Continuous casting columnar crystallizer small square blank and its columnar crystal control method

A control method and columnar crystal technology, applied in the iron and steel industry, can solve the problems that limit the high efficiency of continuous casting, achieve the effects of less pores, small shrinkage internal stress, and improved production efficiency

Inactive Publication Date: 2008-03-26
JIANGSU SHAGANG GROUP HUAIGANG SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, although the formation of columnar grains in the slab is suppressed, and the equiaxed grain rate of the slab reaches about 50% (the central area can reach 100%), it limits the development of high-efficiency continuous casting.

Method used

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  • Continuous casting columnar crystallizer small square blank and its columnar crystal control method
  • Continuous casting columnar crystallizer small square blank and its columnar crystal control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Use a conventional electric furnace, converter or other non-vacuum melting furnace for smelting (in this embodiment, converter smelting is used), measure the chemical composition before tapping, and carry out initial adjustment of the composition, and then put the ladle containing molten steel into the refining furnace Carry out refining, and finally take a sample to determine the chemical composition, and use it after meeting the design requirements (obtaining the third furnace steel). The chemical composition (%) of GCr15 bearing steel is shown in Table 1.

[0030] Table 1 Chemical composition of GCr15 bearing steel (%)

[0031] Preface

Number

C

Si

mn

Cr

P

S

Aloxy

Cu

T.[0]

1

0.98

0.23

0.34

1.49

0.012

0.005

0.001

0.04

0.0007

2

1.00

0.27

0.37

1.50

0.015

0.006

...

Embodiment 2

[0057] Still get the molten steel with the chemical composition contained in No. 2 in Table 1 for continuous casting. The process parameters of GCr15 bearing steel continuous casting slab are shown in Table 5.

[0058] Table 5 Process parameters of GCr15 bearing steel continuous casting slab

[0059] crystallization per flow

Secondary cooling section ratio

set pull speed

Water ratio of each stage of secondary cooling

[0060] Container water volume (L

/ min)

amount of water

(L / kg)

(m / min)

Foot roller section: movable section: fixed I section: fixed II

part

2000

1.6

2.4

2∶2∶5∶5

[0061] Obtain 150 square billets of GCr15 bearing steel. The low-magnification inspection of 150 square billets of GCr15 bearing steel shows that the proportion of columnar crystals in the central area of ​​the billet is 95%, and the rest are equiaxed crystals.

[0062] All the other implementations...

Embodiment 3

[0064] Still get the molten steel with the chemical composition contained in No. 2 in Table 1 for continuous casting. The process parameters of GCr15 bearing steel continuous casting slab are shown in Table 6.

[0065] Table 6 Process parameters of GCr15 bearing steel continuous casting slab

[0066] crystallization per flow

Container water volume (L

/ min)

Secondary cooling section ratio

amount of water

(L / kg)

set pull speed

(m / min)

Water ratio of each stage of secondary cooling

Foot roller section: movable section: fixed I section: fixed II

part

2500

1.9

2.5

4∶4∶3∶3

[0067] Obtain 150 square billets of GCr15 bearing steel. The low-magnification inspection of the 150 billet of GCr15 bearing steel shows that the proportion of columnar crystals in the central area of ​​the billet is 98%, and the rest are equiaxed crystals.

[0068] All the other implementations are as in ...

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Abstract

The present invention discloses a continuous cast columnar crystal square billet and its columnar crystal control method. It is characterized by that said square billet is continuously cast by using molten steel containing chemical components of screw-thread steel, carbon structure steel, alloy structure steel, spring steel, bearing steel, low-alloy high-strength steel, hard wire steel or cold-short steel. The columnar crystal rate in the central zone of said square billet is 90-100%, and its equiaxed crystal rate is 0-10%. Said invention utilizes forced cooling and thermal stress downwards compression of continuous casting process to raise uniformity of material components, reduce segregation value of material components and internal defect probability and raise columnar crystal rate of square billet, at the same time, said invention adopts forced cooling and high drawing speed so as to make continuous casting machine efficiency be raised by 10%-40%.

Description

Technical field: [0001] The invention relates to the iron and steel industry, in particular to a method for controlling columnar crystals in the continuous casting process of steel slabs. Background technique: [0002] At present, it is generally believed in China that the development of columnar crystals in continuous casting slabs will inevitably increase the level of internal defects such as segregation, porosity, shrinkage cavities, and internal cracks in the slab. Bridge", the internal defects are more serious. Therefore, domestic excellent special steel enterprises generally pursue the equiaxed crystal ratio of continuous casting slabs, and generally adopt "low casting speed, weak cooling process" (the casting speed is generally 0.7-2.0m / min). In the edge area and central area, the organizational structure is mainly equiaxed crystals, and the middle area is columnar crystals. Although this suppresses the formation of columnar grains in the slab and makes the equiaxed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16C22F1/00
Inventor 王忠英王前
Owner JIANGSU SHAGANG GROUP HUAIGANG SPECIAL STEEL CO LTD
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