DE10256751B4 - Continuous casting mold for casting strands of metals, in particular of steel materials - Google Patents

Abstract

Continuous casting mold for casting strands of metal, in particular of steel materials whose casting cross-section is bounded by plates of copper or copper alloys forming broad side plates (1) and / or narrow side plates, at least in the bath mirror region (4) on the hot side, against wear and tear Heat-formed surface is provided, characterized in that at least in the broad side plates (1) in the bath mirror region (4) a recessed, strip-shaped mold section (5) is provided, and the recessed surface receives a larger surface roughness by a blasting process

Description

The invention relates to a continuous casting mold for casting strands of metal, in particular of steel materials, whose casting cross-section is limited by plates of copper or copper alloys, the broad side plates and / or narrow side plates form, wherein an at least in the bathroom mirror area on the hot side arranged against wear and heat surface formed is provided.

Such a continuous casting mold is for example from the EP 1 099 496 A1 known. There, the heat flow between the forming strand shell and the mold inner surface is throttled by a higher heat transfer resistance to reduce the heat dissipation in the bath level range. With this measure, the risk of cracking in the strand shell is counteracted. The higher heat transfer resistance is generated by a macrotexture in the mold inner surface.

A similar design is from the EP 0 228 335 B1 known to suggest an insert of about 100 to 200 mm, which is to consist of a coating of a heat-resistant material with a lower thermal conductivity.

All these proposals have in common to solve the problem of occurring in the bathroom mirror area higher temperature stresses. Casting speeds of up to 10 m / min are the goal in particular for thin slab continuous casting plants. With increasing casting speed, the mold life decreases as a result of increasing temperature stress. In addition to the above measures, the copper plates were used to increase the tool life on the working side (hot side), e.g. coated with nickel However, the high temperature load also causes cracks in the nickel coating and the coating bursts. Coatings with oxides, carbides or other materials have also been unsuccessful. In addition, such a surface structure in the adjustment of the narrow side plates is critical, since this is changed by the narrow side plate adjustment and can lead to grooves in the adjustment of the mold and thus surface defects on the cast strand.

The invention has for its object to achieve a reduction of heat dissipation and a reduction of the copper temperature in the bath level range on the hot side of the mold plate without the adjustment of the narrow side plates leads to grooves and surface defects on Gießstrang.

The stated object is achieved in that at least in the wide side plates in the bathroom mirror area a recessed, strip-shaped mold section is provided, and the recessed surface receives a larger surface roughness by a blasting process. This causes a reduction of the heat dissipation or a reduction of the copper temperature. Due to the deeper, blasted area, there is no contact between the narrow side plate and the blasted area, which avoids grooves in the narrow side adjustment.

An improvement can be achieved by using a shot peening method as the blasting method.

According to the further invention, the recessed mold section begins at least 50 mm from the upper mold edge and ends a maximum of 250 mm from the mold top.

The blasted mold section has a depth of 0.05 to 0.3 mm. An adjustment of the narrow side plates is also possible without generating grooves against the non-blasted surface (Kokillenheißseite).

It is also advantageous that the depression has corner radii in the upper and lower regions.

Another essential measure is that the roughness of the blasted Kokillenabschnitts is a minimum of 20 microns and a maximum of 200 microns.

In the drawing, an embodiment is shown, which will be explained in more detail below.

• 1 eine Vorderansicht auf die Breitseitenplatte und
• 2 einen senkrechten Schnitt A-A durch den vertieften, streifenförmigen Kokillenabschnitt.

Show it:

• 1 a front view of the broadside plate and
• 2 a vertical section AA through the recessed, strip-shaped mold section.

Shown in the drawing, for example. A CSP continuous casting mold with a broad side plate 1 in the middle area 2 a funnel 3 to a dip tube in the middle area 2 to be able to introduce. The broadside plate 1 consists of copper or a copper alloy. In the bathroom mirror area 4 is a deeper, strip-shaped Kokillenabschnitt 5 applied by shot peening. These areas are double hatched.

The recessed mold section 5 starts at least about 50 mm from the upper edge of the mold 6 and ends at a maximum of about 250 mm from the mold top edge 6 ,

According to 2 is in the recessed mold section 5 the blasted area, preferably by shot peening, wherein the recess 7 between 0.05 to 0.3 mm. In the upper and lower well area 7a and 7b are corner radii 8th provided with adjusted sizes.

The roughness 9 of the recessed mold section 5 is a minimum of 20 μm and a maximum of 200 μm.

LIST OF REFERENCE NUMBERS

1

Broadside plate

2

mid-range

3

funnel

4

bath level

5

Kokillenabschnitt

6

chill mold

7

deepening

7a

depression area

7b

depression area

8th

Corner radii

9

roughness

Claims (6)

Continuous casting mold for casting strands of metal, in particular of steel materials whose casting cross-section is bounded by plates of copper or copper alloys which form broad side plates (1) and / or narrow side plates, one arranged at least in the bath mirror region (4) on the hot side against wear and tear Heat-formed surface is provided, characterized in that at least in the broad side plates (1) in the bath mirror region (4) a recessed, strip-shaped mold section (5) is provided, and the recessed surface receives a larger surface roughness by a blasting process Continuous casting mold after Claim 1 , characterized in that a shot peening method is used as the blasting method. Continuous casting mold according to one of the Claims 1 or 2 , characterized in that the recessed mold section (5) starts at least 50 mm from the mold upper edge (6) and ends at most 250 mm from the upper mold edge (6). Continuous casting mold according to one of the Claims 1 to 3 , characterized in that the blasted Kokillenabschnitt (5) has a depth of 0.05 to 0.3 mm. Continuous casting mold according to one of the Claims 1 to 4 , characterized in that the recess (7) in the upper and lower regions (7a, 7b) has corner radii (8). Continuous casting mold according to one of the Claims 1 to 5 , characterized in that the roughness (9) of the blasted Kokillenabschnitts (5) is a minimum of 20 microns and a maximum of 200 microns.

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