Method and device for pretreating a rolled piece before hot rolling

A technology of pretreatment and rolling, which is applied in the maintenance of heat treatment furnaces, heat treatment equipment, heating chambers, etc., can solve the problems of difficult removal of oxide skin and no disclosure, achieve good temperature changes, reduce the burden of nitrogen oxides, and increase energy Delivery effect

CN103582708AInactive Publication Date: 2014-02-12PRIMETALS TECH AUSTRIA GMBH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-02-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method and a device for pretreating a rolled good (3). The aim of the invention is to find a method and a device with which the rolled good (3) can be both energy-efficiently heated and thoroughly descaled before hot rolling. Said problem is solved by the following method steps: preheating the rolled good (3) in a preheating furnace (4) by a plurality of burners (11); descaling the preheated rolled good (3) in a descaling device (5); heating the descaled rolled good (3) in a heating furnace by means of a plurality of burners (11), wherein the burners substoichiometrically burn a carbon carrier so that the rolled good (3) is held in a reducing atmosphere in the heating furnace (7) by the exhaust (12, 13) created during combustion; introducing a first part of the exhaust (12) and oxygen (15) into the preheating furnace (4); post-combusting the first part of the exhaust (12) in the preheating furnace (4), wherein the volume of oxygen (15) is chosen so that the rolled good (3) is held in an oxidizing atmosphere in the preheating furnace (4).
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Description

technical field

[0001] The invention relates to a method and a device for pretreatment of rolling stock made of steel prior to hot rolling. Background technique

[0002] JP 63-262417 A discloses a method for heating slabs (Bramme) in a multi-part furnace, wherein the slabs are preheated by means of burners in the preheating zone of the furnace and subsequently heated in the furnace's The heating is carried out in a reducing atmosphere in the heating zone. The exhaust gases from the heating zone are fed to burners in the preheating zone of the furnace, where the unburned CO of the exhaust gases are post-combusted by the burners. A disadvantage of this method is that the slab must be descaled either before or after heating. The disadvantage of descaling before heating is that the scale can be difficult to remove due to the slow growth; the disadvantage of descaling after heating is that the rolled piece must be heated to a higher temperature than the rolling temperature and ...

Examples

Embodiment Construction

[0034] exist figure 1 A device for the pretreatment (aufbereiten) of the rolled stock is shown in . After pre-rolling in a two-stand pre-rolling mill 1 , the rolling stock formed as an intermediate strip (Zwischenband) 3 is conveyed along the transport direction 10 to a preheating furnace 4 where it is heated by a plurality of oxygen burners 11 . Preheat to a temperature of 1050°C. In this case, the oxygen burner 11 burns gas-fired methane with the addition of technically pure oxygen. In addition, a first part 12 and a second part 13 of the exhaust gas of the downstream heating furnace 7 are post-combusted in the preheating furnace 4 . After preheating, the rolling stock 3 is descaled in a descaling device 5 configured as a rotary descaling device, wherein the rolling stock is cooled to 980° C. The rolling stock is then conveyed to the induction furnace 6 and heated there by 5 induction modules. The rolling stock 4 is subsequently heated in the heating furnace 7 to a rolli...