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Method for improving isometric crystal ratio of high-carbon steel billet

A technology of equiaxed grain rate and billet, which is applied in the field of metallurgy, can solve the problems of low equiaxed grain rate, etc., and achieve the effects of improving production efficiency, improving loose shrinkage defects, and high-efficiency production

Active Publication Date: 2014-01-15
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] for 60 # In the production process of the billet, a series of problems arise due to the low equiaxed grain rate. The present invention provides a method for increasing the equiaxed grain rate of the high carbon steel billet

Method used

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  • Method for improving isometric crystal ratio of high-carbon steel billet
  • Method for improving isometric crystal ratio of high-carbon steel billet
  • Method for improving isometric crystal ratio of high-carbon steel billet

Examples

Experimental program
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Effect test

Embodiment 1

[0017] An electromagnetic stirring method for increasing the equiaxed grain rate of high carbon steel billet, producing 60 # High carbon steel 120×120mm billet, the specific steps are as follows:

[0018] (1) During the continuous casting process, the pouring is protected throughout the process, and the superheat is 33°C.

[0019] (2) The average casting speed corresponding to each crystallizer is 2.90 m / min, the cooling ratio of the secondary cooling water in the secondary cooling section of each crystallizer is 1.0 L / kg, and the whole process is air mist cooling,

[0020] (3) The electromagnetic stirrer is 20mm away from the lower edge of the crystallizer, and the electromagnetic stirring of the crystallizer under the conditions of 325A and 4.5Hz is used.

[0021] Table 1 Chemical composition of steel grades (%)

[0022] C

Si

mn

P

S

0.60

0.24

0.58

0.018

0.009

[0023] Table 2 Implementation process and effect

[0024...

Embodiment 2

[0026] An electromagnetic stirring method for increasing the equiaxed grain rate of high carbon steel billet, producing 60 # High carbon steel 120×120mm billet, the specific steps are as follows:

[0027] (1) During the continuous casting process, the pouring is protected throughout the process, and the superheat is 30°C.

[0028] (2) The average casting speed corresponding to each crystallizer is 2.83m / min, the cooling ratio of the secondary cooling water in the secondary cooling section of each crystallizer is 0.9L / kg, and the whole process is air mist cooling,

[0029] (3) The electromagnetic stirrer is 22mm away from the lower edge of the crystallizer, and the electromagnetic stirrer of the crystallizer under the condition of 295A and 4.0Hz is used.

[0030] Table 3 Chemical composition of steel grades (%)

[0031] C

Si

mn

P

S

0.58

0.26

0.56

0.019

0.007

[0032] Table 4 Implementation process and effect

[0033] ...

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Abstract

The invention provides a method for improving the isometric crystal ratio of a high-carbon steel billet. The high-carbon steel comprises, by weight, 0.57%-0.65% of C, 0.17%-0.37% of Si, 0.4%-0.8% of Mn, 0.025% of P, 0.025% of S, and the balance Fe and inevitable impurities. The degree of superheat of molten steel is 25-35 DEG C. The blank casting speed is 2.5-2.9m / min. The secondary cooling specific water flow is 0.9-1.2L / kg. An electromagnetic stirrer is placed at a position 18-22mm away from the lower edge of a crystallizer, the current intensity of the electromagnetic stirrer is 290-330A, and electromagnetic stirring frequency is 4.0-4.6Hz. According to the method for improving the isometric crystal ratio of the high-carbon steel billet, the isometric crystal ratio of a 60# billet can be stably improved to 20%, and the high casing speed enables production efficiency to be improved. Therefore, high-efficiency production is guaranteed, defects of loosening and shrinkage caused by insufficient isometric crystal ratio in the prior art are overcome or eliminated, and the defects are prevented from being passed onto the steel rolling procedure.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for increasing the equiaxed crystal ratio of a high-carbon steel billet. Background technique [0002] The solidification structure of the continuous casting slab consists of three parts from the surface to the center: chilled layer, columnar grain area and equiaxed grain area. Since the crystals of the columnar grain structure have obvious directionality and poor processing performance, it is easy to cause defects such as center segregation, center porosity, and center cracks. Therefore, during the solidification process of the continuous casting slab, the development of the columnar grain area should be suppressed as much as possible to promote Equiaxed domain expansion with isotropy. [0003] Compared with columnar crystals, equiaxed crystal grains cross each other when they grow up, the overlap between branches is firm, cracks are not easy to expand, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B22D11/16C22C38/04
Inventor 朱晓雷郭晓波贾吉祥张宁赵成林郭庆涛倪翀奕廖相巍
Owner ANGANG STEEL CO LTD
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