processes all consider the influence of the secondary cooling water on the surface quality of the slab separately, and do not consider the relationship between the casting speed of the slab and the amount of secondary cooling water.

Method used

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  • Design method of secondary cooling water and preparation method of continuous casting slab in high carbon steel continuous casting process
  • Design method of secondary cooling water and preparation method of continuous casting slab in high carbon steel continuous casting process
  • Design method of secondary cooling water and preparation method of continuous casting slab in high carbon steel continuous casting process

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Embodiment 12～14 and comparative example 1～3

[0109] Embodiments 12-14 and Comparative Examples 1-3 all provide a method for preparing high-carbon steel continuous casting slabs, and the manufacturing steps and high-carbon steel components are the same. The difference lies in the process parameters of mold flux and crystallizer. Examples 12-14 and Comparative Examples 1-3 The design of the secondary cooling water is the same as that of Example 11, the casting speed is 2.1m / min, and the specific water volume of the secondary cooling water is 0.49-0.57L / kg. Specific different process parameters are shown in Table 3 to Table 5:

[0110] Table 3 Chemical Composition of Mold Flux (wt%)

[0111]

[0112] Table 4 Physical indicators of mold flux

[0113] Mold flux Melting point / ℃ Melting speed / S Bulk density g / ml Viscosity pa.s Alkalinity Example 12 1043 41 0.71 0.286 0.65 Example 13 1053 40 0.70 0.295 0.63 Example 14 1064 39 0.72 0.267 0.66 Comparative example 1 1112 ...

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Abstract

The present application relates to the field of iron and steel smelting, and in particular, to a method for designing secondary cooling water in a continuous casting process of high carbon steel and a method for preparing a continuous casting billet. The amount of cooling water in each zone of the secondary cooling zone is based on the formula A×V 2 +B×V+C allocation. Foot roller area: A is 0.18-0.22; B is 1.39-1.43; C is 0.92-0.96; Area 1: A is 0.82-0.86; B is -0.97--1.01; C is 2.75-2.79; Area 2: A 0.45-0.49; B is -0.25--0.29; C is 0.75-0.79; three zones: A is 0-0.04; B is 1-1.05; C is -1.1--1.16. The method can ensure that when the pulling speed of the high carbon steel billet is controlled within 1.1m / min to 2.1m / min, the billet has no surface, internal cracks, no center segregation, and the leakage rate during casting is minimal.

Description

technical field [0001] The present application relates to the field of iron and steel smelting, in particular, to a method for designing secondary cooling water in a high-carbon steel continuous casting process and a method for preparing continuous casting slabs. Background technique [0002] The C content of high carbon steel is relatively high, and the general C content is 0.5-1.7%. Due to the high carbon content, quality defects such as cracks are prone to occur during continuous casting of slabs, and in severe cases, steel breakouts are caused. [0003] The continuous casting secondary cooling refers to the forced uniform cooling of the slab in the length interval from the crystallizer outlet to the tension leveler during the continuous casting steelmaking process. This interval is called the secondary cooling zone. This section is equipped with a water spray system and a series of nip roll devices arranged in a straight line (vertical continuous casting machine) or ar...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/22C22C38/04C22C38/16C22C38/08
CPCB22D11/225C22C38/002C22C38/008C22C38/04C22C38/08C22C38/16
Inventor 郭峻宇万翔戴文笠寻忠忠曾令宇刘志明张志明王冠孙忠权叶德新谭奇峰刘金源雷中钰刘志龙黎莉
Owner SGIS SONGSHAN CO LTD
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