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Method for improving internal quality of high-alloy steel billet

An alloy steel billet and internal quality technology, applied in the field of metallurgy, can solve the problems of long solidification time, large section, affecting the performance of steel and the development of high-quality products.

Inactive Publication Date: 2016-09-21
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

[0003] Due to the special type of bloom steel and its large cross-section, the solidification time of the billet is long, and most of the produced steel is medium and high-carbon alloy steel, which is used for rolling heavy rails, bars, bearing steel and spring steel and other special steels, so casting Defects such as shrinkage cavity, center porosity and center segregation are more likely to appear inside the billet, and these defects seriously affect the properties of steel and the development of high-quality products

Method used

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  • Method for improving internal quality of high-alloy steel billet

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Embodiment 1- Embodiment 4

[0029] The alloy steel composition in the above four embodiments is listed in Table 1, and the continuous casting process parameters are listed in Table 2.

[0030] Table 1 alloy steel composition (mass percentage: wt%, balance is Te)

[0031]

[0032] Table 2 continuous casting process parameters

[0033]

[0034] After pouring, the surface quality of the bloom cast slab was inspected on the cooling bed, and the internal quality was inspected by sulfur stamping and hot acid low-magnification inspection, and the quality of the subsequent rolled and hot-processed steel was followed up. During the inspection, no defects were found. The surface and internal quality defects of the slab are obvious, the quality of the slab is good, and the indicators such as looseness in the center of the slab, shrinkage cavity and segregation all meet the requirements. The results of the internal quality inspection of the slab are shown in Table 3.

[0035] Table 3 The internal qual...

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Abstract

The invention relates to the technical field of metallurgy, particularly discloses a method for improving the internal quality of a high-alloy steel billet. The method comprises the following step of producing an alloy steel billet by a continuous casting method, wherein the pulling rate of a casting machine is controlled to be 0.48-0.53 m / min and kept constant, the total rolling reduction of a solidification tail end under dynamic soft reduction is 10-15mm, the water yield of a crystallizer is 4050-4200 L / min, the specific water flow of a secondary cooling area is 0.22-0.26 L / kg. The electromagnetic stirring parameters of the crystallizer are that the electric current is set to be 640-660A, the frequency is set to be 1.6-2.2 HZ, and the superheat degree is set to be 20-30 DEG C. According to the method disclosed by the invention, the reasonable matching of the rolling reduction of the solidification tail end, the pulling rate of the casting machine and the superheat degree is controlled, the cooling water yield of the crystallizer is controlled, the dynamic water distribution of the secondary cooling area is controlled, and besides, the electromagnetic stirring parameters are correspondingly set, so that finally an alloy steel continuous casting billet of which the internal quality is high is produced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for improving the internal quality of a high-alloy billet. Background technique [0002] At present, high-quality alloy steel is produced mainly through low superheat casting, electromagnetic stirring at the end of solidification, and light reduction to improve the quality of the billet. In recent years, especially the continuous casting of alloy steel has a tendency to increase the cross-section of the billet, and Used in some special key products, the quality requirements are very strict. It is necessary to ensure that the processing properties of the steel meet the requirements. While strictly controlling the composition and structure of the steel, the alloy steel is also required to have good internal quality. [0003] Due to the special type of bloom steel and its large cross-section, the solidification time of the billet is long, and most of the produced steel i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B22D11/115B22D11/22C22C38/02C22C38/04C22C38/18C22C38/08C22C38/12
CPCB22D11/115B22D11/18B22D11/225C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18
Inventor 孟保仓张怀军陈建新刘岩军张达先韩春鹏
Owner INNER MONGOLIA BAOTOU STEEL UNION