Temperature maintenance and/or possible heating apparatus for long metal products and relative method

Abstract

A temperature maintenance and / or possible heating apparatus for long products continuously cast and sheared to size by means of shearing means so as to define segments of bloom, said apparatus being disposed between a casting machine having a first casting line and a second casting line, and a rolling line disposed downstream of the casting machine in order to make long rolled metal products. The apparatus comprises: a mobile movement section of said bloom segments, disposed downstream of said shearing means and comprising a first mobile line and a second mobile line, said first and second mobile line being suitable to move transversely to the direction of advance of the bloom segments in order to move to a first position in which said mobile line and / or said second mobile line are aligned respectively with the first casting line and with the second casting line and to a second position in which one of either of said first mobile line or said second mobile line is aligned with a conveying axis; and a furnace, disposed downstream of said mobile movement section, comprising an entrance rollerway for the bloom segments aligned with said conveying axis, and an exit rollerway aligned with said rolling line and transverse transfer devices suitable to transfer the bloom segments from the entrance rollerway toward the exit rollerway.

Description

FIELD OF THE INVENTION[0001]The present invention concerns a temperature maintenance and / or possible heating apparatus for continuously cast long products and the relative method, for a casting and continuous rolling plant in semi-endless mode, to make long metal rolled products such as bars, wire rod, beams, rails or sections in general.BACKGROUND OF THE INVENTION[0002]Continuous casting plants known in the state of the art for the production of long rolled products have considerable limitations in that, for reasons intrinsically connected to operating constraints and performance of the components, their productivity does not generally exceed 25-40 ton / h.[0003]Consequently, in order to obtain higher productivity it is necessary to increase the number of casting lines connected to the same rolling line, which can be up to 8 lines or more.[0004]This entails, among other things, the need to translate the billets or blooms exiting from the various casting lines on a single entrance poi...

AI Technical Summary

Benefits of technology

[0029]The respective first and second position of the mobile movement lines are independent of each other, thus allowing to render independent of each other the casting processes of the two lines, and preventing any interruptions thereof.

[0043]According to another feature of the present invention, the optimum length of the bloom segments, and hence of the furnace that has to contain them, is chosen as a function of the reduction to a minimum of the linear combination of the heat losses in the furnace and the losses of material due to crops, short bars and cobbles.

Problems solved by technology

Continuous casting plants known in the state of the art for the production of long rolled products have considerable limitations in that, for reasons intrinsically connected to operating constraints and performance of the components, their productivity does not generally exceed 25-40 ton / h.

This entails, among other things, the need to translate the billets or blooms exiting from the various casting lines on a single entrance point of the heating furnace, with the consequent losses of temperature during the transfers.

These process necessities and limitations are the main cause of an increase in energy required for heating the billets or blooms, and of a worsening in achieving the maximum productivity, due both to the large-sized tundishes that are needed to serve several casting lines and also to the large number of billets or blooms to be processed given the same number of tons / hour to be produced, with consequent high number of crops, heads entrances into the stands of the mill and sub-lengths with non-commercial sizes.

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