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Method and strand guide for supporting, guiding and cooling casting strands made of steel, especially preliminary sections for girders

A guiding device and continuous casting billet technology, applied in the field of supporting, guiding and cooling continuous casting billets, can solve problems such as surface cracking, and achieve the effect of reducing cracking and avoiding excessive cooling of the billet shell.

Inactive Publication Date: 2003-10-01
SMS DEMAG AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, surface cracking always occurs

Method used

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  • Method and strand guide for supporting, guiding and cooling casting strands made of steel, especially preliminary sections for girders
  • Method and strand guide for supporting, guiding and cooling casting strands made of steel, especially preliminary sections for girders
  • Method and strand guide for supporting, guiding and cooling casting strands made of steel, especially preliminary sections for girders

Examples

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Embodiment Construction

[0048] As an example, a continuously cast slab 1 for a rail profile blank 2 is shown ( FIGS. 1 and 1A ). After leaving the continuous casting mold 3, the strand 1 is cooled in a zero-support segment 4 by means of a secondary cooling device and then in the other segments 5, 6, 7 by means of water jets 8 and passed through a drawing The driven rollers of the blank machine 9 are pulled out.

[0049] The thicknesses of the strand shells in millimeters are shown two meters apart from one another. Length L is the total equipment length of the continuous casting slab crystallizer before the casting machine 9 . Furthermore, the radii R1, R2 and R3 determine the arc of the strand.

[0050]The continuous cast strand 1 receives a water jet 8 in the zero-support segment 4 with a width 10 equal to or greater than the length 11 of the support roll pair 12 by means of targeted temperature control. Such water jets 8 are used on the longitudinal side 13 and the lateral side 14 of the contin...

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Abstract

A method and strand guide for supporting, guiding and cooling casting strands (1) made of steel, especially preliminary sections (2) for girders, which are cooled by injected water (29) and are drawn. The inventive method prevents cracks, especially surface cracks, from appearing in the microstructure by adapting the cooling conditions of the surface of the strand during secondary cooling. Undercooling of the chill of the strand is prevented by adapting the cooling and support of the beam blank format to the solidification range in order to avoid an undesirable solidification structure on the upper flange edges or in other cross-sectional areas so that cooling and support are provided exclusively where a crater is formed. The casting strand (1) is cooled by guiding the temperature in a specific manner in upper supporting segments (5, 6, 7) by means of injected water jets whose width at least matches the length of the supporting rollers on longitudinal and transversal sides (13, 14) of the cross section (1a) of the casting strand, and is decreasingly supported in an analogous manner with respect to the length of the casting path and the cooling state in core areas (15) of the cross section (1a) of the casting strand on the transversal sides (14) of said casting strand cross section (1a) and cooling occurs exclusively by means of water jets (8) which are oriented towards said core areas (15).

Description

technical field [0001] The invention relates to a method and a strand guiding device for supporting, guiding and cooling a continuous casting billet, especially a BBL rail beam profile billet, wherein the continuous casting billet is cooled by means of a secondary cooling device in a zero sector after leaving the continuous casting mould. Cooling and further cooling by spraying water in the subsequent support segments and pulling out. Background technique [0002] From JP4200844 it is known that, in the strand guiding device, support rolls are used for the longitudinal sides of the casting cross-section, partly in the form of wing tip rolls and partly in the form of longitudinal rolls arranged on the underside of the profile . On the lateral side of the pouring cross-section, supporting rollers with corresponding lengths are provided. However, such an arrangement does not take into account the thickness of the strand shell present at the relevant strand location and the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00B22D11/124B22D11/128
CPCB22D11/009B22D11/124B22D11/1282
Inventor A·G·扎伯D·莱策尔W·米鲁斯基T·费斯特H·D·施奈德尔L·费舍尔H·布罗特斯基
Owner SMS DEMAG AG
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