Method for producing a hot rolled strip made of a steel comprising a high content of manganese

Abstract

Steel strip can be produced which in spite of its high manganese content has good deformation behaviour in that, according to the invention, from a steel which comprises more than 12 to 30 weight % of manganese, roughed strip (V) is cast close to the final dimensions in a double-roller casting machine ( 2 ), said roughed strip comprising a thickness of up to 6 mm. Following casting, this roughed strip is further processed to form continuous hot strip by preferably being rolled in a single hot roll pass.

1 . A method for producing a hot strip (W) with TWIP and TRIP characteristics from a steel which comprises more than 12 to 30 weight % of manganese, in which method a melt (S) is cast close to the final dimensions in a double-roller casting machine ( 2 ) so as to form roughed strip (V), said roughed strip (V) comprising a thickness of up to 6 mm, which roughed strip (V), following casting, is further continuously processed to form hot strip (W) by being rolled in a single hot roll pass to the final thickness of the hot strip (W).  
     
     
         2 . The method according to  claim 1 , 
 characterised in that 
 the thickness of the roughed strip is up to 4 mm, in particular up to 2.5 mm.  
   
     
     
         3 . The method according to one of the preceding claims, 
 characterised in that 
 further processing of the roughed strip to form hot strip comprises controlled cooling which takes place immediately after casting.  
   
     
     
         4 . The method according to  claim 3 , 
 characterised in that 
 cooling takes place at a rate which is accelerated when compared to cooling by exposure to ambient air.  
   
     
     
         5 . The method according to any one of the preceding claims, 
 characterised in that 
 the average initial rolling temperature (AT) at which the roughed strip enters the roll stand ( 4 ) ranges between 1100° C. and 750° C.  
   
     
     
         6 . The method according to any one of the preceding claims, 
 characterised in that 
 following hot rolling, the rolled hot strip (W) is cooled in a controlled way.  
   
     
     
         7 . The method according to any one of the preceding claims, 
 characterised in that 
 at the end of further processing, the hot strip (W) is coiled to form a coil (C).  
   
     
     
         8 . The method according to any one of the preceding claims, 
 characterised in that 
 further processing of the roughed strip to form hot strip (W), at least in sections, takes place in a protective gas atmosphere.  
   
     
     
         9 . The method according to  claim 8 , 
 characterised in that 
 the roughed strip (V) is kept in the protective gas atmosphere at least until it enters the roll stand ( 4 ).  
   
     
     
         10 . The method according to any one of the preceding claims, 
 characterised in that 
 the steel comprises up to 3.5 weight %, in particular up to 3 weight %, silicon.  
   
     
     
         11 . The method according to any one of the preceding claims, 
 characterised in that 
 the steel comprises up to 3.5 weight %, in particular up to 3 weight %, aluminium.