Method And Device For Producing Hot Metallic Strip, In Particular From Lightweight Structural Steel

Abstract

The object of the invention is to improve the quality of cast hot strips. The object is achieved in terms of the method by a method for producing hot metallic strips, in particular of lightweight structural steel, wherein a melt is charged in the presence of inert gas by means of a runner onto a circulating casting belt of a horizontal strip casting facility, solidifies to form a pre-strip with a thickness of between 6 and 20 mm and, after thorough solidification, the pre-strip undergoes a hot rolling process. The invention is characterized in that the heat transfer and the contact (surface area, time) between the strand solidified to form a pre-strip and the casting belt is reduced, and by a device for carrying out the method.

1 .- 16 . (canceled) 
   
   
       17 . A method of producing a hot metallic strip, comprising the steps of:
 charging a melt by means of a runner onto a circulating casting belt of a horizontal strip casting facility in the presence of inert gas;   allowing the melt to solidify to form a pre-strip with a thickness between 6 to 20 mm; and   causing the casting belt to locally vibrate so as to reduce a heat transfer and a contact between the solidifying melt and the casting belt.   
   
   
       18 . The method of  claim 17 , further comprising the step of subjecting the pre-strip to a hot rolling process after solidification. 
   
   
       19 . The method of  claim 17 , wherein the melt is made of lightweight structural steel. 
   
   
       20 . The method of  claim 17 , wherein the step of reducing the heat transfer includes the step of decreasing a contact area between the solidifying melt and the casting belt. 
   
   
       21 . The method of  claim 17 , wherein the step of reducing the heat transfer includes the step of decreasing a contact time between the solidifying melt and the casting belt. 
   
   
       22 . The method of  claim 17 , wherein the casting belt is excited electromagnetically. 
   
   
       23 . The method of  claim 17 , wherein the step of reducing the heat transfer includes the step of feeding a gas between the runner and the casting belt before the charging step. 
   
   
       24 . The method of  claim 23 , wherein the gas is a mixed gas of an inert gas as carrier and a reducing gas. 
   
   
       25 . The method of  claim 24 , wherein the reducing gas is hydrogen. 
   
   
       26 . A device for producing a hot metallic strip, comprising:
 a feed vessel which contains the melt and has a horizontal runner;   a primary cooling zone downstream of the feed vessel and including two deflection pulleys and a circulating cooled casting belt routed over the deflection pulleys for allowing melt, received from the runner, to solidify, said casting belt being configured with a structure;   a secondary cooling zone downstream of the primary cooling zone and including an enclosed roller table for further solidification of the melt to form a pre-strip; and   a vibratory unit arranged beneath the casting belt to cause vibrations of the casting belt.   
   
   
       27 . The device of  claim 26 , further comprising a roll stand for subjecting the pre-strip to a rolling process. 
   
   
       28 . The device of  claim 26 , wherein the melt is made of lightweight structural steel. 
   
   
       29 . The device of  claim 26 , wherein the casting belt is defined by a longitudinal axis, said structure being realized by embossments extending in a direction of the longitudinal axis. 
   
   
       30 . The device of  claim 26 , wherein the structure is realized by providing nubs distributed across a surface of the casting belt. 
   
   
       31 . The device of  claim 26 , wherein the vibratory unit is an electromagnetically vibratory unit. 
   
   
       32 . The device of  claim 31 , wherein the electromagnetic vibratory unit arranged in a region in which the pre-strip forms a solid casting shell. 
   
   
       33 . The device of  claim 26 , further comprising a hollow body arranged in a region of a leading one of the defection pulleys beneath the runner transversely to the casting belt, said hollow body having a broad slit for connection with a gas feed line. 
   
   
       34 . The device of  claim 33 , wherein the hollow body extends across an entire width of the casting belt. 
   
   
       35 . The device of  claim 33 , further comprising a seal arranged beneath a discharge zone of the hollow body and connected with the hollow body, said seal resting upon the casting belt. 
   
   
       36 . The device of  claim 35 , wherein the seal is a brush.