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

A technology of continuous casting process and design method, which is applied in the field of iron and steel smelting, and can solve problems such as not considering the relationship between casting speed and secondary cooling water volume

Active Publication Date: 2020-08-28
SGIS SONGSHAN CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, these secondary cooling processes all consider the influence of the secondary cooling water on the surface quality of th

Method used

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

Examples

Experimental program
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Effect test

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 invention relates to the field of iron and steel smelting, and in particular relates to a design method of secondary cooling water in a continuous casting process of high-carbon steel and a preparation method of continuous casting billet. The cooling water quantity of each area of a secondary cooling area is distributed according to the formula A*V<2>+B*V+C, wherein for the foot roller area, Ais 0.18 to 0.22, B is 1.39 to 1.43, and C is 0.92 to 0.96; for the area I, A is 0.82 to 0.86, B is -0.97 to -1.01, and C is 2.75 to 2.79; for the area II, A is 0.45 to 0.49, B is -0.25 to -0.29, andC is 0.75 to 0.79; and for the area III, A is 0 to 0.04, B is 1 to 1.05, and C is -1.1 to -1.16. With the methods, when the pulling speed of the high-carbon steel casting billet is controlled to be 1.1 m/min-2.1 m/min, the casting billet has no surface or internal cracks or center segregation, and the bleed-out rate during pouring is the minimum.

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...

Claims

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Application Information

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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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