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Bloom continuous-casting dynamic gentle pressure amount control method-

A control method and reduction technology, applied in the field of bloom continuous casting light reduction process, can solve the problems of reduced welding performance, reduced drawing performance, looseness, etc., and achieve the effect of reducing center segregation

Inactive Publication Date: 2009-02-11
PANGANG GROUP RESEARCH INSTITUTE CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Central segregation and porosity will seriously affect the performance of steel and cause a series of quality problems: for high-carbon wire rods, central porosity and segregation will lead to reduced drawability and increased breakage rate; for natural gas pipeline steel, hydrogen diffusion to segregation, In the loose part, cracks will be generated and expanded, which will eventually lead to the rupture of the pipe; for structural steel used in offshore drilling and platforms, the loose center and segregation will reduce its welding performance, and it is not suitable for welding, or even cracked.
In addition, No. 01122537.8 invention patent discloses a light reduction process and equipment, in which the control range of the reduction is 5-20 mm, but due to different steel types, the volume shrinkage rate when the molten steel solidifies, The average liquid phase fraction and so on have changes, so inaccurate reduction control is prone to occur in actual production, which still causes defects such as segregation and porosity in the center of the bloom

Method used

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  • Bloom continuous-casting dynamic gentle pressure amount control method-
  • Bloom continuous-casting dynamic gentle pressure amount control method-
  • Bloom continuous-casting dynamic gentle pressure amount control method-

Examples

Experimental program
Comparison scheme
Effect test

Embodiment ( 1

[0080] (1) Casting machine equipment parameters: full arc bloom continuous casting machine, radius 15m, diameter of casting rolls in arc section 220mm, center distance between adjacent casting rolls 210mm, diameter of casting rolls in straightening section and horizontal section 450mm, adjacent casting rolls Roll center spacing 1500mm.

[0081] (2) The slab size is 360mm×450mm, the steel grade is YQ450NQR1, the continuous casting speed is 0.50m / min, the superheat degree is 20~35℃, the continuous casting cooling strength is 0.332L / kg, and the steel grade composition is shown in Table 1.

[0082] Table 1

[0083] C Si Mn P S 0.11～0.14 0.30～0.50 1.25～1.40 0.008～0.022 0.005～0.015

[0084] (3) In the two-phase region at the end of solidification, light reduction is performed within the solid phase ratio fs=0.5-0.7, the reduction amount is 4.50 mm, and the set value of each pair of reduction rollers is shown in Table 2.

[0085] ...

Embodiment ( 2

[0089] (1) The parameters of the casting machine equipment are as in Example (1).

[0090] (2) The slab size is 360mm×450mm, and the steel grade is 45 # , the continuous casting speed is 0.65m / min, the superheat degree is 20~35℃, the continuous casting cooling strength is 0.369L / kg, and the steel grade composition is shown in Table 3.

[0091] table 3

[0092] C Si Mn P S 0.42～0.50 0.17～0.37 0.50～0.80 0.010～0.025 0.008～0.020

[0093] (3) In the two-phase zone at the end of solidification, light reduction is performed within the fs=solid phase ratio of 0.5 to 0.8, and the reduction amount is 6.40 mm. The setting values ​​of each pair of reduction rollers are shown in Table 4.

[0094] Table 4

[0095] Gently press down on the rack number 1 # 2 # 3 # 4 # 5 # 6 # 7 # Set value of pressing amount / mm 0 1.85 2.02 1.44 1.09 0 0

[0096] (4) The central segregation rating of th...

Embodiment ( 3

[0098] (1) The parameters of the casting machine equipment are as in Example (1).

[0099] (2) The slab size is 360mm×450mm, the steel grade is 20(C), the continuous casting speed is 0.80m / min, the superheat degree is 20~35℃, the continuous casting cooling strength is 0.416L / kg, and the steel grade composition is shown in Table 5. .

[0100] table 5

[0101] C Si Mn P S 0.17～0.23 0.17～0.37 0.35—0.65 0.010～0.025 0.008～0.020

[0102] (3) Light reduction is performed within the solid phase ratio of 0.5 to 0.9 in the two-phase zone at the end of solidification, and the reduction amount is 7.72 mm. The setting values ​​of each pair of reduction rollers are shown in Table 6.

[0103] Table 6

[0104] Gently press down on the rack number 1 # 2 # 3 # 4 # 5 # 6 # 7 # Set value of pressing amount / mm 0 1.15 1.36 1.86 1.58 1.04 0.73

[0105] (4) The central segregation rating of...

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Abstract

The invention discloses a bloom continuous casting soft depressing technology in steel production and more particularly relates to a control method of the depressing quantity of the bloom continuous casting soft depressing. The invention aims at solving the technical problem of providing a control method which can determine the depressing quantity of the bloom continuous casting dynamic soft depressing according to different steel grades and obtaining the depressing quantity Delta S by adopting the following method (see the formula). The adoption of the control method of the depressing quantity can determine the depressing quantity of the dynamic soft depressing needed in different conditions of the continuous casting technology rapidly and effectively according to changes of the steel grades, and obviously reduce the central segregation of casting billets as well as reducing or even eliminating the appearance of central crack and central porosity.

Description

technical field [0001] The invention relates to a light reduction process of bloom continuous casting in iron and steel production, in particular to a method for controlling the reduction amount of bloom continuous casting with light reduction. Background technique [0002] Generally, the billet with the cross-sectional dimension of the casting billet larger than 200mm × 200mm is called a bloom. During the solidification process of the slab, the segregated crystallization characteristics of molten steel inevitably lead to the enrichment of solute elements in the intergranular liquid phase, such as C, S, P, etc. At the same time, the continuous growth of the billet shell makes the molten steel enriched with solute elements continuously move to the vicinity of the center of the billet; the molten steel at the center of the solidification end of the billet is rich in solute elements, and its fluidity decreases. The molten steel in the central part gradually transforms into a s...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D11/12
Inventor 陈永朱苗勇杨素波祭程罗森吴国荣曾建华
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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