Round billet continuous casting method and round billet continuous casting system

A round billet continuous casting and round billet technology, applied in the field of round billet continuous casting and round billet continuous casting systems, can solve the problems of low strength, bulging, billet shell creep, etc., to reduce thermal stress, reduce center segregation, The effect of slowing down the solidification rate

Inactive Publication Date: 2012-12-26
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the continuous casting cooling intensity is insufficient, the solidified slab shell will be thin, resulting in low strength of the slab at high temperature, causing the slab shell to creep and cause bulging

Method used

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  • Round billet continuous casting method and round billet continuous casting system
  • Round billet continuous casting method and round billet continuous casting system
  • Round billet continuous casting method and round billet continuous casting system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Use 34CrMo4 continuous casting round tube billet with a diameter of 430mm. Among them, the size of the upper opening of the tubular round billet crystallizer is 443mm, the lower opening is 440mm, and the length is 700mm; in the secondary cooling zone, the first spray cooling section 4, the second spray cooling section 5, the third spray cooling section 6, The lengths of the fourth spray cooling section 7 and the fifth spray cooling section 8 are 0.35m, 0.4m, 0.4m, 2.0m and 3.0m respectively; the width of each spray cooling section is the same, both are 430mm. The composition of 34CrMo4 is shown in Table 1.

[0034] Table 1

[0035]

[0036] During continuous casting: the pouring temperature is 1560°C; the casting speed is V c 0.2m / min. The cooling intensity of each spray section is determined according to the round slab continuous casting method of the present invention and after error adjustment is carried out within a reasonable range, the slab cooling intensity...

Embodiment 2

[0043] Adopt the method of embodiment 1 to cast circular tube billet continuously.

[0044] During continuous casting: the pouring temperature is 1550°C; the casting speed is V c It is 0.4m / min.

[0045] The cooling intensity of each spray section is determined according to the round slab continuous casting method of the present invention and after error adjustment is carried out within a reasonable range, the slab cooling intensity on the unit area of ​​each spray cooling section is as table 3 (in table 3 Values ​​are shown as rounded integers).

[0046] table 3

[0047]

[0048] In addition, after the numerical values ​​in Table 2 are calculated and obtained according to the method of the present invention, error adjustment can be performed according to the actual situation of the equipment. Specifically, the error of each spray cooling section is ±6, for example: the error of the first spray cooling section 4 is ±1, the error of the second spray cooling section 5 is ±...

Embodiment 3

[0052] Adopt the method of embodiment 1 to cast circular tube billet continuously.

[0053] During continuous casting: the pouring temperature is 1540°C; the casting speed is V c It is 0.7m / min.

[0054] The cooling intensity of each spray section is determined according to the round slab continuous casting method of the present invention and after error adjustment is carried out within a reasonable range, the slab cooling intensity per unit area of ​​each spray cooling section is as table 4 (in table 4 Values ​​are shown as rounded integers).

[0055] Table 4

[0056]

[0057] In addition, after the numerical values ​​in Table 2 are calculated and obtained according to the method of the present invention, error adjustment can be performed according to the actual situation of the equipment. Specifically, the error of each spray cooling section is ±6, for example: the error of the first spray cooling section 4 is ±1, the error of the second spray cooling section 5 is ±6, ...

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Abstract

The invention provides a round billet continuous casting method. The method comprises the following steps of: casting molten steel to a tubular round billet crystallizer from a tundish to form a casting billet which is not completely solidified; and then pulling the casting billet which is not completely solidified out of the tubular crystallizer at a pulling speed Vc and passing the casting billet which is not completely solidified through a secondary cooling region and an air cooling region in sequence to finally obtain a completely solidified casting billet, wherein five spray cooling sections which are arranged in sequence are used for performing secondary cooling at the secondary cooling region; and casting billet cooling strength (L / (min.m<2>)) at a unit area of each of the five spray cooling sections is shown in the specification respectively. The invention also provides a round billet continuous casting system. By determining the casting billet cooling strength at the unit area of different spray sections arranged in continuous casting direction according to the pulling speed, a continuous casting billet shell can be uniformly cooled during solidification, cooling and gradual thickening of the billet shell, so that internal defects of central cracks produced by a large round pipe billet and the like are prevented.

Description

technical field [0001] The invention relates to a round billet continuous casting method and a round billet continuous casting system. Background technique [0002] The quality of round billets plays a key role in the production of seamless steel pipes, and round billets are usually produced by continuous casting of round billets. The internal quality of the continuous casting round billet directly affects the quality of the steel pipe and the yield of the rolled pipe. Especially when there are internal defects such as central cracks in the continuous casting round billet, it is very easy to cause internal folding (that is, there are overlapping layers on the inner surface of the steel pipe) defects when the round billet passes through the pipe. If the central crack of the continuous casting slab can be eliminated, the folding defects in the rolled tube will be significantly reduced or even eliminated, and the yield of the rolled tube can be greatly improved. [0003] Duri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/22
Inventor 陈永吴国荣曾建华赵代琼
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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