Jacket for a Roller Used in Continuous Casting, Particularly for the Production of Aluminum or Aluminum Alloy Strips and of Zinc-based Alloy Strips

Abstract

A jacket for a roller used in continuous casting. The roller includes a hardened and quenched steel base surrounded by a cladding which ensures a high mechanical strength and protects the jacket from chemical aggression from liquid metal.

Claims

1. A jacket for continuous casting rollers, comprising a hardened and quenched steel base surrounded by a cladding.

2. The jacket according to claim 1, wherein said cladding is welded onto said base.

3. The jacket according to claim l wherein said cladding is made of a material that has a high mechanical strength, hardness, resistance to abrasion together with sufficient resistance to corrosion.

4. The jacket according to claim 1, wherein said cladding is made of a martensitic stainless steel.

5. The jacket according to claim 1, wherein said cladding is applied with a method chosen among EBW (Electron Beam Welding), SAW (Submerged Arc Welding), GMAW (MIGMetal-arc Inert Gas or MAGMetal-arc Active Gas welding), SMAW (Shielded Metal Arc Welding), FCAW (Flux-Cored Arc Welding), GTAW (Gas Tungsten Arc WeldingTIG welding).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further characteristics and advantages will become better apparent from the description of preferred but not exclusive embodiments of the invention, illustrated by way of nonlimiting example in the accompanying drawings, wherein:

[0027] FIG. 1 is a perspective view of a roller for continuous casting, provided with the jacket according to the present invention;

[0028] FIG. 2 is a perspective view, enlarged with respect to the preceding one, which shows a detail of the roller;

[0029] FIG. 3 is a schematic sectional view of the jacket according to the present invention;

[0030] FIG. 4 is a view of the jacket mounted with supports in order to be subjected to machining.

DETAILED DESCRIPTION

[0031] With reference to the cited figures, the jacket according to the invention, designated generally by the reference numeral 1, is adapted to be mounted on a roller 100 which is part of a plurality of rollers of a continuous casting line, not shown in the figures, for the production of aluminum or aluminum alloy strips and of zinc-based alloy strips.

[0032] According to the present invention, the jacket 1 has a hardened and quenched steel base 2 surrounded by a cladding 3.

[0033] The cladding 3 welded over the base 2 allows a drastic reduction in the wear of the jacket.

[0034] For the cladding 3, a material is used which is particularly suitable for applications that require high mechanical strength, hardness, resistance to abrasion together with a sufficient resistance to corrosion.

[0035] The cladding can be provided by means of martensitic stainless steels and applied with various methods, such as EBW (Electron Beam Welding), SAW (Submerged Arc Welding), GMAW (MIGMetal-arc Inert Gas or MAGMetal-arc Active Gas welding), SMAW (Shielded Metal Arc Welding), FCAW (Flux-Cored Arc Welding), GTAW (Gas Tungsten Arc WeldingTIG welding).

[0036] The cladding increases the life of the jacket, allowing to replace the roller pack of the casting line, not before it has produced approximately 50,000 tons, increasing productivity.

[0037] Another feature of the present invention is that the quality of the product is kept constant throughout the life of the jacket, because of the drastic reduction of the surface defects.

[0038] In FIG. 3, which is a sectional view of the jacket 1 according to the invention, the reference numeral 2 designates the part with the base material, while the reference numeral 3 designates the part with the cladding material. In FIG. 4, the jacket 1 is shown mounted on supports 104 in order to perform its machining.

[0039] In practice it has been found that the invention achieves the intended aim and objects, providing a jacket for continuous casting rollers that allows to achieve several important advantages.

[0040] First of all, the present jacket ensures a longer life of the material.

[0041] Also, the jacket according to the present invention ensures resistance to high-temperature wear, a defect caused by oligocyclic fatigue phenomena due to thermal expansions.

[0042] Also, the present jacket allows a reduction of surface deterioration caused by liquid metal.

[0043] The present jacket allows an increase in the productivity of the casting line by virtue of the reduced maintenance and the decreased machine downtimes.

[0044] The present jacket allows an increase in the quality of the product, i.e., of the strip.

[0045] This application claims the priority of Italian Patent Application No. 102017000036965, filed on Apr. 4, 2017, the subject matter of which is incorporated herein by reference.