Continuous Casting and Rolling Plant for a Metal Strip, Production Method for a Metal Strip, and a Metal Strip Itself

Abstract

A continuous casting and rolling installation for a metal strip comprises a casting device, a hot-rolling device mounted downstream thereof, and a cooling section mounted downstream of the hot-rolling device. Liquid metal is cast in the casting device to give a metal strip having an initial thickness. The cast metal strip is fed to a hot rolling device immediately after casting with an initial thickness and is hot-rolled. The hot-rolled metal strip is then cooled with a coolant in the cooling section. The continuous casting and rolling installation comprises a housing which surrounds the casting device, the hot rolling device and the cooling section and which can be flooded with a protective gas. The invention allows to guide the metal strip in a housing flooded with a protective gas at least from emergence from the casting device until emergence from the cooling section.

1 .- 21 . (canceled)  
   
   
       22 . A continuous casting and rolling plant for a metal strip, comprising: 
 a casting device that casts an a metal strip having an initial thickness;    a hot-rolling device arranged downstream of the casting device to hot roll the metal strip;    a cooling section arranged downstream of the hot-rolling device that cools the hot rolled metal strip via a coolant; and    a housing surrounding the casting device, hot-rolling device, and cooling section that maintains a flooded protective gas environment throughout an interior space of the housing.    
   
   
       23 . The continuous casting and rolling plant as claimed in  claim 22 , wherein 
 the metal strip initial thickness is at most 10 mm.    
   
   
       24 . The continuous casting and rolling plant as claimed in  claim 23 , wherein the casting device is a two-roller casting device.  
   
   
       25 . The continuous casting and rolling plant as claimed in  claim 24 , wherein the hot-rolling device has at most two roll stands.  
   
   
       26 . The continuous casting and rolling plant as claimed in  claim 25 , wherein the cooling section has a feeder device for feeding an additional substance counteracting scaling into the coolant.  
   
   
       27 . The continuous casting and rolling plant as claimed in  claim 26 , further comprising a reeling device is arranged downstream of the cooling section.  
   
   
       28 . The continuous casting and rolling plant as claimed in  claim 27 , wherein the reeling device has a reel and one shearing device.  
   
   
       29 . The continuous casting and rolling plant as claimed in  claim 28 , wherein the reeling device is located outside the housing.  
   
   
       30 . The continuous casting and rolling plant as claimed in  claim 29 , wherein a cold-rolling device is arranged downstream of the cooling section.  
   
   
       31 . The continuous casting and rolling plant as claimed in  claim 30 , wherein the cold-rolling device is arranged between the cooling section and reeling device.  
   
   
       32 . The continuous casting and rolling plant as claimed in  claim 31 , wherein the cold-rolling device is located inside the housing.  
   
   
       33 . The continuous casting and rolling plant as claimed in  claim 32 , wherein the cold-rolling device has at most two roll stands.  
   
   
       34 . The continuous casting and rolling plant as claimed in  claim 33 , wherein there is no descaling device located between the hot-rolling device and cold-rolling device.  
   
   
       35 . A production method for a metal strip, comprising: 
 casting a liquid metal in a casting device to produce a metal strip having an initial thickness;    providing the cast metal strip with initial thickness immediately after casting to a a hot-rolling device;    hot rolling the provided cast metal strip with initial thickness to produce a hot rolled metal strip;    cooling the hot rolled metal strip in a cooling section via a coolant, wherein at least from where it exits the casting device to where it exits the cooling section, the metal strip is ducted in a housing flooded with a protective gas.    
   
   
       36 . The production method as claimed in  claim 35 , wherein the initial thickness is at most 10 mm.  
   
   
       37 . The production method as claimed in  claim 36 , wherein the protective gas is selected from the group consisting of: nebulized water, nitrogen, argon, and combinations thereof.  
   
   
       38 . The production method as claimed in  claim 37 , wherein an additional, oxygen-depleting substance is admixed with the protective gas.  
   
   
       39 . The production method as claimed in  claim 38 , wherein the additional substance is selected from the group consisting of: carbon monoxide, salt, and combinations thereof.  
   
   
       40 . The production method as claimed in  claim 39 , wherein an additional substance counteracting scaling is admixed with the coolant.  
   
   
       41 . The production method as claimed in  claim 40 , wherein the metal strip is not descaled between hot rolling and cold rolling.