Control method of natural roll-gap thermal-contraction technique based on bloom

A control method and thermal shrinkage technology, applied in the field of billet continuous casting roll gap technology, to achieve the effect of improving center segregation and center porosity

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

[0005] At present, there is no technical report on controlling the roll gap through the heat shrinkage value of the slab, setting a reasonable roll gap process system and improving the internal quality of the slab by setting the taper value of the roll gap and the value of the reduction rate of the roll gap.

Method used

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  • Control method of natural roll-gap thermal-contraction technique based on bloom
  • Control method of natural roll-gap thermal-contraction technique based on bloom
  • Control method of natural roll-gap thermal-contraction technique based on bloom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment ( 1

[0048] (1) Casting machine equipment parameters: full arc-shaped bloom continuous caster, radius 15m, arc section casting roll diameter 220mm, center distance between adjacent casting rolls 210mm, straightening section and horizontal section casting roll diameter 450mm, length of pressing section It is 9200mm, and the distance between the centers of adjacent casting rolls is 1500mm.

[0049] (2) The billet size is 360mm×450mm, the steel type is YQ450NQR1, the continuous casting casting speed is 0.4-0.6m / min, the degree of superheat is 20-35°C, and the continuous casting cooling intensity is 0.321-0.375L / kg. The composition of the steel type is shown in the table 1.

[0050] Table 1

[0051] 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

[0052] (3) The roll gap setting of each cooling zone is shown in Table 2.

[0053] Table 2

[0054]

[0055] (4) The roll gap taper and roll ...

Embodiment ( 2

[0060] (1) The parameters of the casting machine equipment are as in Example (1).

[0061] (2) The billet size is 360mm×450mm, and the steel type is 45 # , the continuous casting casting speed is 0.4-0.8m / min, the degree of superheat is 20-35°C, the continuous casting cooling intensity is 0.373-0.405L / kg, and the steel composition is shown in Table 4.

[0062] Table 4

[0063] 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

[0064] (3) The roll gap setting of each cooling zone is shown in Table 5.

[0065] table 5

[0066]

[0067] (4) The roll gap taper and roll gap reduction rate in each cooling zone are shown in Table 6.

[0068] Table 6

[0069] Each cooling zone zone 1 Zone 2 District 3 Air cooling area Taper value (%) 0.093 0.064 0.036 0.027 Roll gap reduction rate (mm / min) 1.3 0.9 0.47 0.39

[0070] (5) The dimensi...

Embodiment ( 3

[0072] (1) The parameters of the casting machine equipment are as in Example (1).

[0073] (2) The billet size is 360mm×450mm, the steel type is 20(C), the casting speed is 0.4~0.7m / min, the superheat is 20~35℃, the continuous casting cooling intensity is 0.415~0.432L / kg, the steel type The ingredients are shown in Table 7.

[0074] Table 7

[0075] 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

[0076] (3) The roll gap setting of each cooling zone is shown in Table 8.

[0077] Table 8

[0078]

[0079] (4) The roll gap taper and roll gap reduction rate in each cooling zone are shown in Table 9.

[0080] Table 9

[0081] Each cooling zone zone 1 Zone 2 District 3 Air cooling area Taper value (%) 0.11 0.069 0.037 0.025 Roll gap reduction rate (mm / min) 0.9 0.72 0.43 0.36

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Abstract

The invention discloses a billet continuous casting roll gap technology in metallurgical production and more particularly relates to a control method based on the technology of bloom natural thermal contraction roll gaps. The control process provided by the invention for controlling the roll gaps by the thermal contraction values of casting billets includes the following steps of: (1) the calculation of real-time temperature fields: building a solidification and heat transfer model of casting billets to obtain temperature fields of different times; (2) thermal coupling calculation: obtaining the natural thermal contraction values of casting billets in the direction of the casting billets at different times according to corresponding calculated temperature fields and strain distribution of the casting billets; (3) calculation verification and field feedback: comparing with the actual situations of fields according to results calculated by simulation; and (4) the determination of the system of the roll gap technology: determining the decrease rate and the roll gap difficulty of the roll gaps. The adoption of the control method of the process can effectively avoid the off-square of the casting billets, reduce the billet-drawing resistance and improve the interior defects of the casting billets, such as the central segregation and central porosity, etc.

Description

technical field [0001] The invention relates to a billet continuous casting roll gap technology in metallurgical production, in particular to a control method based on the large billet natural heat shrinkage roll gap technology. Background technique [0002] The bloom continuous casting machine with the billet cross-sectional size greater than 200mm×200mm mainly casts high-quality steel and alloy steel for rolling high-strength section steel, channel steel, angle steel, wire rod, round steel and seamless steel pipe, etc. Steel grades that are more stringent than required. Due to the large section of the slab, bulging deformation, bending deformation and center segregation are prone to occur during the casting process, resulting in surface defects and internal defects of the slab. When the setting value of the roll gap process is greater than the actual slab thickness, it will cause bulging in the direction of the wide surface, especially at the end of solidification. This b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
Inventor 陈永朱苗勇杨素波祭程曹学欠吴国荣曾建华
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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