SU855361A1 - Rider of heating furnace - Google Patents

Description

(54) REUTER HEATING-CURRENT OVEN

I

The invention relates to ferrous metallurgy, in particular, to the design of a Reiter heating furnace, and can be used to heat slabs in heating furnaces.

A famous rider mounted on a water-cooled pipe, containing a heat-resistant trapezoidal insert 1.

A disadvantage of the known construction is the use of a heat-resistant material, which includes deficient materials, and its workability is poor - the material is not welded, it is difficult to machining with great difficulty.

Also known Reiter heating furnace, comprising a housing with a heat-resistant insert 2.

The disadvantage of such a construction of a rider is the low service life, as well as the high cost of its materials.

The purpose of the invention is to increase the life of the rater.

The goal is achieved by the fact that the insert is provided with ceramic rods installed in parallel to it, the upper ends of which are located in the same plane with the bearing surface of the insert. The rods are made of alumina.

FIG. 1 shows the proposed rater, general view; in fig. 2 is a section A-A in FIG. one.

K, the tube 1 is welded to the housing 2, into which are inserted two parts of the insert Reiter 3 and 4 of a heat-resistant metal, for example, a low-alloyed nickel-chromium-alloy 4X25H20C2. Inside the inserts are ceramic rods 5, made of

10 alumina, the ends of which come to the surface of the insert. Between the bearing surfaces of the parts of the Reiter 3, 4 insert and the bottom of the nest 2 a layer of powdered graphite is saturated. The height of both parts of the rater insert is selected based on the condition of the allowable temperature of the metal on the surface of contact with the slab. Due to the presence in the insert of ceramic rods with low thermal conductivity, the ends of which come to the surface in contact with the slab,

20 average integral surface temperature above the temperature of the metal insert. This allows you to increase the duration of the metal, as well as transfer part of the load from the slab to the ceramic rods, because the dense ceramic works well for compression (for ISOOC kg / mm). The small diametral size of the ceramic rods (10-12 mm) makes it possible to reduce the thermal stresses in them.

The proposed raiter design makes it possible to virtually eliminate the underheating of the slab in the zone of contact with the rider, which significantly affects the accuracy of the rolled product, especially the thin sheet.

The application of this design, while maintaining the average integral 1250 ° C, on the metal of a rider can be 1100-1150 ° C. At the same time, the length of the rater's work is increased by at least 1 year (from the operating experience of the raters at NLMZ).

Instead of six replacements of raters, only one per year is required.

Claims (2)

1.Rater heating furnace, comprising a housing with a heat-resistant insert, The upper end of which forms a support surface, characterized in that, in order to increase the service life of the rater, the insert is provided with ceramic rods installed in it, the upper ends of which are located in the same plane with the support surface of the insert. 2. A rater according to claim 1, wherein the rods are made of alumina. Sources of information taken into account in the examination 1. Express information “Application of raters in heating furnaces abroad. Seri 13, issue number b, Chermetinformation, 1976, p. 8-9. 2. USSR author's certificate for application number 2665143, cl. F 27 B 9/20, 1977. ///////////////////////// Л A-A FIG. g